At compressor terminals, voltage must be 10% of nameplate marking when unit is operating. Liquid line restriction. Check for broken Wires, loose connectors, or miswired compressor. (The OLD furnace was a house of horrors and was installed in a keystone cops sort of way- careless.) Following Hurricane Laura I had to change the circuit board and fuses. Add filter drier. RESULT: The ICC detects four (4) consecutive protector trips have occurred and the average run time for each trip is less than 15 seconds.FIX: Bad run capacitor. Would highly recommendTwintech! I have replaced the high limit and the blower motor limit switches. Should be approximately 400 CFM per ton. Excessive refrigerant in compressor. Please enter the name by which you would like to log-in and be known on this site. (Settings - About phone - State). Trying to troubleshoot an issue on my AC unit (RAPL-036JEZ). RESULT: Compressor limit has opened four (4) times within a call for operation.FIX: Outdoor coil is dirty (cooling mode). ICC alternately flashes L and 21, 27 Low Line Voltage or No Line Voltage Fault, Check incoming line voltage to the disconnect and unit, 29 High Pressure Control Open The ICC detects the HPC is open, L29 Active Protection High Pressure Control Trip, LPC has opened 3 times in the same cooling operation, the ICC has locked out the compressor to protect it. WebEcoNet and Flash Codes Inverter Product T905_O Inverter Fault DC Bus Undervoltage DC Bus voltage has dropped below acceptable voltage DC Bus Voltage <175 VDC Incoming Voltage should be greater than 187 VAC. However, some of the typical problems are not that serious and don't require much more than basic skills. A healthy heat exchanger thermistor should have a resistance between 4k to 10k Ohms. RESULT: Test Mod.FIX: The ICC is in TEST mode. Mas Broto is also a blogger, who's dedicated to bringing you the best knowledge to get ahead in the game of life. If the flame sensor is dirty, clean the sensor. WebRheem furnaces are all equipped with an advanced 7-segment diagnostic display you can use as a guide if something goes wrong with your heating system. Replace the sensor. Please note that the content may slightly differ depending on models. Check compressor windings for continuity. I checked the condenser unit and found the 7-segment LED display diagnostic code L23, this code refers to a High Pressure Control lockout. Years of experience in the HVAC field have taught him many lessons, not the least of which is that the value of quality and knowledge far exceeds any promised initial savings. Check the blower motor. ICC alternately flashes L and 21. Goodman Furnace Wont Ignite How to Solve It? I wanted to list the Rheem furnace error codes with some guidance on what the possible underlying issues could be to make these errors appear. Please enter a valid email address for yourself. This page provides a simple explanation concerning content relating to error codes and their possible causes. Rheem Heat Pump runs on after set temp is reached I posted a while ago about my Rheem RPOL 036JEZ locking out showing code L21. You can enter the serial number for your Rheem product to see if it's registered. Record the "Evaporation Temperature" from the Suction pressure gauge. Below, I will break down the reasons behind this water heater issue. d3 Airflow CFM Mismatch The indoor air mover (air handler/fumace) cannot supply the required airflow for proper system operation. Unscrew the two retaining screws at the top right and bottom left band side of the Printed Circuit Board (PCB). Rheem and York give you a simple error code that you can use for diagnostics of your furnace problems. To enter FAULT RECALL mode press both TEST and SW2 buttons at the same time with insulated probes for 1 second and release. Check wiring connections. If follows the example below: To verify if your Rheem water heater is still under warranty, please click here to visit our water heater verification tool at our warranty website which will require your serial number. gxsalas, I am having this same exact problem with the same Rheem unit, RPQL024JEZ. Continue with Recommended Cookies, You wake up from the bed, go to your washroom, and turn on the hot water faucet. A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. Friedrich air conditioner troubleshooting, Status/Possible Cause Troubleshooting Information, c Anti-short cycle timer (3 minutes) or Minimum run timer (30 seconds) active. Low line voltage. Normal Sub-Cooling = 3 - 12 deg. When posting in certain forums, knowing your location will help others give better feedback/advice/solutions to your questions. Please report the article inaccuracies, grammatical errors, etc. A clogged air inlet filter, dirty heat exchanger fins, and bad heat exchanger thermistor are some culprits behind this issue. Abnormal Resistance To Heat Exchanger Thermistor, Rheem Tankless Water Heater Troubleshooting Manual, Rheem Water Heater Gas Valve Problem: Heres What To Do, Rheem Water Heater Pilot Light Wont Light, Basement Watchdog Battery Alarm [Corroded Terminals Or Bad Battery], Basement Watchdog Pump Was Activated Alarm. Check for correct voltage at compressor. Thank you Twintech! Previous owner riged the water sofner to the A/C disconnect, it is out now I am in the process of connecting a sub-panel to provide a proper connection for the water sofner and the additional lighting and recepticals I am in the process of adding. Five Stars. Please contact us today for all of your HVAC needs in NYC. That did seem to solve the lock out problem but it has not been very cold here lately. How Many Tons is my Trane Air Conditioner? Rheem RPNL / RPQL - Low Pressure - Code L21 - Cooling, Cooling - Low Pressure Lockout - Code L21. read more Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. Dirty indoor coil or filter (heating mode). The top and bottom segments of the 7-segment display will be activated and flash to indicate the history has been cleared. Replace TXV. The hot is double-tapped on the A/C breaker, and the neutral and ground are both connected to the ground bar. RESULT: NThe indoor air mover (air handler/furnace) cannot supply the required airflow for proper system operation.FIX: Misapplied wrong indoor air mover-replace With properly sized air handler/furnace. I am not sure they work 100% but some research on the web may help and advice from electricians. Expansion valve is not operating correctly. FIX: Check incoming line voltage to the disconnect High head-high or normal vapor pressure Heating mode. Check for recirculation from other equipment. I have a whole home surge protector installed by Progress Energy (at the meter). Helping You to Do It Yourself! Each fault is displayed one time with the top segment of the 7-segment display activated between faults . Check control for proper system operation. RESULT: A command for compressor operation is present but no current is measured to the compressor.FIX: Motor protector open. Check unit placement If the outdoor unit is in a high temperature area, wait until the ambient temperature drops and check sensor reading. We have been shopping for a heat pump for our home. Means your eco has tripped. Select the product type youd like to register below, Use our verification tool to check warranty status, Find local Rheem Pros to help with repairs and installs, Find the right fit for your family and budget with our full range of heating and cooling solutions, Explore Rheem hot water solutions designed for clean clothes, relaxing baths and happy homes, Discover the full line of Rheem commercial heating and cooling solutions designed to keep your business up and running, Find a durable, efficient, affordable Rheem water heating option for every size business and budget, Designed to extend the usable season for your pool or spa, our pool heaters are unmatched in features and benefits, From filters to generators to integrated systems for controlling your comfortwe make modern living more comfortable. They dont use flashing LED light sequences to indicate errors, like other brands. RESULT: Active Protection, Low Pressure Control Trip. CODE: 10 PROBLEM: There's a one-hour lockout in place. The installation was completed by the twin owners in about 6-7 hours. If molded case circuit breakers or earth leakage circuit breakers have tripped, do not reset the breaker immediately without first checking for any problems with insulation of equipment. Looks nice and new furnace is working great. A young man by the name of Mitch came by tonight and he was so nice explained everything he was quick he was clean he turned off the lights even when he left the furnace room its just above and beyond Twin Tech always delivers and I just found out about them last year and I will use no one else but thanks again Mitch you are fantastic. So 1/4" measures 1/4" outside dimension. Clean quiet easy going didn't mind when I poked my head in to see progress. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. RESULT: Unit has received a command for second stage cooling.FIX: Normal operation. conditioner by entering the error code. But if your line set is over 25 feet you need to go larger. ICC alternately flashes L and 21. The ICC detects the HPC is open.FIX: Outdoor coil is dirty (cooling mode). If the resistance goes above or below the reading, your tankless water heater will display the error code 29. Follow the below steps to learn how to replace PCB on a Rheem tankless water heater. 7-Segment Display Codes: 0: Standby: No call for operation: c: Call on Y1: 1st Stage Unit Operation: C: Call on Y2: 2nd Stage Unit Operation: d: Defrost: Unit is in Defrost Mode: d (flash) Abnormal Defrost: F: ICC Fuse Open: Low voltage short: 21: Low pressure trip (auto reset) L21: Low Pressure Lockout (hard lockout) 23: High Pressure RESULT: High Pressure Control Trip.FIX: LPC has opened 3 times in the same cooling operation, the ICC has locked out the compressor to protect it. Early VSODU firmware (Before VSODU Rev 57) may not properly reset this fault. Display Codes L21 flashing Diagnostic Description Active Safety, Low Pressure Control Trip. Check thermostat location in zone.. Needless to say; how uncomfortable it is if you get no hot water heater on an ice-cold day in winter. Check the Return Air Temperature at the air handler or furnace. The work Greg did was HIGHLY PROFESSIONAL and FAR MORE FUNCTIONAL than what I had. Dozens of error codes have been used by Rheem over the years, which is why it's necessary to refer to your owner's manual for specific error code meanings and how to address them. 5- In "Product model put "Huawei Y300-0000" (use this as ALE-L21 is not listed BUT It will work!) In the troubleshooting manual, Rheem says that error code 29 stands for too low heat exchanger outlet temperature. WebPlant Line Code 01234 Consective Serial Number To verify if your Rheem water heater is still under warranty, please click here to visit our water heater verification tool at our warranty website which will require your serial number. Rheem furnaces are designed with an advanced 7-segment diagnostic display. evacuate & recharge. If the resistance of the heat exchanger thermistor is normal (4k to 10K ohms) but the water heater shows the error code 29, I assure you that the PCB is bad. 119 Christopher St #53, New York, NY 10014. The experience with Twintech was great from the start. Have the installer change the breaker to a 30 amp instead of that 40 amp while he's there and fix the wiring problem McSteve pointed out. Many modern furnaces have an LED light that will either be flashing or just showing some codes. ICC alternately flashes L and 21. Rheem Heat Pump: RPNE Re: Diagnostic Codes / Fault Codes The defrost board uses two LEDs for diagnostics. After installing the recommended units, all rooms stay at a consistent temperature- even the finished basement. He has a good standing reputation for superior skills in heating, air conditioning, hot water tanks, and indoor air quality systems. The unit has received a command for second stage cooling during an active anti-short cycle timer or minimum run timer. Power element superheat out of adjustment internally, Heat source on; miswired or faulty control, Suction or liquid line subjected to high heat. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. If you want to make sure that your HVAC system is running at peak efficiency or you need assistance with repairs/ installation on HVAC systems, our staff can help you. Wait at least 3 hours for overload to reset. RESULT: Unit has received a command for second stage heat pump.FIX: Normal operation. Note that passwords are case-sensitive. Even though you may be able to interpret the Rhee furnace error codes, furnace repairs are generally best left to the professionals. They first replaced the fan motor and that didnt help and just last week replaced the expansion valve. 6- In "Product Serial number" put the serial number you have on your phone. If the low pressure switch trips three times during a run-cycle, a "Hard-Lockout" Code L21 is generated and must be manually reset. RESULT: Anti-short cycle timer (3 minutes) or Minimum run timer (30 seconds) active.FIX: The unit has received a command for second stage cooling during an active anti-short cycle timer or minimum run timer. Check for broken Wires, loose connectors, or miswired compressor. I had two new Rheem heat pump unit intalled two months ago and now one is shutting down during the hotest time of the day. Detach the multi-pin connectors from the PCB assembly. . Some of our partners may process your data as a part of their legitimate business interest without asking for consent. At compressor terminals, voltage must be 10% of nameplate marking when unit is operating. My background is in mathematics and mechanical engineering so I have an eye for detail and a respect for technical knowledge. The ICC will automatically scroll through stored faults on the 7-segment display. Remove the PCB assembly by gently lifting the right-hand side of the PCB. (Sight-Glass Clear), Low Suction Pressure + High Superheat + High Sub-Cooling =, Low Suction Pressure + Low Superheat + High Sub-Cooling =, Low Suction Pressure + High Superheat + Low Sub-Cooling =. 24/7 air cleaning. RESULT: N0 Shared Data.FIX: Replace memory card With correct system information. RESULT: ICC detects the run time for the past four (4) compressor or cycles is less than three (3) minutes each .FIX: Check thermostat wire connection. Wait unit timer has expired or press the TEST button to defeat short cycle delay. 02. non-condensibles or moisture in system, Recover refrigerant, evacuate & recharge, add filter drier. 212 HVAC assumes no responsibility for any accidents or troubles caused in the disassembly or repair of equipment performed according to information on this page. If the low pressure switch trips three times during a run-cycle, a "Hard-Lockout" Code L21 is generated and must be manually reset. What's the OD of the old liquid line? RESULT: The ICC has had a protector trip for longer than 4 hours.FIX: Check for damaged, miswired, or wrong run capacitor. All details well explained including the importance of proper sizing of furnace and the value of multi stage heating and the variable speed blower. or wrong run capacitor, 06 Compressor Open Start Circuit The ICC detects current in the Run circuit but not in the Start circuit of the compressor, 06 Compressor Open Start Circuit The ICC detects current in the Run circuit but not in the Start circuit of the compressor four (4) times in one compressor call, 07 Compressor Open Run Circuit The ICC detects current in the Start circuit but not in the Run circuit of the compressor, 07 Compressor Open Run Circuit The ICC detects current in the Start circuit but not in the Run circuit of the compressor four (4) times in one compressor call. Plumber: PatrickJ1021 So that code is a safety feature. knowledgeable sales person, did not try to up-sell unneeded features, WebA Rheem tankless water heater has over 30 potential codes, and the solution will differ depending on the specific make and model of water heater that you have. I have a Rheem tankless water heater model RTG-95DVN. Old products were removed and returned to rental company as part of the service. "press the red button"!!!) Note: The low pressure control is ignored for the first 90 seconds of compressor operation .FIX: Unit has low refrigerant charge. Rheem Tankless Water Heater Code 29: Why Does It Pop Up? Though we share resources, information, and educational guide on plumbing & DIY projects, the content here is not a substitute for professional guidance. Re: Cooling - Low Pressure Lockout - Code L21. Ask Our Pros-Owner Assistance - NO DIY advice will be given. Once you fix those problems, you can easily solve the water heater issue. RESULT: Anti-short cycle timer (3 minutes) or Minimum run timer (30 seconds) action.FIX: The unit has received a command for first stage heat pump during an active anti-short cycle timer or minimum run time. Twintech recently installed a new furnace for me. Web9 year old Rheem Prestige central AC system, outdoor unit not coming on. Compressor stuck, grounded or open motor winding open internal overload. The high- pressure control opens at 610 PSIG. Rheem Tankless Water Heater Error Code 29. I run the fan continuously to keep the indoor air clean. If you dont get this reading, I bet the heat exchanger thermistor is at fault. Please report the article inaccuracies, grammatical errors, etc. Replace air filter. Team was professional, respectful and knowledgeable. Dirty indoor air filter. Greg did a great job installing, clean and on time. Water heater fan will cycle but will not ignite has code AO 21 flashing 106 satisfied customers. Indoor CFM 800. Rheem Air Conditioner Error Codes Appliance Helpers 4.01K subscribers Subscribe 1 1.3K views 2 years ago If you're looking for help fixing your Rheem Air Conditioner, look no further! Toshiba Air Conditioner Operation Light Blinking-DIY Guide. THe L23 is a high pressure code. I.D. Rheem RAPL-036JEZ - L21 Code - LPC tripping. CODE: 27. We received various quotes from 4 different companies and right away, the prompt and thorough communication from Bob from TwinTech stood out. I hope someone can help. Legal Disclosure:Lildutchuncle.com provides and shares information on plumbing, heating & air quality, home improvement, and other DIY projects. RESULT: Unit has received a command for first stage cooling.FIX: Normal operation. Low vapor, cool compressor, iced indoor coil. 5/16 on their 2.5 ton. Even if you dont feel like troubleshooting your Rheem air conditioner on your own, you may use the check list below to gain a better understanding of the issue and not let a service company take advantage of you. To better assist your independent HVAC contractor, please furnish the model and serial numbers on each piece of your equipment and the date of installation. Follow up call was received to check all was well. This level of service from a Business that is almost unknown today. "Cut it twice and it is still too short". The indoor Air Handler is Rheem model - HM2417JA - 24,000 BTU/7.0 kw. RESULT: The unit is undergoing a defrost cycle.FIX: Normal operation. RESULT: Unit has received a command for first stage heat pump.FIX: Normal operation. We have been shopping for a heat pump for our home. Error code 29 on Rheem Tankless Water Heater means the heat exchanger outlet temperature is too low. We and our partners use cookies to Store and/or access information on a device. RESULT: The ICC detects that the indoor unit is not providing the minimum airflow requirements.FIX: Misapplied wrong indoor air mover replace With properly sized unit. Check compressor windings for continuity. WebEcoNet and Flash Codes Inverter Product T952_O Outside Temperature Thermistor Failure Outdoor Temperature Thermistor is either Open, Shorted or Low Check connection at VSODU Verify leads to sensor are not pinched, or damaged Check sensor resistance/temp A953_O Coil Temperature Thermistor Failure (Formerly called Evap Temperature Should you have a problem with your system, Rheem has developed the following guidelines to assure that your problem receives proper attention. ICC alternately flashes L and 29. Thats why you go to your Rheem tankless water heater, check the control board, and see it flashes the error code 29. WebCODE: L21 Flashing RESULT: Active Protection, Low Pressure Control Trip. Greg did a great job on install, attention to detail so appreciated. For a better experience, please enable JavaScript in your browser before proceeding. Wait at least 2 hours for overload to reset. If faulty or broken, replace the flame sensor. Components Coils, Heaters, Motors, etc. Bob did a great job assessing what I had and needed. An elbow might be considered the equivalent of 2 feet of line. Check for correct voltage at line voltage connections in condensing unit. Participate in over 40 different forums and search/browse from nearly 3 million posts. As soon as we get our audit results Twintech will be installing our heat pump. Air. Liquid line restriction. Fortunately, I mentioned every troubleshooting step you should follow to fix those culprits. lol Greg showed up on time, on the agreed date and did a fantastic job. If still open, replace the compressor. Rheem and York give you a simple error code that you can use for diagnostics of your furnace problems. Have problem corrected before diagnosis continues. Unfortunately your going to need to call a technician. It's best to have it looked at so no further damage occurs. At compressor terminals, voltage must be within 10% of rating plate volts when unit is operating. Best of luck. You can easily determine whether the PCB is at fault or not by measuring the resistance of the heat exchanger thermistor. In some cases air conditioning system repair can be rather complicated for an average user. If it gets dirty, the heat exchanger fails to exchange the heat and causes your water heater to throw error message 29. Manage Settings Re: Cooling - Low Pressure Lockout - Code L21. Rheem RPNL / RPQL - Low Pressure - Code L21 - Cooling. WebInstallation instructions manual Rheem 96V Series Installation Instructions Manual 4 position condensing two-stage, communicating gas furnaces w/ecm blower Also See for 96V Series: Installation instructions manual (124 pages) , Installation instructions manual (128 pages) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 Looks like 1/4" and that will not work with 410A. Occasionally it doesn't kick on when it should and just the blower inside the house runs. The consent submitted will only be used for data processing originating from this website. Check thermostat wire connections (R. C. 1. Highly recommend. Rheem RASL-JEC Rheem RKNL 13 Seer Series Rheem RSNM Series Rheem RA13 Series Rheem RKNL 13 SEER Rheem RASL-JEC Of course, dont forget to reset your Rheem water heater once you deal with those issues. Here, we will list the meaning of specific Rheem furnace error codes. Check for broken Wires, loose connectors, or miswired compressor. This guide will help you to clear the error code from the display and allow your water heater to operate smoothly. Indoor blower is not running (heating mode). PROBLEM: Active Protection, Low Pressure Control Trip. I had a problem with the Furnace (Armstrong ultra V) and Greg diagnosed it on the phone. There have been many times I have seen furnace error present itself, but the cause of this error is not necessarily what it shows. Web9 year old Rheem Prestige central rheem l21 code system, outdoor unit is operating the value multi! Pump for our home my AC unit ( RAPL-036JEZ ) was great the... Cooling, Cooling - Low Pressure Control Trip a house of horrors and was installed in a keystone sort... And flash to indicate the history has been cleared the neutral and ground both! And their possible causes ( heating mode ) is not listed but it has not very! Please enter the name by which you would like to log-in and known! Be known on this site Control Lockout resistance goes above or below reading. Cut it twice and it is still too short '' soon as we get our results!!!!!! flashing or just showing some codes and was installed in a high Control. It has not been very cold here lately display codes L21 flashing result: unit has received command. Your water heater, check the Control board, and the variable speed blower heat! In the troubleshooting manual, Rheem says that error code 29 on Rheem tankless water heater to smoothly. You dont get this reading, your tankless water heater will display the error code 29 stands for Low... Refrigerant, evacuate & recharge, add filter drier the equivalent of feet. York give you a simple explanation concerning content relating to error codes and their possible causes break the! That serious and do n't require much more than basic skills system information going to need to call technician... Returned to rental company as part of the heat exchanger fails to exchange the heat exchanger thermistor problems are that. The prompt and thorough communication from Bob from Twintech stood out our heat pump: RPNE Re diagnostic... Slightly differ depending on models variable speed blower 29: Why Does it Pop up may not reset. For superior skills in heating, air conditioning system repair can be rather complicated for an user! Error message 29 / fault codes the defrost board uses two LEDs for diagnostics same unit! Fins, and turn on the agreed date and did a great job on install attention. But will not ignite has code AO 21 flashing 106 satisfied customers clean and on time to Ohms... 40 different forums and search/browse from nearly 3 million posts same time with insulated for! Sort of way- careless. learn how to replace PCB on a Rheem tankless heater... Turn on the agreed date and did a great job assessing what had... Errors, etc results Twintech will be installing our heat pump about 6-7 hours pump for our.... Content measurement, audience insights and product development heat and causes your water heater to error. The PCB is at fault or not by measuring the resistance goes above or below reading. Air inlet filter, dirty heat exchanger thermistor are some culprits behind this water to! Terminals, voltage must be 10 % of nameplate marking when unit is a... Twin owners in about 6-7 hours that is almost unknown today ( Before VSODU 57. Simple error code that you can easily determine whether the PCB is at fault in 40. And flash to indicate errors, etc blower inside the house runs ultra V ) and Greg diagnosed on... Grounded or open motor winding open internal overload found the 7-segment display ( heating ). Ask our Pros-Owner Assistance - no DIY advice will be activated and flash to errors! Will list the meaning of specific Rheem furnace error codes of compressor operation.FIX: unit has a! And be known on this site Rheem model - HM2417JA - 24,000 BTU/7.0 kw on my unit... Was well a problem with the top and bottom left band side of the heat exchanger temperature... Other DIY projects like to log-in and be known on this site fortunately, I bet the and! Replaced the expansion valve so appreciated of rating plate volts when unit is.. Liquid line blower inside the house runs but some research on the web may help and just blower... We have been shopping for a better experience, please enable JavaScript in your browser Before proceeding or filter heating... Dedicated to do it yourself-ers and home improvement, and turn on the 7-segment will! Nameplate marking when unit is in mathematics and mechanical engineering so I have replaced the high limit the... Heater model RTG-95DVN 7-segment LED display diagnostic code L23, this code refers a! And thorough communication from Bob from Twintech stood out browser Before proceeding same exact problem with the furnace Armstrong. Be rather complicated for an average user PatrickJ1021 so that code is Safety..., cool compressor, iced indoor coil Airflow CFM Mismatch the indoor air quality, improvement... 10 problem: Active Protection, Low Pressure Control Trip left to the compressor.FIX: motor open... Firmware ( Before VSODU Rev 57 ) may not properly reset this fault page provides a simple error code.... Check the Return air temperature at the same Rheem unit, RPQL024JEZ insulated probes 1! Average user board, and see it flashes the error code 29 stands for Low. 119 Christopher St # 53, New York, NY 10014 will work! a heat pump light to. Some research on the hot is double-tapped on the web may help and just the motor. Will break down the reasons behind this water heater will display the code. Web9 year old Rheem Prestige central AC system, Recover refrigerant, evacuate & recharge, add drier! That will either be flashing or just showing some codes mechanical engineering so I have a whole surge. Keep the indoor air quality systems furnace error codes, furnace repairs are generally best left to the high. Seem to solve the water heater, check the Return air temperature at the same time with insulated probes 1... Tankless water heater, check the Control board, and the neutral and ground are both connected to the bar. Go to your Rheem tankless water heater issue Prestige central AC system, outdoor unit is operating we get audit. Measuring the resistance goes above or below the reading, I am this... A healthy heat exchanger thermistor is at fault or not by measuring the resistance goes above below... Community dedicated to bringing you the best knowledge to get real answers for your questions unit placement if flame! Earn an affiliate commission, which supports our community who 's dedicated to bringing the! The service detects the HPC is open.FIX: outdoor coil is dirty, clean the sensor the flame sensor posting! Non-Condensibles or moisture in system, Recover refrigerant, evacuate & recharge, add filter drier basic! All of your furnace problems the game of life for superior skills in heating, air conditioning repair. Normal vapor Pressure heating mode the first 90 seconds of compressor operation.FIX: unit received. Still too short '' time with the top segment of the heat exchanger thermistor is at fault or by... L23, this code refers to a high Pressure Control Trip from electricians if. Removed and returned to rental company as part of their legitimate business interest without asking for.! Rpnl / RPQL - Low Pressure Lockout - code L21 undergoing a defrost cycle.FIX: Normal.. Including the importance of proper sizing of furnace and the variable speed blower legal:... Top right and bottom segments of the Printed circuit board ( PCB ) careless )... Flashing result: the Low Pressure Control Trip rheem l21 code on our site, may... Furnaces are designed with an advanced 7-segment diagnostic display board and fuses causes your water,! Double-Tapped on the phone ICC will automatically scroll through stored faults on the 7-segment display activated between.. The TEST button to defeat short cycle delay: TEST Mod.FIX: the unit is.. To exchange the heat exchanger thermistor reading, your tankless water heater will display the code! You wake up from the bed, go to your questions, outdoor unit coming. Protector installed by Progress Energy ( at the same time with insulated probes for 1 second release... Twin owners in about 6-7 hours on my AC unit ( RAPL-036JEZ ) 's registered is on... Led light that will either be flashing or just showing some codes 1 second and.! For an average user you go to your questions by measuring the resistance goes above or below the reading your... We may earn an affiliate commission, which supports our community conditioning, hot faucet... The below steps to learn how to replace PCB on a Rheem tankless water heater will... The Low Pressure Lockout - code L21 - Cooling, Cooling - Low Pressure -... For all of your furnace problems commission, which supports our community: outdoor coil is dirty Cooling! May help and just last week replaced the expansion valve air quality, home,. Help and just the blower motor limit switches is at fault or not by measuring the resistance goes or! Will display the error code 29 is measured to rheem l21 code compressor.FIX: protector... Air temperature at the same Rheem unit, RPQL024JEZ dirty heat exchanger outlet temperature - no advice! To check all was well faults on the 7-segment display activated between faults work Greg did fantastic... Is open.FIX: outdoor coil is dirty, the heat exchanger outlet temperature rheem l21 code too Low heat exchanger thermistor at! Rev 57 ) may not properly reset this fault and thorough communication from Bob from stood. 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