Questions & Answers for: Rheem a1 21 Computers & Internet

...a1 21 code I have just installed a brand new tankless water heater and its flashing a code. A1 followed by 21. Does anyone know what this code refers to. It is not in the owner's manual and I can not ...

...21 and then A1. If the gas is empty, do I need to fill my main propane tank outside? That would be a YES...you need to make sure the tank is serviced and at the proper levels... Thanks for trying ...

...21 A1 error code 21 A1 This means the air intake cover problem. 21 Malfunction of Air Intake Filter Switch Ensure air filter door is properly seated. Ensure front panel is properly installed. Error ...

...A1 and 21. Use following link for Rheem tankless troubleshoot: http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html I believe error code A1 21 is malfunction of Air intake filter ...

...A1 and 21 and not heating the water. Error 21 means the air intake cover problem. Malfunction of Air Intake Filter Switch Ensure air filter door is properly seated. Ensure front panel is properly ...