Questions & Answers for: Rheem what does f 21 mean

...isn't set anymore, what does that mean? its most likely diplaying a code... is it code 21? that usually will follow ao. first make sure the door is securely on, if not make sure it contacts the ...

error code 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 ...

21 in a-1 it is a natural gas indoor. What does this mean and is there something I can do to fix it or do i have to call a plumber look up the code in the installation manual or on the inside panel of

...21) on our Paloma PTG-74PVN. I'd love a list of what different error codes mean. Also I noticed a reall search, and it seems our unit is listed for recall. Can you give us a short term fix on the A0 ...

We have a Richmond Tankless water Heater that is flashing between A1 and 21 and not heating the water. Error 21 means the air intake cover problem. Malfunction of Air Intake Filter Switch Ensure air ...