Questions & Answers for: 21 3 Water Heaters

Hatco Model c-21: How do you delime unit? is there a way to disconnect the supply and run vinager thru the out let backwards to the supply with a hose attachment,,

Model PTG-74PVP-2 Error Code A0 21. No hot water. check to make sure the air vent is clean and that the front cover is on properly

palaoma ptg-42pvn flashing 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 ...

My water heater is brand new. Last night was the first time we turned it on. I get a code 21 on the remote. I read that I need to clean the burner and the filter, but being new I can't believe that it

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 ...

Error coding A0 21 resulting in no hot water. check the power supply or the gas line

We are getting error codes (A0 and 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 ...

Model RTG-42PVP my display is switching back and forth between A1 and 21. Use following link for Rheem tankless troubleshoot: http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html ...

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 ...

Working on a N1321-ASME unit installed in a Taco Bell. Getting error code 21. Unit gas pressure is at 8.5wc and manifold pressure spikes to 2 when it come on but unable to see what it remains at ...