Rheem Paloma PTG-74PVN / RTG-74PVN Natural Gas Indoor Logo
Posted on Jan 11, 2011
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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 give us a short term fix on the A0 21, before we deal with the recall?

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  • Posted on Jan 21, 2011
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Well i just got the same code on my commercial unit PH-28 C IFSP-1 and I am trying to figure it out. I installed it a few years ago and never had a problem until now. The code 21 is some how suppose to relate to the air filter, but i see absolutly no sensor to the air filter that is located on the outside of the front panel. I took the panel off to observe things and tried the unit. The same code came up. I am not sure where the sensor is which would help to at least understand the nature of the problem. I hope to find a solution soon.

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I have a Paloma water heater (serial# PTG-74PVN-2) that is now getting a code 11 error. For the 1st. 2 years of operation we had no problems with the unit. Then we started to get this error code. No new...

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