20 Most Recent Rheem Paloma PTG-74PVN / RTG-74PVN Natural Gas Indoor - Page 2 Questions & Answers

flush it with vinegar

you have trash in the valve .shut it down take the valve apart clean it . also maintenance on this unit is needed.seal can be bad also. hope it helps.send pictures of the unit and age and model serial number.

http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html Gene h If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

This unit should be electronic ignition. Multiple issues could be the cause. First check the flame sensor. If those is not the problem then probably a bad control board. Don't know specs on the resistance of the flame sensor. You could try cleaning it with an emery cloth or sandpaper. Do not touch flame sensor with fingers it will ruin it

If combustion chamber is leaking, then probably cheaper to replace water heater. Must have correct condensate drain, or acidic water will drip into combustion chamber and eat hole through metal, and then short out electronics. http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html Gene h If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

check the air intake

Sounds like a relay inside the air handler is stuck 'closed'...

http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.htmlGeneh If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7