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Rheem Short Cycling Troubleshooting
I have a Rheem Criterion RGDJ-12EARJR. I've been having an issue with it short cycling. The burners will ignite and shut off a few seconds later.
I have cleaned the Flame Sensor and I have replaced the Flame Sensor neither of which fixed the issue. Following the Troubleshooting guide that Rheem provides I then checked the Ground and Polarity of the IFC board and those were good. I replaced the IFC board as last measure of the Troubleshooting guide and that has not fixed the issue. For sanity I replaced the Flame Sensor a second time to ensure it was not that.
All the symptoms point to the flame sensor or IFC board however the issue was not corrected after replacement of either. I cannot see any DC current on the Flame Sensor to the IFC board (I see AC of about 4 uA). I have continuity on the wire from the flame sensor to the IFC board.
The flame looks nice and blue for the few seconds it is on.
Any other checks I should do to isolate the issue? If it is the Gas Relay Valve I don't intend to try and fix that myself.