Rheem R92PA furnace issue

Old 01-16-22, 06:07 AM
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Rheem R92PA furnace issue

Yet another post about flame sensors...

My Rheem R92PA furnace flashes code 13. It will fire the burners but they immediately shut off - they are not on for more than 1 second. I cleaned the flame sensor - no change. Replaced the flame sensor - no change.

The unit startup sequence appears to be correct - draft inducer starts, burners ignite, shut down, purge cycle starts. It will do this 3 times, then goes into lockout. The flame sensor is enclosed so I can't really see if it's actually in the flame or not. Is a second or less enough time for the flame sensor to sense the flame, generate voltage back to the board signaling a good start? Seems like a very short time...
Old 01-16-22, 08:25 AM
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Old 01-16-22, 01:31 PM
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The only way to monitor a flame sensor is to connect a test meter in series with the rod and the wire. The meter needs to be able to measure ua (microamps). It is very important that the rod be in the flame. A very common problem is the crossover ports are dirty and the last burner doesn't light quick enough.

You need to put a test meter on the pressure switch and see if it opens when the burner ignites. Set it to AC volts.... it should remain at 0v during ignition and re-ignition.

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