Fum Sensor On AO Smith Power Vented WH - Plumbing - DIY Home Improvement | DIYChatroom

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Old 12-15-2008, 11:24 PM   #1
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Fum sensor on AO Smith power vented WH

......Can it be bypassed by installing a 34k resistor?

I had to go back on a no hot water call for a GPVH 50-100 AO Smith pwr vent WH. The "very hot" and the green "vacation" status lights were lite up but of course the WH inducer was not atctivating.

I went thru the reset procedure but the WH remained in lockout.

I measured the fume senor resistance at 35k ohms. Should have been good but WH still would not fire. I thought there something I was overlooking but factory tech said if the sensor ohmed out OK then I had to change the Valve/thermostat.

I changed both and got the WH back on line.

There are a lot of ceramic paints(Not flameable) in the basement so I am wondering if they are affecting the sensor is it possible to replace sensor with a 35k ohm resistor to avoid nusiance sensor trips?

I am assuming I am not the only one who has wondered about this.


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