Rheem criterion II: burner turn off after a few seconds

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Old 01-04-12, 07:30 AM
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Rheem criterion II: burner turn off after a few seconds

My Rheem Criterion II furnace suddenly quit working yesterday (6 degrees outside, go figure). The exhaust fan turns on, the gas ignites a few seconds later, but then goes out after burning for only 5-10 seconds. It cycles this way 2 or three times, then quits completely. Sounds like it could be the flame sensor. I can see the flame sensor, but can't see how to get to it. Do I need to remove other components in order to get to the sensor?
 
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Old 01-04-12, 07:34 AM
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Yes, I'd start by cleaning the flame sensor.

Usually they are pretty easy to get to, and it would be unusual to have to remove other components.

Try describing what you are seeing in more detail.
 
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Old 01-04-12, 07:41 AM
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There are two gas jets -- the flame sensor is behind the one on the left. I can't see or feel any screw that attaches the sensor to the furnace. I can get me hands on the sensor and may be able to clean it with some steel wool without having to remove it.
 
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Old 01-04-12, 07:48 AM
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Try the steel wool. It doesn't take a lot to scrape away the coating of invisible oxides that is the usual problem.


Pretty much always there is a screw holding the flame sensor in place that is pretty easily removed. But perhaps not in your case.

When you have repair or maintenance work done in the future, ask the repairman to show you how to remove the flame sensor.
 
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Old 01-04-12, 08:11 AM
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Got it! Took less than 60 seconds with the steel wool. Restored power to the furnace and it's been running ever since. 16 outside, 66 in my house. Thanks for the advice!
 
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