It is a 120 volt igniter and the transformer is not the problem. downflow gas furnaces models with input rates from 50,000 to 150,000 btu/hr (8 pages) 46: Low-pressure switch open inducer on low. 44: Low-pressure switch closed inducer off: Check the inducer. Did you push buttons in on little flame roll out switches above and beside burners o see if they would re setAirheatman41941. There is a hose that runs from inducer vent motor down to the canister pressure switch. Tried the pressure switch suck in/blow out trick but clicks each way. Very remote chance that the wiring harness from the igniter is broken. " See to it that the pilot light goes out. It stays on for about 5 or so se … read more I was working on a Rheem furnace today and the "Heat Assisted Limit Switch" was cutting the burner out after about a minute, then would reset and so on and so on. The first method is to measure continuity and resistance while the furnace is running. Locate the flame sensor at the back of the furnace and in the path of the burner. AS soon as inducer starts, suck and keep sucking on hose(you should hear it click) Hey Paul, I have a Rheem Criterion II furnace. 
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The fact that the main valve opens means all the safeties are proven so the only thing left is the circuit board. Rheem Criterion II is a discontinued gas furnace model.
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