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Rheem Criterion II - blower works OK w heat or AC, not by itself

The problem appears to be in the internal wiring or control board.

Symptom: If I temporarily connect the red low voltage control wire from the transformer to the green control wire for the fan, a relay clicks on the control board. But the blower does not come on.

I have tried re-seating all five of the blower wire connections to the circuit board but this didn't help.

Does anyone have any suggestions? I'm just a homeowner, not an HVAC specialist. I'm positive the problem is not in the stat or any of the five wires from the stat to the Rheem. Thanks in advance for any thoughts.

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  • Stuart Smolkin Jul 12, 2009

    t1m130, thanks for your reply.

    I do know the blower is good; it runs fine when the AC or heat comes on. It only won't run if I change the fan switch on the stat from "auto" to "on."

    As mentioned, the stat is good, the green wire from the stat to the control board has good continuity, and I can hear the relay click on the control board if I jump the green low voltage fan wire to the red low voltage power wire.

    So... I'm suspecting your thought about a burnt spot on the back of the control board is the most likely possibility... unless there's some dip switch setting that deactivates "fan on", so that the fan won't come on even if I choose "fan on" on the stat.

    I hope this clarifies; thanks in advance for any additional thoughts.



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Does the blower do anything? turn the power off and take the lead that comes off of the "cool" ( wire from the blower motor) and hook it up to the outlet side of the door switch ( the wire that comes off the door switch and goes to the board) turn the power back on and push the door switch in this will allow 110v to the blower if the blower runs the blower is good

reatach all door switch wire and blower wire to "cool"

disconnect all low voltage terminal wires at control board from thermostat make a jumper with a seperate wire from R to G if it runs it is your Thermostat or the wires inbetween the two

if it doesnt you probably have a burnt solder spot on the back of the control board and will need to replace the board

hope this helps

Posted on Jul 12, 2009


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