Question about Ruud UBHC Air Conditioner

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Ruud silhouette #UHDG-07EAUER won't heat house

I have shut everything down.  Turned up thermostat  Turned on gas Turned on power Induced draft motor starts Igniter warms up (glows red) Main burner lights  Main burner remains powered and lit Indoor blower motor FAILS to start System SHUTS DOWN
What is causing the blower motor not to start? It suggests to clean the flame sensor unit with steel wool in my manual but doesn't tell me where it is.

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  • Perry Putnam
    Perry Putnam May 11, 2010

    Try turning the blower to on at the T-stat and tell me if the blower runs at all.

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Cleaning the flame sensor has nothing to do with blower motor not turning on. You either one of the following problems 1 bad cap for motor. 2 bad motor. 3 bad limit on blower housing or 4 a bad board. You will need a volt meter to check for these problems. Try seeing if the fans runs with unit of and fan switch turned to on. Also does motor hummmm. Is motor cage free ( can check by manually turning) If motor doesnt humm and the cage is free wheeling then you will need to find out if you have power going to the motor. If you find out that you do then you will need to change blower motor. If you do not have power then you will need to check limit with continuity tester on volt meter. If that checks fine only 1 thing can be wrong and that is the board.

Posted on Feb 16, 2009

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