Gas furnace won't light

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  #1  
Old 12-20-08, 06:42 AM
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Gas furnace won't light

I have a Carrier weathermaker 9200 furnace. The blower turns on but the pilot light/gas/fire doesn't. Went through the diagnostics on the furnace. Removed lead from teh R on the thermostat terminal strip, shorted the lead to the 24V Common and the LED flashes 1 short and 1 long which should indicate presence of 24 Vdc. The remainder of the test when the blower/inducer motor turn on, the LED is OFF. The LED doesn't illuminate again until the end of the test which indicates presence of 115 volts. During normal operation (Not in test mode) the LED illuminates to indicate the blower motor is on.
Any help on this would be appreciated.
 
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Old 12-21-08, 09:43 AM
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Smile Solved furnace lighting mystery

Turned out to be the inducer motor. Inducer motor was starting to seize. Ran resistance test on motor windings. Discovered short. Replaced inducer motor (Fan removal was a pain), and all is working well.
 
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