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Old 11-27-2010, 01:51 PM   #1
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blower motor cycling on an off

i have a old 70% american standard gas furnace, once i call for heat the furnace starts and it fires up, the blower comes on but shortly turns off , then on again ,off again continuously, what should i check? i am a very new hvac tech and i am stumped , any suggestions ?
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Old 11-27-2010, 02:43 PM   #2
Join Date: Dec 2008
Location: West Michigan
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blower motor cycling on an off

could be a fan switch malfunction or out of adjustment. Could also be the motor kicking out on the thermal overload. Check for voltage to the motor when it stops. No voltage = fan switch, voltage = motor.
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