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About Howard Livingston
Expertise
Can answer questions on electrical control circuits, power supply,airflow & distribution, electrical components,refrigerant problems,gas, electric & propane furnaces.No boiler or refrigerator or oil fired furnaces experience.Just HVAC questions please.
Experience
35 years experience in residential & light commercial repair & installation.
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None
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None
Education/Credentials
Mechanical Engineering degree.
Awards and Honors
None
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You are here: Experts > Home/Garden > Home Appliances > Heating, Air Conditioning, Fridge, HVAC > AC blower turns on by itself
Expert: Howard Livingston - 11/8/2009
Question
With the fan switched to auto, heating and cooling in off position. the fan intermittently turns on for 10mins and cycles off and repeats the cycle. i removed the thermostat, but still repeats the cycle. i have a digital ritetemp thermostat.
Answer
Wow, Ralh, thats really weird. A circuit board controlled furnace has a timed circuit for blower control. That circuit could be faulty. The older kind of furnace control has a heat sensing switch that is adjustable. Maybe this kind is set too low temp & needs adjusting upward. Which one do you have ?
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