Question about Heating & Cooling
Went to turn on heat this year, won't work. The draft inducer fan does not turn on, therefore the pressure switch will not close. 3 blinking lights. Cleaned out the blower assembly, blew and sucked pressure switch relay, tried start up process with one wire off pressure switch relay, any suggestions?
Turning the fan to "on" on the stat does make the fan come on. When turning the heater on, you get a click meaning the stat is telling the heater to come on.
Induced Draft Motor Will Not Run
On furnaces with an induced draft motor, the motor must first come up to speed creating a negative pressure for the pressure switch. This switch must only be closed after the induced draft motor comes up to speed or the motor will not start. If this switch is jumpered (bypassed by the technician) prior to a call for heat the furnace unit will give an error code of “pressure switch contact failed in the closed position”. If the motor does not start check for induced draft motor wheel stuck or seized, lack of 115-volts to the induce draft motor, bad start capacitor on induce draft motor, defective inducer motor.
Posted on Oct 27, 2008
Most forced draft fans are powered by 120 volts . close to the fan is usually a plug that unsnaps. create a call for heat after turning off to clear safetys and see if your getting 120 to fan on initial call for heat. if you are then fan draft motor is bad, usually sold as an entire assembly replace exact as it came out. sequence of operation is..... stat calls for heat via common and white wire to furnace , 24 volts. ......board sences call and sends 120 volts to forced draft ........ motor runs and creates pressure on proofing switch,....... switch closes 24 to board and tells it draft fan is on......... board then energizes ignitor,....... after ignitior glows gas valve is opened and burner lights ........ either ignitor or seperate sensor rod tells board the burner lit........ and a few minutes later the fan comes on and hot air is blown out. if a step is missed or doesn't proof the furnace either trys up to three times to light or locks out. turning off power usually resets safetys and it will resume attempts to lite normally.
Posted on Oct 26, 2008
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Posted on Jan 02, 2017
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