Our furnace pilot is on, fan works, thermocouple was replaced at beginning of heating season this year but the furnace won't come on. The thermostat clicks but the furnace doesn't fire. The fan runs when the thermostat is switched to fan only. Any suggestions?
ckadee
Coleman furnace model # 7956-856
IF Pilot is remaining lit, Thermocouple is fine. Blower motor coming on verifies main voltage (120vac) and low voltage (24vac).
That also verifies the transformer.
IF your GV is getting 24-28vac, check burner orifice, burner tube for blockage (spider).
If all clear, need to have gas pressure checked.
IF GV is not getting 24vac, test across t-stat R and W, should read 0 vac with call for heat.
Take care and best wishes,
Robert
That also verifies the transformer.
IF your GV is getting 24-28vac, check burner orifice, burner tube for blockage (spider).
If all clear, need to have gas pressure checked.
IF GV is not getting 24vac, test across t-stat R and W, should read 0 vac with call for heat.
Take care and best wishes,
Robert
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