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Old 02-22-2011, 10:03 AM   #1
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No heat gas furnace


I woke up this morning to a cold house. My furnance was running but there was no heat. The burner and pilot were out. Please help?? We have been in this house for 4 years now and have always had problems with it. We have changed the coupler, the ignitor and the thermostat.

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Old 02-22-2011, 11:12 AM   #2
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No heat gas furnace


Basic sequence of operation:
1. Thermostat calls for heat
2. Inducer draft motor is energized ( small blower connected to the flue inside the furnace.
3. The pressure switch makes enabling the ignitor.
4. the gas valve will now energize sending gas to the burners.
5. Main blower comes on and stays on untill the thermostat shuts it down.
Watch your unit start and check this sequence and see what doesn't happen and let us know.

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Old 02-22-2011, 11:51 AM   #3
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No heat gas furnace


The blower continuously runs and the thermostat calls for heat but it won't ignite

Last edited by concal; 02-22-2011 at 12:37 PM.
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Old 02-22-2011, 01:30 PM   #4
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No heat gas furnace


You could have an open limit which turns off the gas when the furnace over heats.

How old is the furnace and a model number would help greatly.

And what would be the best is if you can post pics of the furnace with the top and bottom removed.
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