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Old 12-13-2009, 11:59 PM   #1
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Furnace won't come up to heat.


My Lennox Innovator furnace won't come up to heat. It comes on, runs for 10 minutes and then turns off. The thermostat is set at 19.5 and the furnace shuts off at about 17.5. I have read the discussion on flame sensors and on ignitors but don't see those as the problem clearly. In Edmonton it is 40 below and I would love a solution. Thanks.

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Old 12-14-2009, 05:03 AM   #2
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Furnace won't come up to heat.


Check air filter.
Could be a thermostat problem. Have you checked your furnace for error codes.
Your may or may not have that ability.

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Old 12-14-2009, 02:11 PM   #3
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Furnace won't come up to heat.


Thanks very much for your kind help.

I have done a hard reset of the thermostat. I have cleaned the air filter. I know nothing of error codes. i will be looking for a resource to tell me about error codes for my furnace.

How would i know if the thermostat is malfunctioning?

David
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Old 12-14-2009, 02:43 PM   #4
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Furnace won't come up to heat.


Use a meter to see if its sending voltage the the W terminal at the furnace control board.
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