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Old 06-22-2013, 03:57 PM   #1
Osh
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furnace exhaust fan


We turned on the AC for the first time today. It's a 90% efficient furnace so it has a pvc "chimney" out the wall. Walking past it on the driveway I noticed the exhaust fan was coming on and off every 5 seconds or so. The fan feeding the cool air to the house is working fine. Any thing that I should look for first? It does not do it when the heat is on.

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Old 06-23-2013, 07:19 AM   #2
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furnace exhaust fan


What brand and model number thermostat do you have.

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Old 06-23-2013, 08:42 AM   #3
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furnace exhaust fan


It's a White Rodgers 1F80-51 programmable. Could it be the batteries?
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Old 06-23-2013, 09:18 AM   #4
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furnace exhaust fan


When did you install the thermostat?
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Old 06-23-2013, 09:26 AM   #5
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It could be the batteries. Replace them. If it still does it. Remove the wire from the W terminal on the furnace board and see if it still does it. If it does, then its something with the furnace board, or a furnace safety.
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Old 06-23-2013, 10:15 AM   #6
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furnace exhaust fan


It was the batteries. Weird that it did it only with the AC on and not the heat. The thermostat is well over 20 years old and I can't remember when the batteries were changed last, the display was still working.

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Old 06-23-2013, 10:25 AM   #7
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furnace exhaust fan


While I do make money coming out and putting batteries in people's thermostats. I prefer for them to try new batteries themselves first. So they don't fall over when they see what it cost for me to come out and do it.

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