Intermittant fan opperation on a coleman 7655-856

Questions about repairs and parts for Coleman furnaces, air conditioners and heat pumps for manufactured homes. Click here for Coleman parts.

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markobrien
Posts: 1
Joined: Sat Oct 20, 2012 8:14 pm

Sat Oct 20, 2012 8:27 pm

Hi

I have a 7655-856 unit and it short cycles after the burner turns on, the Fan motor is new and I have replaced both of the limit switches, Any suggestions ? I feel the fan switch is the cut out issue, could the new fan be pushing to much air, or could it be a burner issue?

Mark


DaleM
Posts: 385
Joined: Wed Apr 07, 2010 10:07 am

Mon Oct 22, 2012 9:58 am

There's a couple things you need to check. First see if the burner flame at full burn is large and blue. If so repalce the fan switch. Second if that flame is weak I suspect a web in the burner oriface. It is hindering gas flow and causing a small flame. The blower will come on but it will short cycle because it is removing heat from the heat exchanger faster than the burner can supply it.

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