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halapeno		#1 Posted : Sunday, November 25, 2007 9:47:37 AM(UTC)
Rank: Member Groups: Registered Joined: 11/25/2007(UTC) Posts: 2		Even with the system turned off at the thermostat, the blower turns on about once an hour for about 5 minutes. I replaced the thermostat, but still have the same symptoms. Otherwise, both the heat and AC work well. Anyone have a clue why the blower wants to cycle without heat or AC?


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kooler		#2 Posted : Tuesday, November 27, 2007 1:21:09 PM(UTC)
Rank: Advanced Member Groups: Senior Expert Joined: 10/31/2007(UTC) Posts: 214		You didn't list a brand or model number for your system so one can only guess what you're dealing with... There is a control that will cycle the blower that measures the temp inside the heating chamber called a fan limit switch... Generally it's designed to only turn the blower on when the chamber is hot/warm (during the heating mode) so it's possible this control is malfunctioning and cycling the blower when the chamber is cool... Suggest locating and inspecting/replacing this fan limit switch...


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