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halapeno  
#1 Posted : Sunday, November 25, 2007 9:47:37 AM(UTC)
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halapeno

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)
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kooler

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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