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    cheryl59's Avatar
    cheryl59 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Apr 25, 2008, 03:23 PM
    Furnace running when everything off
    I have a colman 7900 series in a mobile home dated 1985 just purchased in Oct 07. The problem is the weather has been warm so shut furnnace off and noticed today the fan is running automatic, I do not want this as to save on electric bill... Do I have a problem and where does the switch need to be in warm weather. :confused:
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    Apr 25, 2008, 05:25 PM
    On simple thermostats there is a switch labeled FAN with two positions ON and AUTO, Make sure it's in the AUTO position.

    There should be another one labeled COOL - OFF - HEAT. Make sure that's in the OFF position.

    A common failure mode for old furnaces is that the contacts in the relay that operates the fan fuse together.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #3

    Apr 25, 2008, 05:57 PM
    Usually old Coleman units for mobile homes have a 2 wire thermostat with a change over switch on the furnace. Is this what you have.
    cheryl59's Avatar
    cheryl59 Posts: 2, Reputation: 1
    New Member
    		  
    #4

    Apr 26, 2008, 05:50 AM
    I am not sure of switch but I did do the previous answer which was shut to off and leave in automatic and the blower never come bk on so thank you
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