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    Matt Kaleida's Avatar
    Matt Kaleida Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Nov 13, 2006, 10:00 AM
    Electric Coleman Mobile home furnace
    The blower fan keeps running and will stop until the breaker is shut off for a while. It may run fine through its complete cycles for a day or two, but will do it again! The furnace hasn't been used for about 4 years. What needs fixed or replaced, and where do I find these parts? The trailer was built in 1974, is in fair shape, and located in Summersville, West Virginia. Help!
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
    Uber Member
    		  
    #2

    Nov 13, 2006, 11:15 AM
    In something that old, the blower is controlled by a relay operated by a limit switch. Follow the lead from the motor back to a little box. It should have 4 wires, the one from the motor, one from the house wiring, one to the transformer, and one to the limit switch. If, with the power off, the line from the house and the lead to the motor have continuity, the relay is stuck. Take it to a electrical or HVAC supply, and let them match it. They should have at least a work alike. If it is open with the power off, them likely it is the limit switch. Follow its wire into the heat exchanger, and take it to the supply house. The older systems are cheaper and easier to fix.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #3

    Nov 22, 2006, 04:35 AM
    The parts may not be available. Have an HVAC person change the system over to a Sequencer and get rid of all the old obsolete relays Etc.
    dusty1954's Avatar
    dusty1954 Posts: 1, Reputation: 1
    New Member
    		  
    #4

    Feb 13, 2007, 09:10 AM
    Ihave a coleman electric furnace model #3500A818 the coils light up even when the thermostat is in the off position
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #5

    Feb 13, 2007, 09:25 AM
    Quote Originally Posted by dusty1954
    Ihave a coleman electric furnace modle #3500A818 the coils light up even when the thermostat is in the off position
    Bad sequencer

    Part number 3115-3571 Sequencer

    Sequencer controls the sequence in which the heating elements & blowers turn on. This one has the ability to control up to 2 blowers (H1-H4) and 3 heating elements (M1-M6). Replaces 3400-357,
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    baer1213's Avatar
    baer1213 Posts: 1, Reputation: 1
    New Member
    		  
    #6

    Sep 24, 2013, 08:41 PM
    I have a coleman furnace model 7655-856 think it a 1982 when it call for heat it light up but blower don't kick on .I cheeked blower motor and it run. What do I need to replace
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
    Ultra Member
    		  
    #7

    Sep 25, 2013, 04:55 PM
    baer1213: I suspect you have a bad fan switch. This is a temperature actuated switch which closes to turn the fan on once a certain temperature at the switch is reached.
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