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I have a Coleman 3300-9051 electric furnace w/AC. The blower continually runs.

Where do I find a repair manual and/or what could be the problem. How do I test it.

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  • Are you sure you got the model number right? I was able to find this site. If you select one of the furnaces here, and click Technical Specifications on the page it leads you to it will open a PDF with quite a bit of information.
    – Tester101
    Feb 23, 2012 at 13:13
  • Yes I am sure of the model number, but its a relic like 1985 so its fairly old
    – bluexrider
    Feb 24, 2012 at 0:04
  • I was also told it may be a sequencer problem
    – bluexrider
    Feb 24, 2012 at 5:34
  • Found out the heat pump has blown the fuses the circuit breaker was tripped. When I reset it, it blew the fuses. MAJOR ISSUES NOW.
    – bluexrider
    Feb 24, 2012 at 23:04
  • fuses/circuit breaker, electric furnace/heat pump, lot of conflicting descriptions. It's not really clear what's happening.
    – BMitch
    Feb 25, 2012 at 20:08

2 Answers 2

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Couple possibilities I can think of:

  • Thermal switch in the furnace is broken, making it appear to be too hot, and the blower is running to cool it off.

  • Thermostat has the fan switch set to "on" instead of "auto"

Check the thermostat before trying to work on the furnace itself.

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  • I have checked the thermostat and it is set to auto. The t-stat was replaced last year with a digital readout model
    – bluexrider
    Feb 24, 2012 at 0:05
  • Possible but incorrect
    – bluexrider
    Feb 25, 2012 at 18:25
  • @bluexrider Note that the thermal switch that would run the blower isn't in the thermostat, it's part of the furnace.
    – BMitch
    Feb 25, 2012 at 20:10
  • I found a circuit breaker thrown in the panel. I reset it and the two 30 amp fuses in-line with the heat-pump blew out. I replaced them and reset the circuit breaker again and the same thing happened.
    – bluexrider
    Feb 26, 2012 at 18:37
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Probably just a stuck relay. Happened to me on my HVAC blower motor this Summer.

There will most likely be a main control board for the furnace and the relay is probably there. As far as testing, you'd have to remove it and supply the voltage that the furnace does, to the right pins, while testing the other pins for continuity/disconnect. You'd need info specific to your furnace/relay to do that (as well as knowing and following the appropriate electrical safety rules) I wouldn't just replace it without testing as they can cost $35+.

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    Could you elaborate on how to test and resolve this?
    – Steven
    Feb 23, 2012 at 21:40
  • Where would this item be and should I replace it as good measure?
    – bluexrider
    Feb 24, 2012 at 0:06
  • There will most likely be a main control board for the furnace and the relay is probably there. As far as testing, you'd have to remove it and supply the voltage that the furnace does, to the right pins, while testing the other pins for continuity/disconnect. You'd need info specific to your furnace/relay to do that (as well as knowing and following the appropriate electrical safety rules) I wouldn't just replace it without testing as they can cost $35+. Feb 24, 2012 at 12:41
  • 2
    @BrianKnoblauch I added your comment into the answer, could you please delete the comment. For future reference, if you want to add information to an answer/question they are always editable (just click edit at the bottom of the answer/question, add the info, and click save edits).
    – Tester101
    Feb 24, 2012 at 13:10

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