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Fuse blowing on tappan air handler

Our tappan air handler using a 5 amp fuse that keeps blowing causing the thermostat to shut off. THe handler stills blows air but the heating coils cannot kick on without the thermostat. The thermostat is tied in with the air conditioning on the breaker box and the air handler is on a seperate breaker. We have replace the 5 amp fuse several times and it has blown each time. We have shyed away from looking at the air conditioner unit as a problem but we aren't sure what to look for. Do you have any suggestions before we seek professional help?

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  • micah_hudson Jan 24, 2009

    That answer is very helpful and sort of confirmed what we had thought. We keep going back to the ac to look at the wires going into it because they look worn a little. We'll take a better look. THank you very much for your help.

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  • Master
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Most of the time its out by the ac unit . you have a shorting thermostat wire .. the outside unit has a large wire thats 240v and a small one that 24v thats the one you want to look at . look for bare wires , look where it goes into the wall , thats the common place . "critters" love to chew thermostat wire . so take a look . .....please rate this answer , i need votes . thanks

Posted on Jan 24, 2009

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  • Master
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There is something shorted in the air handler. It could be a heater element, assuming they are in the air handler (and they usually are.).


Posted on Jan 24, 2009

  • Mark Egan Jan 24, 2009

    If the smaller wires at the outside unit use only 2 conductors (it could be 2 wires inside of a sheath, and both are used, or 4 wires inside the sheath, and 2 are used) then the problem is inside the house as the blower will not run without 24 volts to make the heat sequencer and fan relay energize.

    Turn the power off to the inside unit, and remove the panels covering the electrical components. Note whether there are any burned wire connections, a common problem with electric heat furnaces. Those need to be repaired, and there is a chance that one or more may be contacting ground. What's weird is the fan continuing to run without power from the 24 volt transformer. It's going to take some investigation to determine what the failure is.


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