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Tempstar Furnace blowing 5 amp fuses

My tempstar furnace (Board is HK42FZ0182006) has blown 5 amp fuses intermittently for about a year. I had a tech come in December and he replaced the transformer, but he also left the wires to the condenser undone. I hooked those back up and it started blowing fuses immediately if I use the fan switch on the Honeywell TH1110D thermostat. I tested the wires for shorts with an ohm meter and they check out. I also tried disconnecting the t-stat wires in the thermostat and I can run through all of the functions (Fan, Heat and AC) by jumpering the terminals directly.. The fuse doesn't blow when I do this (at least for the couple of minutes I've run each mode).

I tried replacing the thermostat with a Honeywell programmable (that didn't use the common line) and it blows the fuse the instant I turn power back on at the air handler.

I put the old Honeywell TH1110D tstat back on and it seems to work fine as long as I leave the G (fan) wire disconnected.

I'm stumped!! Any idea's?

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7wires? wtf with that! how many things you got runnin there. you need to give way more info to get a decent reply.

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SOURCE: Furnace start buts shuts off

It sounds like you have an obstruction in the exhaust vent. Thats why when you bybass the pressure switch it runs ok. Steve

Posted on Dec 21, 2008

  • 1 Answer

SOURCE: tempstar dc90 furnace will not light

Possible solution would be to push the reset button if you haven't already. I have had to do it twice on my dc90 in the last week.

If you look at the glass where you can see the combustion chamber, the glass is oval, follow the long axis of the oval toward the 'top' of the ignition chamber (my unit is laying down, with the blower on the west end and the combustion chamber on the east, as I am facing south). On top of the chamber are two protected spade clips. In between them is the reset. Make sure that the unit is off, press the button, and fire it back up.

Posted on Feb 20, 2009

Therinnaiguy
  • 1420 Answers

SOURCE: 5 amp fuse continues to blow on control board for

You have a short on the 24 volt side of the unit. Check the thermostat wire for signs of pinching or direct short.

Posted on Oct 17, 2009

SOURCE: fuse blow each time I turn on air check for

disconnect the thernostat wires from the control board. Put a jumper wire between R & G put door back on and turn on power. Blower motor
should run, if it blows the fuse then you have a direct short between R &
G at the board. Do this with R and W(heat) and R & Y(cool).

By disconnecting the thermostat wires and reinserting them make sure that they do not touch when inserted into each terminal. If it still blows
that little 3amp fuse when jumpering between each sequence as mentioned above, then I think your board is bad. When Jumpering out the Y terminal you will have to have the AC wires still hooked up. If it
blows the fuse in that sequence. Disconnect the wires out at the condensor.

You mat have a bad contactor at the outdoor unit.

Posted on Jul 16, 2010

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