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Transformers and fuses keep blowing

My Goodman heater has had 2 transformers and 4 fuses replaced in a month and the technicians can't figure out why the transformers keep blowing. One time it blew the transformer and not the fuse another time it blew a fuse one day and I had that replaced and then it blew the transformer the next day. All the wires have been tightened each time and we still can't get any long time resolution. Please help. Tonya

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Re: Transformers and fuses keep blowing

If you are where it's warm and you are using air conditioning, have the technician check the coil in the relay in the outdoor unit. I replaced 2 transformers before I figured out the coil was shorted out and drawing too much current.

Posted on Jan 04, 2008

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You can either change the wires going to the black and white wires from the main power supply, or try to switch the black and white wires on the primary side of transformer.

Oct 06, 2015 | Goodman Heaters

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I have a intertherm electric furnace model #FEH=015HA=03 w/ an A coil for my AC. Date code 870902 . It burns out the transformer. It did it about a month ago and it was replaced by a certified electrician....

There is a short in the low voltage wiring somewhere...this type of thing can be very hard to track down and is probably a wire rubbed through somewhere...
Have the electrician install a 5 amp. automotive type fuse in the low voltage wiring right after the transformer to keep from burning up anymore transformers...I would do this even if you think you find the problem...


Mar 23, 2011 | Heaters

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I hooked up a coleman electric furnace to a janitrol condenser heat pump . The t-stat wires on electric furnace are red white green and yellow. I added a blue for common off of transformer for digital...

Hi, first of all you need to get a hand full of 5 amp auto type fuses and install one on the hot leg of the 24 volt secondary side of the transformer. Just use 2 female crimp on connectors and put the fuse in the middle of the hot wire. Saves $$$$ on replacing transformers when you have a dead short on the low or high voltage side of any transformer, just a trick of the trade, food for thought. Fuses are much cheaper. On your electric unit, you may not need the common on this to operate the digital stat if it has batteries. This may be your dead short. On the Janitrol condenser, the red is your 24v as you no. They are using blue in place of yellow for cooling. Red is hot, W is heat, G for fan, and blue is cooling on this Janitrol. Keep in mind you are connecting to a heat-pump also, so make sure the wiring is correct. Are you installing this for secondary Heat?? More then likely, the blue common you have added is the dead short as the janitrol uses the blue for a cooling relay in place of yellow. Anyway, use the 5 amp fuse, trick of the trade to save on the transformers. Please keep me posted, as I know know you have this under control.
A/C, Heating, & Refrigeration Contractor. Good Luck!

Feb 09, 2011 | Coleman Heaters

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My air handler is blowing the 3 amp fuse on the curcuit board. what does it control

Its not what it controls but what it protects. It protects
the transformer. Disconnect the thermostat wires and mark where they go. Replace the fuse and turn the power on. If it does not blow the fuse the problem is in
your thermostat or thermostat wires.

Jun 30, 2010 | Goodman GMS80453ANA Open Flame Mid-Size...

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you obviously have an intermittent low voltage short. I would visually inspect all low voltage wiring to try to locate the problem. Pay good attention to the limit circuit, I have seen wires melted to the inducer housing before causing this problem. also, install a 3A fuse inline till you find the problem to save on transformers.

Nov 25, 2008 | Dayton Heaters

1 Answer

Goodman Gmp150-5

sorry if you disconnect all the low volt wires from the board and it still blows fuses, th board is gone.

Oct 31, 2008 | Goodman GMS90703BXA Heater

4 Answers

Goodman gmp075-3 led blinks 5 times

I Also have the same and other problems with my furnace model # GDS80703AXBB. First the LED kept blinking 4 times and I too jumped the primary limit, that didn't kelp. After several attemps I moved the wires going to the circut board and everything starting working again. After a week It stopped working again, so I pulled the plug out of the circut board checked all wires for for a bad connection plugged it back in. Now the LED blinks 6 times again I move the wires. Then the LED blinks 3 times. Then the transformer burns out. I have burned out 2 transformers and I have ordered a new circut board.

Oct 22, 2008 | Goodman GMS90703BXA Heater

2 Answers

Keeps blowing the fuse.

In more rare scenarios the 24v activated fan relay that is soldered to the circuit board can cause this same problem. I agree with Therinnaiguy, If the fuse is blown 90+% of the time there is a short in the 24 volt control system.

Jun 09, 2008 | Goodman GMS90703BXA Heater

3 Answers

Goodman GMS90703BXA Heater/AC - 3 Amps Fuse blows

This fuse is used on the low voltage side of the furnace. All 24 volt controls operate thru it. You may have a short in your thermostst, thermostat wire or even a bad transformer. After replacing the fuse, inspect the wiring in the cabinet as well as the wire heading toward the thermostat for damage. If you find none, check the thermostat for loose wires or contacts. If all else fails, jump out R and W with a small jumper temporarly at the furnace and see if the unit runs. You will have to tape the door switch closed to run it with the panel off. Remember, this will keep the furnace running 100% of the time until you disconnect the jumpers. Not a solution, just a test! If it runs flawless, you have a bad thermostat or wire. Diagnosing a transformer is for a technician.

Aug 12, 2007 | Goodman GMS90703BXA Heater

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