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The 3A fuse blows on the main board when the bottom door switch is pushed

I have a GMH 951155DX furnace. The heat cycle works okay. When I switch to A/C and push the bottom door switch the 2A fuse on the main board blows. I put a new main board in. I removed the condensor two wires, I removed all the wires and plugged them one at a time, when I plugged the wire into the rollout sensor, it blew the fuse. I get 6 blinks, which says "bad fuse" or "rollout sensor open" I disconnected the wires to the thermostat, hooked them up one at a time, when I hooked the red wire the fuse blew. I replaced the thermostat, no help. This is a new installation, it did work for a while, I had a freon leak, when I repaired that, then the condensor would not come on, that is when I found the fuse blown.

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  • Serv-Tech Aug 13, 2008

    I did remove the thermostat wires at both ends, did a continuity check, all okay. I tried hooking up the roll-out sensor, with the thermostat wires off at the thermo. touched the red to the yellow to turn on the condensor, it blew the fuse. As long as I have the "roll-out sensor" hooked up it will blow a fuse. I checked the 24v transformer, 115 ac in and 27v out. With that out of the system no fuse blow, but no action either. With the thermostat out of the system no fuse blow, but no action either. I am at a loss. thanks for your help

  • Serv-Tech Aug 17, 2008

    I found the problem. When I repaired the leak, the heat passed through the plenum to the thermostat wire, melted the insulation and caused a short in the yellow wire, when 24v was put on it, the fuse blew. a piece of tape fixed the problem when we found it. Interestilgly enough an ohm test of the thermostat wires did not reveal the problem, only a look at the wire found it. thanks for your help.

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There is definitely a short in the 24volt(low voltage) system. You have done the right things so far. I would begin by physically inspecting the wires for damage and performing continuity checks for each wire as well as each wire to the furnace. These checks should be done with a meter and disconnecting each wire at both ends.

Sometimes there is a very small bare spot touching the furnace or ductwork. You can diagnose this by checking continuity from the wire to the ductwork. If there is continuity then that is your problem.

Posted on Aug 13, 2008

  • Don Berry Aug 14, 2008

    Try checking the continuity on the 2, 24volt wires that go to the condenser unit. The problem may be in this part of the system. Check these wires as you did the thermostat wires before. The problem may be in the wires themselves or the contactor relay located in the condenser electrical panel. give that a try.

  • Don Berry Aug 18, 2008

    I am glad you found it. That is one of the most difficult shorts to locate. Good Job!

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