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Thermostat keeps blowing fuses

The airconditioner (coleman rooftop RV) keeps blowing 4 amp fuses, sometimes it will work for a while and then it will blow another fuse. I have had this problem since 1997. I have replaced the Mach thermostat once already. Please respond.

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There is a short in one of the thermostat wires. The fuse is triggered on the low voltage side of the unit. Replace the wires.

Posted on Feb 09, 2010

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  • Ed Five Dec 09, 2013

    Where is the low voltage fuse on a rooftop gas heat unit.

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I have a duo therm model 57915531. i have checked the breakers all the fuses and the thermostat. i have found a 3 amp fuse in the control panel of the roof unit. this fuse was blown. i replaced it and it...


That unit has a thermostat I believe and 12 or 24 volts to power it. The 3 amps tells me it may be either line or low voltage, see manual. the fuse blows due to a short in the control circuit, a transformer if low voltage.

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Aug 21, 2009 | Dometic Rooftop RV Air Conditioner

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Rf top ac on rv keeps blownig the 3 amp fuse


The 3 amp is 12 Volt protection for the control board. If that fuse is blowing instantly, then you have a short in the 12 Volt system somewhere. More than likely it is somewhere between the Thermostat and the control unit. Check to see if you have 12V at the thermostat. If so, then disconnect the red wire from the thermostat and the red wire at the control unit. At the control unit side, use an Ohmmeter to see if you have continuity with ground. If so, that wire is the culprit. If not, reconnect the red wire and continue to the next wire. Do this until you find the wire that is shorted to ground. Of course, the ground wire will not be checked.

Hope this helps,

Jeff

Jun 29, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Thermostat


Several things cause fuses to go. But you ace in the hole is that it works for sometime before it goes out. This suggests that a relay or contactor is not pulling in as it should. I would try replacing the fan relay (if so equipped) and definitely the compressor contactor. If either of these try to pull in and are off center internally the result can be blown fuses intermittently.

DO NOT GO ABOVE 5 amp fuse or you may burn out the transformer.
The other things that can cause a blown fuse intermittently where your describing (although less likely unless subject to rodents and or high or low voltage spikes)
1 a temporary short in the control wiring (wire to or from the thermostat).
2 A short intermittent on the control board (if so equipped)
3 A relay on the control board or the SS circuitry is not operating with in design parameters.

I would really like to know what you discover the problem is.

If this helped you understand your system or problem please rate me as high as you can and thank you for using fix ya. Good Luck.

Mar 27, 2009 | Coleman Mach III Air Conditioner

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