furnace blowing fuses

[Camping Rookie]

AC was working fine but when I changed over to the furnace, the 15 amp fuse blew and the thermostat is out. Even when the main breaker is off when the fuse is replaced it blows immediately.

I have a Forest River 2019 Sandpiper 5th wheel

[SeaDog]

welcome to the forum its a great place to get your questions answered. The main breaker is for 110V electricity and has nothing to do with the furnace. The furnace gets its power from the 12V system. Sounds like you have a short in the system and need to start tracing the wiring for the short. JMHO

[5picker]

Welcome to the forum, I see it is your 1st post

1st things 1st... while you did mention your R/V model, when asking questions about specific things (like the furnace in your case), it is always best to include the make/model of the furnace and the thermostat. Not all R/Vs have the same stuff in them. There are many furnace models and types of controls. (thermostats)

2nd... as mentioned, the A/C unit is run by 120v and the furnace is 12v. Two different systems. Breakers for the A/C will have nothing to do with the fuse for the furnace blowing.

You are going to need to trace and test the 12v circuitry for the furnace from the power distribution box (where we assume the blown fuse is located) to the furnace.

Do you own a multimeter and know how to use it?

To add to the mix... some A/C units and furnaces are controlled by something other than just a wall thermostat. Units with Firefly, Precision Plex and LCD digital controls are often yet a horse of another color.

Give us some additional information and we can better help you.

[bikendan]

Moved thread from the General Community Discussion section to the Electrical and Charging Systems sub-forum.

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