Heating and cooling problems.

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burnsrv

New member
Joined
Jun 10, 2021
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4
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48170
I have a 2007 Jayco Bunkhouse. The air and furnace stopped working. The furnace will cycle on approximately every 65 minutes. It will run if the propane is on, otherwise it will shut off. It will cycle in this fashion even with no thermostat. Air conditioner will not turn on at all. Also the fuse-able link blows the fuse immediately when hooked to the battery. Power has two cables to the battery one fused and one without a fuse. I am not sure where the fused cable terminates.
 

donn

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Nov 8, 2009
Posts
4,358
Furnace REQUIRES propane and 12VDC to work. AC REQUIRES 120VAC to work. Turn any or all of those off and stuff will not work.
So, based on what you said the furnwce acts normal when you turn the gas off. You did not mention whether your connected to shore power, so Im guessing no to that too.
 

burnsrv

New member
Joined
Jun 10, 2021
Posts
4
Location
48170
Have you tested the battery?
The battery is holding a charge. The positive side has two cables. One has a fuse. The fuse blows immediately upon being connected. Everything else in the RV works. It is puzzling because of the fuse and the furnace cycling even if the thermostat is removed.
 

donn

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Nov 8, 2009
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4,358
If your blowingma fuse you either have the wrong size fuse installed or you have a short. What size fuse is blowing?
 

burnsrv

New member
Joined
Jun 10, 2021
Posts
4
Location
48170
If your blowingma fuse you either have the wrong size fuse installed or you have a short. What size fuse is blowing?
It is a green blade style inserted into the battery cable and is 32A. I am not sure where it leads. But I will have to follow it. I am pretty sure it is connected to the heating/cooling issue. The Jayco thermostat does not have batteries like most thermostats I am familiar with. I suspect that the power to the thermostat is related to that fuse-able link.
 

Gary RV_Wizard

Site Team
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Feb 2, 2005
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73,527
Location
At our Silver Springs FL home
The thermostat will be powered from the house 12v system - no need for its own batteries. If the thermostat handles both heating and cooling, it probably gets its 12v power from the a/c unit. If it's heating only, then it likley comes from the furnace.
 
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