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Old 06-17-2019, 09:58 PM   #1
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Brand: Thor Motor Coach
State: California
Posts: 5
THOR #13143
Heater

Hello from Mammoth Lakes. When setting the control to furnace, the air conditioning ceiling unit comes on. Can anyone help.
Thank you.
JKeith
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Old 06-17-2019, 10:07 PM   #2
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Brand: Thor Motor Coach
Model: 2016 Axis 24.1
State: Florida
Posts: 2,211
THOR #1765
You don’t have your coach listed, but it Looks like you have a wire misconnected or crossed either at the thermostat or the A/C controller located in the A/C unit above the couch. Do not trust the wire colors to be the same at both the thermostat and A/C controller. Tech I had in to look at mine said “the wire bundle is the same from the thermostat to the controller”. Mine was not. Not the first time I have run into this.
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Old 06-18-2019, 12:32 AM   #3
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Model: ACE 27.1
State: Florida
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THOR #7035
So what has changed between December when you had it working and now?
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Old 06-18-2019, 12:39 AM   #4
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State: Colorado
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THOR #13741
Not sure what unit you have but we needed to change the fan from low or high to auto. Then the AC didnít come on when the furnace came on.
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Old 06-18-2019, 12:47 PM   #5
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Brand: Thor Motor Coach
Model: 2013 ACE 30.1
State: Alberta
Posts: 921
THOR #2631
On basic RV thermostats usually the wiring terminals are labelled. The Y terminal should be connected to the air conditioner control relay in the ceiling plenum (call for cooling); the W terminal should be connected to the furnace (call for heat). Sounds like the two wires are reversed? Note the G terminal usually controls the fan speed for the air conditioner and typically connects through a fan speed switch to connect to either a low or high speed control wire up to the air conditioning controls in the ceiling plenum. Did someone do the analog to digital thermo conversion recently?
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Old 06-18-2019, 01:10 PM   #6
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THOR #1765
Quote:
Originally Posted by javelin View Post
On basic RV thermostats usually the wiring terminals are labelled. The Y terminal should be connected to the air conditioner control relay in the ceiling plenum (call for cooling); the W terminal should be connected to the furnace (call for heat). Sounds like the two wires are reversed? Note the G terminal usually controls the fan speed for the air conditioner and typically connects through a fan speed switch to connect to either a low or high speed control wire up to the air conditioning controls in the ceiling plenum. Did someone do the analog to digital thermo conversion recently?
If this is a problem with a new coach (only 5 Posts and he doesnít say) it could also be those wires are switched at the A/C controller. Since Thor does not seem to always use continuous wires from the thermostat to the controller, it is easy to mix up the wires at the controller if they used different color splice wires,
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Old 06-18-2019, 01:49 PM   #7
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Brand: Thor Motor Coach
Model: Siesta 24SS
State: California
Posts: 199
THOR #12698
Make sure you are only turning on the furnace and not the HEAT pump which circulates through the roof air unit. If you turn on the heat pump, the roof unit takes several minutes to heat up which feels like the air conditioning is on.
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