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Old 06-26-2022, 04:23 PM   #1
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Help with power

Hi all,

Need you help. Just set up the camper and the thermostat wonít light up. Checked the fuses and they are fine. Only found one GFCI breaker in the bathroom (looking to see if there is another). The thermostat is a Domtic. Any ideas? Canít even turn on the fans, little alone the A/C.

Here are two pictures. Can we trick the thermostat to turn on maybe?
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Old 06-26-2022, 04:53 PM   #2
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Hi all,

Need you help. Just set up the camper and the thermostat wonít light up. Checked the fuses and they are fine. Only found one GFCI breaker in the bathroom (looking to see if there is another). The thermostat is a Domtic. Any ideas? Canít even turn on the fans, little alone the A/C.

Here are two pictures. Can we trick the thermostat to turn on maybe?
Thermostat runs on 12-volts. Do your other 12-volt accessories work like lights, exhaust fan, etc.? Battery voltage good?
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Old 06-26-2022, 04:58 PM   #3
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Look closer on the thermostat. I recall reading of another fuse on the back side of that thermostat. I hope my memory is still functioning.
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Old 06-26-2022, 05:18 PM   #4
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Thermostat runs on 12-volts. Do your other 12-volt accessories work like lights, exhaust fan, etc.? Battery voltage good?
Yes everything else works accept the thermostat and the awning.
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Old 06-26-2022, 05:26 PM   #5
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Yes everything else works accept the thermostat and the awning.
If all fuses look okay it could be a bad connection or ground somewhere. Do you have a multimeter to test if any voltage is coming to the T-stat? Or to check continuity to ground. I would check those wires right at the terminals identified at the thermostat. And double-check the fuses, sometimes they can be bad without "looking" blown.
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Old 06-26-2022, 09:58 PM   #6
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Look closer on the thermostat. I recall reading of another fuse on the back side of that thermostat. I hope my memory is still functioning.
Canít see any other fuse. Is there a reset for the thermostat or the air conditioner?
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Old 06-26-2022, 11:59 PM   #7
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If all fuses look okay it could be a bad connection or ground somewhere. Do you have a multimeter to test if any voltage is coming to the T-stat? Or to check continuity to ground. I would check those wires right at the terminals identified at the thermostat. And double-check the fuses, sometimes they can be bad without "looking" blown.
The weird thing is that none of the fuses in the fuse box appear to be for the AC. Is there another location for fuses other than near the converter?
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Old 06-27-2022, 08:54 AM   #8
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The weird thing is that none of the fuses in the fuse box appear to be for the AC. Is there another location for fuses other than near the converter?
Tha A/C unit itself runs on 120-volts AC power and has a breaker in your power center but the control for the A/C unit comes through the thermostat which operates on 12-volts. The thermostat sends a 12-volt signal to the A/C unit to turn on. On many units the fuse for the furnace provides the 12-volt power to the thermostat which controls both the heating and cooling of the unit. Check the fuse for the furnace, it runs only on 12-volts. Many of the RV furnaces have a small switch on the furnace itself that acts as a circuit breaker, you may have to find yours and turn it off then back on and see if that restores power to your thermostat.
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Old 06-27-2022, 02:21 PM   #9
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I cannot find any switch or fuse for the furnace, and like everything else with this trailer, all the manuals are generic and not model specific. And the AC doesnít even have a manual. Any idea on how to get the manual for the specific furnace and AC unit? And where I would find the model numbers for each?

I am in a Jayco Jayflight SLX 2018 324BDSW.
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Old 06-27-2022, 02:33 PM   #10
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Also while I am at itÖ and maybe a stupid question. Every video online that has the same thermostat has and on off switch for the thermostat on the wall. Like this video: https://youtu.be/oMXQ3LjHtvM

Is this always the case, and if so, where else would it be located?Ö because I do not seem to have one.
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Old 06-27-2022, 05:36 PM   #11
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Well, finally got the multimeter and measuring no power at the thermostat, furnace or AC on the 12 volt lines. Anyone know where I can get a wiring diagram for my specific trailer?
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Old 06-27-2022, 07:18 PM   #12
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Well, finally got the multimeter and measuring no power at the thermostat, furnace or AC on the 12 volt lines. Anyone know where I can get a wiring diagram for my specific trailer?
I contacted Jayco and had them by email 2 days later.
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Old 06-27-2022, 07:24 PM   #13
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Tha A/C unit itself runs on 120-volts AC power and has a breaker in your power center but the control for the A/C unit comes through the thermostat which operates on 12-volts. The thermostat sends a 12-volt signal to the A/C unit to turn on. On many units the fuse for the furnace provides the 12-volt power to the thermostat which controls both the heating and cooling of the unit. Check the fuse for the furnace, it runs only on 12-volts. Many of the RV furnaces have a small switch on the furnace itself that acts as a circuit breaker, you may have to find yours and turn it off then back on and see if that restores power to your thermostat.
X2, the DC fuse for the thermostat should be at the furnace. That even goes for most residential HVAC's.
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