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Old 09-09-2016, 09:25 PM   #1
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A/C and fan inop..help!

Camping this weekend and the air conditioning and fan are not working. I installed a Honeywell thermostat last time we camped and it worked then. I swapped the mechanical Coleman thermostat back in but the same problem persists. I probed the A/C breaker and I'm getting power there. What's do I look at next?
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Old 09-09-2016, 09:30 PM   #2
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Are you getting 12v to the thermostat?
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Old 09-09-2016, 09:32 PM   #3
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Quote:
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Are you getting 12v to the thermostat?
Just checked white/blue (-) and red but getting nothing.
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Old 09-09-2016, 09:35 PM   #4
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Check the 12v fuse for the a/c & furn
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Old 09-09-2016, 09:48 PM   #5
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Fuse panel says fridge and furnace are on the same fuse but the fridge runs on gas. No fuses visibly blown.
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Old 09-09-2016, 10:34 PM   #6
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I can't determine why the red wire has no voltage or where it goes . Any harm in running a hot 12v jumper wire from a light to the thermostat just to get it voltage or an I asking for trouble?
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Old 09-10-2016, 12:46 AM   #7
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I think I read on here once before there may be an inline fuse on the thermostat wire somewhere near the thermostat. I may be wrong but worth a try...
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Old 09-10-2016, 06:54 AM   #8
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I pulled lightly on that red wire but found no fuse in the wall cavity. I ran a jumper wire from an adjacent ceiling light to to thermostat and have A/C now but I still need to trace that wire...maybe to the furnace?
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Old 09-10-2016, 09:17 AM   #9
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Maybe a continuity test from the thermo to the fuse to verify a break in the wire.
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Old 09-10-2016, 10:04 AM   #10
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Quote:
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Maybe a continuity test from the thermo to the fuse to verify a break in the wire.
Unfortunately that wire doesn't run directly to the fuse panel.
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