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Old 05-18-2016, 11:20 AM   #1
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No Power to Tstat

2000 Carriage Carri-Lite
Suburban SF-42 furnace.
Plugged in to 50amp shore but no power to AC nor Furnace. Tested at Tstat and no 12 Volt power. Ran a jumper 12 Volt wire to Tstat and furnace and AC will work.
Does the 12volt power to Tstat come from the furnace? The wire I jumped is the red wire on the TSTAT and I believe that red and white wire come from the furnace.
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Old 05-18-2016, 11:31 AM   #2
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Quote:
Originally Posted by bjrobinette View Post
2000 Carriage Carri-Lite
Suburban SF-42 furnace.
Plugged in to 50amp shore but no power to AC nor Furnace. Tested at Tstat and no 12 Volt power. Ran a jumper 12 Volt wire to Tstat and furnace and AC will work.
Does the 12volt power to Tstat come from the furnace? The wire I jumped is the red wire on the TSTAT and I believe that red and white wire come from the furnace.
I suspect you have a bad/blown fuse in your "12V house fuse panel".
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Old 05-18-2016, 02:07 PM   #3
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Fuses

All fuses on the 12 volt hub tested good. I didn't see on labeled for the Tstat or Furnace tho.
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Old 05-19-2016, 08:36 AM   #4
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All fuses on the 12 volt hub tested good. I didn't see on labeled for the Tstat or Furnace tho.
bjrobinette
In addition to the fuses in the "12V hub" doesn't your 2000 Carriage Carri-Lite have 12V fuses in a HOUSE POWER FUSE PANEL?

In my coach there's a HOUSE POWER FUSE PANEL located in an upper bedroom cabinet.

The 9 fuses in that panel are labeled as follows:
1.) Living Room lights (20A)
2.) Kitchen Lights (20A)
3.) Bedroom and Bathroom Lights, (20A)
4.) Power Vents (15A)
5.) Water Pump and Monitor Panel (15A)
6.) Water Heater (10A)
7.) Furnace and Thermostat (15A)
8.) TV Antenna Amp and drivers console cigarette lighter socket (15A)
9.) Refrigerator (5A)

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Old 05-19-2016, 02:32 PM   #5
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I just had this same experience. I am currently camp hosting in a GA State Park and had a camper with a new (to him) rig come in with exactly the same symptoms as yours - no power to T-stat and furnace and ACs would not come on.

I won't belabor all the trouble-shooting we did but the result was that we found that the owner had inadvertently turned off a remote switch mounted on the furnace itself. We had to take off the external panel to the furnace (six screws). But with that panel off this little black toggle switch was plainly visible and in the off position. Flipped it to on and and everything powered up, the thermostat came back to life and the ACs cranked up immediately.

So if your fuses are good, you know you have power to the rig and everything is working with the exception of the HVAC then there is a good chance that a switch has been flipped, or maybe burned out and possible that it is associated with the furnace.
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Old 05-20-2016, 01:38 PM   #6
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I have been suspecting that little switch, it was stuck when I turned it off and then back on. I will test it this eve and post the results.
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Old 06-01-2016, 08:01 PM   #7
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I found the problem, or at least one of the problems then I shorted out the Thermostat with my jumper wire. The 12v wire didn't ohm out so I ran a new wire for the 12v. I'm also looking for an economical tstat if someone know of a good replacement.
Thanks for all the help and suggestions.
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