Both thermostats have no power

[tspang11]

Am cold! Neither thermostat has power. Checked all breakers and fuses.

What else can I check?

[travelin' texans]

IIRC both thermostats have a fuse either in-line or under the cover. Seems odd though that both would quit at the same time? Did the wires get crossed on your batteries at some time to possibly blow fuses?

[tspang11]

Thanks for responding. Have checked the fuses inside the thermostats and all are ok. Called the RV place that checked out the electrical for me. They said to look at the control panels. So I both have been checked out and all wires are secure. I am very puzzled.

[hoosierguy]

Originally Posted by tspang11

Thanks for responding. Have checked the fuses inside the thermostats and all are ok. Called the RV place that checked out the electrical for me. They said to look at the control panels. So I both have been checked out and all wires are secure. I am very puzzled.

I assume you have 12 VDC lights okay. Recommend that you check all of the connections in the battery compartment for loose connections; especially check the frame grounding connection on the back side of the battery compartment. Many of the folks have had issues with loose connections.

Once you have checked the battery compartment, and if still no resolution, pull the fuse panels and check for loose connections on the back side of those panels.

Hope this helps.

[tspang11]

Thank you. Will check the battery compartment and get back to you.

[tspang11]

Forgot to mention that everything else in the RV is working perfectly.

[r time soon]

Are your breakers to the A/C's themselves turned on?? Double check your 110v breakers. They might look ok, but might be tripped. Turn them all the way off and then back on. I can't remember if the A/C themselves power the thermostats. Worth a try


Chris

[hoosierguy]

Originally Posted by tspang11

Forgot to mention that everything else in the RV is working perfectly.

Since your referred to both thermostats, I assume you are trying to run the A/C heat pumps. Have you tried to switch over to the furnace only mode to see if the furnace will run?

[tspang11]

Problem is now resolved. Learned a valuable lesson. The fuses in the thermostats themselves were what was bad. Visual inspection of the fuses is not an effective way to determine if they are bad. Took the RV to the shop and they quickly reaolved by testing the fuses with a voltmeter and they were found bad.

Now, I will always have spare fuses and a voltmeter permanently stored in the RV!

Thanks for all the great suggestions.

[travelin' texans]

Still coincidental that both were blown without some sort of short somewhere. Did they offer any explanation as to why or how?

[tspang11]

Root cause will most likely never be known. They indicated that my onboard generator may have created a spike that blew them both. I had requested my 12 volt system be checked out and suspect something happened while the worked on it. Never had a generator surge issue before and had Iober 100 hours of use.

[Jim & Mary]

It would be nice to know what circuit (s) feed the thermostats. I'm sure it must be one of the fused 12V circuits in the power panel, but if your wiring legend is anything like mine it would only be a guess. Enough of a short to blow both is highly unusual, and not blow the upstream circuit fuse. By the way, when I found out my curb side awning wasn't working, I didn't suspect a fuse as the blown fuse indicator light wasn't lit. Don't know why that didn't happen, but it was a blown 15A fuse caused by me taking down the basement wall.

[atom ant]

Your gen power would be filtered through the converter to get to 12V. I would highly doubt the generator caused it. Lightning maybe - lightning loves thermostats - welded my folks right to the wall once.