Coleman thermostat shoots to 22!

[Brightwhite]

Weird issue with our month old Coleman rv comfort digital thermostat, end of the night we set it to 16/17ish. I'll wake up a couple hours later and it set itself to 22?!? Thought I was going crazy but I finally seen it happen this morning. Set it to 18, come back 30 seconds later and it's at 22!

I pulled the fuse this morning, didn't do anything. Thought I'd ask around here before I exchange it.

Anyone see anything like this?

[norty1]

No but I would freeze if I slept that cold.

[curver900]

Originally Posted by norty1

No but I would freeze if I slept that cold.

ROFL in Canada that is probably HOT!!

[Brightwhite]

Not hot enough to melt the igloo

[RogerR]

You might check your voltage at the thermostat and/or your batteries.

Or maybe it is just time to replace?

[Camper_bob]

Originally Posted by RogerR

You might check your voltage at the thermostat and/or your batteries.

Or maybe it is just time to replace?

+1

The electronics in that T-stat are controlled by the 12V system; if you have any problem with that system and the stat loses 12V power, it will reset to "default". Mine is 72F (roughly the same as your 22C); the other night I cycled the 12V trying to trouble-shoot something and forgot the t-stat would reset. I came back a few hours later and the AC had been running the whole time trying to cool the rig to 72.

Worse yet, my rig is equipped with 2x 11,000 units, so the one main unit (the other still has the manual stat) was trying to get the whole rig down to 72. Ambient was in the low 90s.

ETA: Sorry, I forgot to add that the first thing I would do is check the connections on the back of the t-stat. They use some pretty sloppy wire nutting on those, and something could've just wiggled loose. Beyond that, I don't envy you having to troubleshoot intermittent 12V problems; I have a feeling I'll be in that boat soon

[SloPoke]

Our T-stats lose the setting when the power is lost to them. When the power is restored, they default back to a specified temperature (cant remember what that is)

[DNelson]

As others have said the Coleman digital reverts back to the default setting of 72F/22.2C. I read that the problem was Jayco wired the thermostat power to the heater and when the fan turned on the 12 volt power dropped so low the thermostat reset. I ran a separate 12 volt line to the thermostat and still had problems. Many have switched to a AA or AAA battery powered house thermostat to avoid the issue. I switched our Coleman digital thermostat to a battery powered Lux brand and it works perfectly. Our Jayco is a 2018 and my understanding is that Jayco has switched to a different wiring system and the conversion may not work anymore.


There are a lot of threads here about switching to a battery operated thermostat. The wiring is simple if it is the older system.


Good luck,
Dwayne

[Brightwhite]

Thanks everyone for the info! Makes total sense now, I'll confirm by killing the breaker quickly and see if it goes back to 22. Sounds like it's time to sweet talk Amazon to take it back, 3 days over the their return policy!