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Old 08-05-2018, 07:29 PM   #1
Join Date: Apr 2014
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Coleman Mach Digital Thermostat - Setting Changes to default

Have a 2018 Eagle 321RSTS that we have a Coleman Mach Digital thermostat.
We have had the same thermostat in 2 other fifth wheels.

In current trailer if I set the heat temperature to 65, randomly the thermostat will reset to it's default of 72.

Tried a second thermostat and same result.

Talked to Coleman and they claim the only way this can happen is if voltage to thermostat drops below 10.4V.

I am connected to shore power when this occurs.

When check voltage at thermostat it is at 13.6V.

Any suggestions to correct.
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Old 08-06-2018, 09:49 AM   #2
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I had the same problem with that thermostat and was also told it was due to a voltage drop. I read a post somewhere that the problem is that the thermostat power comes from the furnace and sometimes the voltage drops. I added a 15 amp fuse to an empty space in the electrical control panel and ran a wire directly to the thermostat. The thermostat works perfectly now.
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Old 08-06-2018, 10:39 AM   #3
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I would return that stat and put old one back on!
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Old 08-06-2018, 04:09 PM   #4
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I just installed a two digital stats. I'll have to see if the one wired to heat it behaves the same. Now I'll know the issue. Thanks for posting.
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Old 08-12-2018, 11:07 AM   #5
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You can replace it with a residential non-programmable digital thermostat. If it has its own batteries the voltage will not have any effect on it. There are many posts online of what to get and how to do it.

Here is a Youtube video:
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Old 08-13-2018, 11:47 AM   #6
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Another Jayco employee who most not own a hole saw!Just beat them holes through LOL.Bad thing in Phoenix would be changing batteries all the time.Does look cool. Thanks
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