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Old 04-08-2019, 07:54 AM   #21
dfb
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Your THERMOSTAT IS WORKING CORRECTLY! MINE DOES IT TOO. THIS MORNING MY WIFE WAS HAVE THE SAME ISSUE. SHE WANTED THE FURNACE ON BUT THE AC CAME ON AS WELL. HIT THE ON BUTTON, GO TO MODE, PUSH MODE UNTIL AC IS ON AND HIT FAN TO AUTO..FAN MUST BE AUTO, MODE TO AC, THE TEMP WHERE U WANT IT..
 
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Old 04-08-2019, 08:38 AM   #22
oeeman
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I’ve had the situation you describe happen. Was able to resolve by changing the programming. Had to read the directions couple of times - don’t like them. If it is programmed incorrectly program 1 and 2 can overlap. I had to read the direction to program correctly. I also fixed it by putting thermostat in manual mode, but again had to read again, it isn’t obvious how to get out of program mode.
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Old 04-08-2019, 03:28 PM   #23
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Thank you to everyone who responded... I will definitely try out the suggestions and see if the problem goes away.
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Old 04-09-2019, 06:42 AM   #24
Bigbird1957
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We have the opposite problem .we turn on our furnace in our 3791rd and air comes out of the ceiling vents in the livingroom. So we trip the actual breaker
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Old 04-09-2019, 07:49 AM   #25
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just reset the CCC2.
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Old 04-09-2019, 03:11 PM   #26
Carl n Susan
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Quote:
Originally Posted by Bigbird1957 View Post
We have the opposite problem .we turn on our furnace in our 3791rd and air comes out of the ceiling vents in the livingroom. So we trip the actual breaker
The "feature" where the A/C fan runs with the furnace is well documented and even mentioned earlier. Set the furnace fan to Auto and the "feature" goes away.

What doesn't make sense is how the furnace (a 12V DC system) and the A/C fan (120V AC system) cause the breaker (120V AC) to trip.
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Old 04-09-2019, 03:58 PM   #27
Bigbird1957
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It doesn't trip the breaker we trip the AC breaker to all so it doesn't blow I didn't know about the programming
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Old 04-09-2019, 05:05 PM   #28
Carl n Susan
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I misunderstood what you had wrote. You turn off the breaker that supplies the A/C to stop the fan - correct?? Change the fan setting on the thermostat and then there is no need to turn off the breaker.
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Old 04-09-2019, 09:15 PM   #29
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That same thing happened to me, the Mother-in-law was pressing too many buttons and causes this to happen. My son-in-law Googled the solution, the fix was a matter of pressing 2 buttons at the same time and it resolved the problem- Google it
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Old 08-18-2022, 05:09 AM   #30
HondoSwatdog
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How did you know the furnace was kicking on? Was warm air blowing from the stairs? New to this so not sure why I can't get the 5th wheel cool.
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Old 08-18-2022, 06:40 AM   #31
Rsmarlow82
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Could hear the blower motor start up. The Dometic thermostat was a real gem. Lol.
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