dometic a/c

roy2

Active Member
im just wondering our a/c when it is running on auto sometimes the high fan will come on for a while and then it goes back to auto.is that normal? its been doing it this past summer. thanks.
 

jmarnell

Well-known member
When set on Auto, our a/c fan will vary between high and low speed depending on how hot it is and how hard it needs to work to cool things down. Perfectly normal operation.
 

Hollandt

Member
im just wondering our a/c when it is running on auto sometimes the high fan will come on for a while and then it goes back to auto.is that normal? its been doing it this past summer. thanks.
The auto position actually allow the fan speed to switch between low and high speed. It does this based on the difference in degrees from the actual temp to the setpoint temp. I don't remember the exact number but I think it runs on low up to a 3 or 4 degree difference and switches to high at 4 to 5 degrees and above difference and of course stops with the temp is satisfied. The fan on mine will actually stop for a few seconds during the switch over between high and low speeds.
 

roy2

Active Member
The auto position actually allow the fan speed to switch between low and high speed. It does this based on the difference in degrees from the actual temp to the setpoint temp. I don't remember the exact number but I think it runs on low up to a 3 or 4 degree difference and switches to high at 4 to 5 degrees and above difference and of course stops with the temp is satisfied. The fan on mine will actually stop for a few seconds during the switch over between high and low speeds.
thanks mine does that to stops for a sec and comes on again
 

marknewbill

Well-known member
mine is useless in auto, it goes high low high low, repeatedly seconds apart when the temp gets just right for it to happen. i have to manually set high or low, mine is the dometic thermostat in a 2020 model. they said it was normal at dometic. looks like a bad design to me. I would happily buy another thermostat if this feature could work correctly, but they didnt inspire any confidence in that since they said it was normal and just recommended the manual settings. in my opinion there should have been a delay in the programming such at any time it had to wait about 5 minutes to change speeds after any recent change. something like that would make it run well. also- there is no vent in the area blowing on it or anything like that. i even put something over it one time to see if that helped. it didnt. its just bad programming code in my opinion.
 
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