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A/C Runs Continuously

June 14, 2017, 06:40:06 pm

I have the original Dometics (97 270) and 4 button thermostat. Both A/Cs work well but the rear runs continuously rather than shutting down when it reaches the desired temp. What's up? Thanks.
jor

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Re: A/C Runs Continuously

Reply #1 – June 14, 2017, 06:45:33 pm

Sounds like the thermistor for the rear unit is not working

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Re: A/C Runs Continuously

Reply #2 – June 14, 2017, 07:17:36 pm

Is zone 2 set to auto?

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Re: A/C Runs Continuously

Reply #3 – June 14, 2017, 07:41:22 pm

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Is zone 2 set to auto?

Uhhhh... well, actually... no. Forgot about that. Thanks. Good to go.
jor

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Re: A/C Runs Continuously

Reply #4 – June 15, 2017, 10:31:00 am

I had the contacts go bad and fuse in one of the potted relays on the roof and had to replace it on my 93 years back... Still have one: Potter & Brumfield
T9AS1D22-24
N.O 30A

desolder/resolder.

Circuit breaker only way to shut it off - could have hung meat in the bedroom.

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Re: A/C Runs Continuously

Reply #5 – June 15, 2017, 11:13:34 am

I think the fans can be set to "Auto" "High" or "Low" .  If it is set to high or low the fan will run continuously even if the compressor isn't running. 

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