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Main Forum => General Discussion => Topic started by: thrutraffic on December 30, 2019, 06:20:46 pm

Title: HVAC Controller Location
Post by: thrutraffic on December 30, 2019, 06:20:46 pm

Having issues with HVAC; 2011 2551.

Couple of problem examples:

- Turn furnace on, it runs brings up temp, turns off, never comes on again by itself, click temp up two (one won’t work) degrees and furnace runs a cycle, rinse/repeat.
- Set thermostat to furnace and when the furnace comes on so does the AC unit. I have to turn the AC breaker off to run the furnace by itself. I have a heat strip unit but the air doesn’t get warm so assuming it’s the AC fan running.

I’ve replaced the thermostat on recommendation of Dometic but that changed nothing.

I understand there is a control unit the thermostat connects to but don’t recall seeing that the few times I’ve had the utilities compartment under the bed open.

Before I rip that all apart again can someone confirm that’s the location of the controller I’m talking about?

Title: Re: HVAC Controller Location
Post by: donc13 on December 30, 2019, 08:40:34 pm

The control unit is in the air conditioner itself.

It's a circuit board that's exposed when you remove the interior cover/air vent

Title: Re: HVAC Controller Location
Post by: Syd and Margo on December 31, 2019, 10:34:39 am

You must have the fan set on auto when using the heat strip for heat. This will stop the fan from running when set on heat.

Title: Re: HVAC Controller Location
Post by: keelhauler on January 01, 2020, 10:00:23 am

You must have the fan set on auto always, or fan will run in A/C when you run furnace.

Title: Re: HVAC Controller Location
Post by: thrutraffic on January 01, 2020, 11:02:09 am

Thanks folks! The auto setting solve the ac fan ru on furnace start.