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HVAC Controller Location

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thrutraffic

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HVAC Controller Location
« 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?

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donc13

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Re: HVAC Controller Location
« Reply #1 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
« Last Edit: December 30, 2019, 08:42:29 pm by donc13 »
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Don and Patti

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Syd and Margo

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Re: HVAC Controller Location
« Reply #2 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.

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keelhauler

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Re: HVAC Controller Location
« Reply #3 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.



John

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thrutraffic

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Re: HVAC Controller Location
« Reply #4 on: January 01, 2020, 11:02:09 am »
Thanks folks! The auto setting solve the ac fan ru on furnace start.