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Open Roads Forum  >  Fifth-Wheels

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Bird Freak

Dallas Ga.

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Posted: 01/16/23 09:45am Link  |  Quote  |  Print  |  Notify Moderator

My buddy has a problem with his Dometic a/c unit. This is a older unit. It may run all day and then just shut's off and comes right back on and continues to do this. It acts like the power shuts off and comes right back. I replaced the thermostat because I didn't understand what he was telling me to start with and no change.
Any Idea's what will cause this?

* This post was edited 01/16/23 12:08pm by Bird Freak *


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enblethen

Moses Lake, WA

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Posted: 01/16/23 09:52am Link  |  Quote  |  Print  |  Notify Moderator

Could be issue with the power if it is a low voltage thermostat. Low voltage control should have a transformer and could have an auto resetting circuit breaker.
make and model of original and replacement thermostat.


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Coach-man

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Posted: 01/16/23 10:22am Link  |  Quote  |  Print  |  Notify Moderator

I agree it is a voltage issue! The thermostat operates on DC voltage which operates a relay. The relay turns on/off the A/C unit. Low voltage will let the relay release prematurely and then it try’s to turn back on. It could also be a faulty relay. Looks like you need a qualified A/C technician to check all the components.

pianotuna

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Posted: 01/16/23 12:49pm Link  |  Quote  |  Print  |  Notify Moderator

I am in a unit that does that. I don't think there is any power shedding--but that could be it too.


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Hondavalk

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Posted: 01/17/23 07:35am Link  |  Quote  |  Print  |  Notify Moderator

i know with mine the unit will have a pause like when the blower automatically changes speeds. been doing that for the eleven years ive owned it. the hotter it is the more it cycles





enblethen

Moses Lake, WA

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Posted: 01/17/23 08:10am Link  |  Quote  |  Print  |  Notify Moderator

Get the model number of his Dometic A/C unit.

Bird Freak

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Posted: 01/17/23 08:54am Link  |  Quote  |  Print  |  Notify Moderator

enblethen wrote:

Get the model number of his Dometic A/C unit.
He is 70 miles from me and can't get on the roof and has no paper work.

enblethen

Moses Lake, WA

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Posted: 01/17/23 09:29am Link  |  Quote  |  Print  |  Notify Moderator

What is the approximate age of the unit?
Should also have some information under the interior unit.

* This post was edited 01/17/23 09:42am by enblethen *

Bird Freak

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Posted: 01/17/23 06:49pm Link  |  Quote  |  Print  |  Notify Moderator

enblethen wrote:

What is the approximate age of the unit?
Should also have some information under the interior unit.
2003

enblethen

Moses Lake, WA

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Posted: 01/17/23 07:02pm Link  |  Quote  |  Print  |  Notify Moderator

That helps.
That age probably has a circuit board. could have a loose connecting on circuit board.

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