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Old 04-24-2011, 12:05 PM   #1
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Air Conditioner acting up

I have a 2007 40' Coachman Pathfinder, the front Air conditioner (Dometic) will start to work intermittently even when the Thermostat is in the Off position when you are connected to 110 power, the only way to stop it is turning the 110 power brake off, and when you are driving intermittent clicking noises (like solenoids) come from an electronic box located inside the Air Conditioner. The rear Air conditioner works great, only when activated by his own thermostat.

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Old 04-24-2011, 02:01 PM   #2
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I can think of three possibe issues and how to isolat them

Number one with a staple gun is a wiring issue.. Some idiot stapled the wire THROUGH the wire (Why it's #1 with a staple gun) and the staple finally cut through two of the wires. Yes, those two, the two the T-Stat connects together to signal "Hey, it's hot in here, cool me off"

#2, Defective stat

#3 Defective control board in the A/C.

Alas, that is a bit like saying "The problem is between the soul of your shoes and your hat"

But here is how to narrow it down

Carefully label and disconnect and tape off all wires at the T-Stat

Problem goes away, It's the stat.

Problem remains,, Re-connect T-Stat (See note below)

Disconnect at the Air Conditioner end .. Again do not forget to label carefully

Problem goes away, Wire, Problem remains, Control board.

NOTE: Some T-Stats are "Socketed" you can very easily remove the T-Stat from teh backing place, inspect for visible shorts where the wires connect and fix if found,, If this is the case, you do not need to label and disconnect. Just unplug.

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Old 04-25-2011, 09:07 PM   #3
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Air conditioner acting up

Thanks wa8yxm for your help, I will try your suggestions and keep you informed.
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Old 04-26-2011, 09:51 PM   #4
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Air conditioner acting up

Hi wa8yxm, I took every wire from the (New)T-Stat and made no difference. It will keep going on intermittently , I also disconnected the wire from the Control Box to the A/C, then I switch off the 110 breaker. then stop but it keep making noises from the Control Board Box trying to start.
Will the Inverter have anything to do ? Thanks again
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