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Old 09-24-2003, 11:23 AM   #1
4 Rivet Member
1990 32' Excella
jonesboro , Arkansas
Join Date: Aug 2002
Posts: 250
AC problems

Coleman 6759 mach 3 with heat. Heat only works with switch turned to low or high cool and then turning the t-stat to warm.
The element will not come on in the appropriate low heat setting. this unt is original to the trailor and otherwise works great.

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Old 11-10-2003, 06:45 PM   #2
Well Preserved

1993 21' Sovereign
Colfax , North Carolina
Join Date: Jun 2003
Posts: 20,364
Sounds like the PC board that controls the climate control is messed up, they seem to be famous (or infamous) for that. Maybe Andy from Inland RV could tell you how to check it, if you asked him real nice...

Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
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Old 11-11-2003, 09:14 AM   #3
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Airstream Dealer
Inland RV Center, In's Avatar
Corona , California
Join Date: Feb 2002
Posts: 16,499
Images: 1

Several things to check.

Bad selector switch.

Relay terminals stuck.

Crimped wires shorting together.

Something shorting terminals on the selector switch.

Easy fix?? Disconnect the heating element.

No heat, but fixes the problem.

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