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Old 08-27-2014, 01:55 PM   #1
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Heater fan problems

The last couple of times I have been RV ing, when I turn off the air conditioner the heater fan starts running. A couple times I have just run the air conditioner fan and when I turn the AC fan off that heater fan runs. Both times I was hooked into 110v. I assumed that the heater fan was 12 VDC ?
Anyone else ever have this happen?
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Old 08-27-2014, 07:44 PM   #2
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You didn't say if the fan stops on its own after a period of time. But I've had a similar issue in a toy hauler T/T. Its the thermostat setting and was normal in my case. The fan would cycle and then shut off.

Is this what you have going on????

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Old 08-28-2014, 05:37 AM   #3
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Yes it stops after time. It is a Intellitec climate control and I thought I had read on the forum that people had problems with that brand prev.
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Old 08-28-2014, 07:57 AM   #4
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Under my frig. is the climate control module and at times I here a clicking noise like a relay.
Anyone know of a place to buy a new module ?
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Old 08-28-2014, 12:44 PM   #5
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Just ordered a new ECC control module off eBay hopefully that will help
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Old 09-03-2014, 08:45 AM   #6
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Received my new control unit today hook it up very easy to hook up,
However it did not solve my problems
When I turn off the air conditioners off for some reason the heater fan keeps coming on.. After about 5 minutes the heater fan shuts off
Any ideas would be greatly appreciated.
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Old 09-03-2014, 07:56 PM   #7
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If controlled by a wall thermostat, you may be going past the off position when turning the AC off and hitting the furnace on position then back to off. this has happened to me on different occasions. As soon as the switch hits the furnace position the furnace fan comes on and will run for a few minutes. Once you hit the furnace on position the fan comes on and will not shut off until it runs for a set time. Hope this helps.
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Old 09-04-2014, 05:56 AM   #8
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Add a ground wire for the furnace and that should fix the problem.
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Old 09-04-2014, 07:37 AM   #9
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Quote:
Originally Posted by RV Wizard View Post
Add a ground wire for the furnace and that should fix the problem.
A ground wire, why now after 13 years would it need a ground ? It should already be grounded.
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Old 09-05-2014, 04:58 AM   #10
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Quote:
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A ground wire, why now after 13 years would it need a ground ? It should already be grounded.
Exactly, but I found this scenario in a coach; called Dometic about it and I was instructed to add a ground (original lost good continuity) and sure enough, it fixed the problem.
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Old 09-06-2014, 12:42 PM   #11
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Tried the ground wire no luck.
Replaced the thermostat on the wall today and all works good now.
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Old 09-07-2014, 06:35 AM   #12
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Glad you have the problem corrected. I must apologize. I went back and reread some of your original post to see that I misread ECC to be CCC; big difference.
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