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Open Roads Forum  >  Tech Issues

 > SF 42 furnace madness

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dougrainer

Carrolton, Texas

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Posted: 02/24/20 12:23pm Link  |  Quote  |  Print  |  Notify Moderator

You are missing where the wires we are talking about are located. There is NO switch at all. You should have a RED/YELLOW and those 2 blue wires that exit the furnace case and go to the interior of the RV. Switch the 2 blue wires where they are next to that Red/Yellow. Doug

Lt46

Central Florida

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Posted: 02/24/20 02:50pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks Doug. The furnace harness has the red, yellow, and 2 blue wires which terminate into a molded plug that connects to Winnebago's house wiring. The 2 blue wires I followed from there and they terminate into the mini on/off switch near the circuit board. I see no other blue wires. BTW, I never altered any Winnie wires nor the furnace wires. Molded connectors at each ends of the Winnie wires.


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Lt46

Central Florida

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Posted: 02/24/20 06:05pm Link  |  Quote  |  Print  |  Notify Moderator

Doug, I remember reading a post of yours to another camper with a similiar problem (2010). You asked him if he had a Dometic AC and if so there would be a relay up there worth looking at. Does that also apply to Coleman 7333C886 units?

mchero

Henniker, NH

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Posted: 02/24/20 06:15pm Link  |  Quote  |  Print  |  Notify Moderator

Do you have a test light or volt meter?


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dougrainer

Carrolton, Texas

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Posted: 02/25/20 05:32am Link  |  Quote  |  Print  |  Notify Moderator

Lt46 wrote:

Thanks Doug. The furnace harness has the red, yellow, and 2 blue wires which terminate into a molded plug that connects to Winnebago's house wiring. The 2 blue wires I followed from there and they terminate into the mini on/off switch near the circuit board. I see no other blue wires. BTW, I never altered any Winnie wires nor the furnace wires. Molded connectors at each ends of the Winnie wires.


Is it possible you swapped the blue wires inside the furnace when you did all the work? The MAIN thing, you should have 12 volts positive on 1 of the blue wires exiting the furnace. Report back on this. Yes, most RVP and Dometic systems have a relay, but you state the wall tstat is dead. Which means you have no power to the tstat or upper control board. Doug

Lt46

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Posted: 02/25/20 06:10am Link  |  Quote  |  Print  |  Notify Moderator

mchero, yes, I have both.

Doug I will probe the furnace harness and check for power on the blue wires. I have already confirmed that I have 12v+ @ the furnace but never checked for 12v+ on the blue wire. Yes, you are correct I have no power from t-stat to rooftop coleman. Probing the Y, GH, GL and Ground on the AC unit shows nothing. FAN alone does not work either. I'll get to that later this morning and post my results. Thanks

Lt46

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Posted: 02/25/20 10:03am Link  |  Quote  |  Print  |  Notify Moderator

Doug, Thankyou, thankyou, thankyou for insisting I chase the 12v on the blue wire. I pulled the furnace once again and chased the blue wire. Low and behold I find a butt connector tucked in and under the circuit board. Of course it had separated and once redone SUCCESS!!!! Thanks again for your guidance. All systems are running perfectly.

mchero

Henniker, NH

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Posted: 02/25/20 10:25am Link  |  Quote  |  Print  |  Notify Moderator

Good News! Great that we have Doug on this site!

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