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Topic: Furnace and Duo-Therm (Read 455 times) previous topic - next topic

Furnace and Duo-Therm

Now my next problem, first outing of season can be rough.

Earlier this month when we had some real cold weather (for Texas) I left the furnace on at 45° and didnt have any frozen pipes but it did run out of propane.

I fill up with propane on my way out yesterday and it started getting cool last night so I tired to turn the furnace on but the thermostat no longer shows the furnace just fan, cool, and heat strips.  I have run the reset procedure probably 15 times, I have gone out and cycled the switch on the blower several times.  I have cycled all the breakers again but then I got to thinking the furnace and blower are on the 12v system?

Is there a fuse someplace that I have not seen yet?

Thanks
Steve

1997 U270 36' build 5179
Motorcade #18147
1980 CJ5

Re: Furnace and Duo-Therm

Reply #1 –
Are all the other propane appliances working?
Jennifer
2003 36' U295 (# 6070)
Thousand Oaks, CA

Re: Furnace and Duo-Therm

Reply #3 –
Not sure about that brand, but it sounds like the igniter board has had it. Give these guys a shout, they know their stuff and are nice to work with. I carry spares for all mine.  Dinosaur Electronics Home. High quality circuit boards for RV appliances. 
1993 U-240 "La Villa Grande"..CAT 3116 w/ Pacbrake PRXB...Allison 3060 6-speed..
Previous: 1983 Airstream 310 turbo diesel, 1979 Airstream 280 turbo diesel
                                      Build # 4297
                                      PNW natives
                      Home base:  'Cactus Hug' (Ajo, Arizona)
                        DW Judy & Chet the wonder dog
                        Full-Timers 'Sailing the asphalt sea'

Re: Furnace and Duo-Therm

Reply #4 –
Have you plugged and unplugged all the phone type connectors a few times, possibly with some contact cleaner sprayed on the connections?    We haven't had propane heat in a long time but that procedure  has helped our thermostat find lost devices in the past.

Seems suspicious that it occurred after running out of propane.    Does your salesman's switch kill all the power to that?  I can't remember.  We have had killing the power help in a reset. 
Rick & Rhonda
2003 U320 4220  Build #6199
Was
91 36' GV 300 Caterpillar, 92 40' U280 300 Cummins, 97 36' U295 300 Cummins, 2002
U320 450 Cummins
(Guess we're hooked)

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Re: Furnace and Duo-Therm

Reply #5 –
All coaches are different, but here's the power for our furnace (the yellow wire on the middle right). Has a 20 amp fuse, which started doing strange things, might check the fuse connection. I'd still 'bet the board'.
1993 U-240 "La Villa Grande"..CAT 3116 w/ Pacbrake PRXB...Allison 3060 6-speed..
Previous: 1983 Airstream 310 turbo diesel, 1979 Airstream 280 turbo diesel
                                      Build # 4297
                                      PNW natives
                      Home base:  'Cactus Hug' (Ajo, Arizona)
                        DW Judy & Chet the wonder dog
                        Full-Timers 'Sailing the asphalt sea'

Re: Furnace and Duo-Therm

Reply #6 –
My thermostat had the same problem only it didn't show Zone 2, but turning it OFF and back ON would bring up the readout.  I cleaned all the contacts first like Rick suggested and later replaced all the RJ12 plugs and connectors, the thermostat (a loaner) and finally the board.  The board did the trick!

Good luck with yours Chris.

Re: Furnace and Duo-Therm

Reply #7 –
Quote from: mike leary –
All coaches are different, but here's the power for our furnace (the yellow wire on the middle right). Has a 20 amp fuse, which started doing strange things, might check the fuse connection. I'd still 'bet the board'.

No, Mike, the location of your furnace fuse is UNIQUE.  Much lower voltage drop than the OE wiring that went through smaller gauge wire from house battery by back right tire then through the 12 VDC fuse panel by the foot of the bed then to the furnace.

Curious-- what strange things is a fuse doing? Please PM so we don't take the tread off course.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Furnace and Duo-Therm

Reply #8 –
Quote from: mike leary –
Not sure about that brand, but it sounds like the igniter board has had it. Give these guys a shout, they know their stuff and are nice to work with. I carry spares for all mine.  Dinosaur Electronics Home. High quality circuit boards for RV appliances. 
Thanks, I will give them a shout
Steve

1997 U270 36' build 5179
Motorcade #18147
1980 CJ5

Re: Furnace and Duo-Therm

Reply #9 –
Thanks RIck  I just tried the plug in the thermostat 5 times and no luck.  there is not one I can find on the furnace board.
Steve

1997 U270 36' build 5179
Motorcade #18147
1980 CJ5
 

Re: Furnace and Duo-Therm

Reply #10 –
Thanks Tman
Steve

1997 U270 36' build 5179
Motorcade #18147
1980 CJ5