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Old 01-09-2014, 10:19 PM   #11
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Damn I seem to cause disagreement everywhere I go on here! lol If its not gas vs diesel it blower vs control board.
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Old 01-09-2014, 10:32 PM   #12
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Sounds like the thermostat is closing the relay that has the bi-metal disk that closes and starts the fan. Had a similar thing happen with our furnace, but it was the connection(electrical) that plugs into the furnace, not making good contact.
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Old 01-09-2014, 10:40 PM   #13
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Quote:
Originally Posted by garbonz View Post
Please let us know what you find out, so we all can learn.
Removing door inside RV right now to inspect unit for loose wires, soot, misaligned control board, etc. to try to pinpoint obvious causes. Coach-Net phone service technician mentioned underpowered unit in the differential diagnosis. I'll check or have RV service tech to check my amp draws to see if I've lost some power to the unit somehow. Can't imagine how that would have happened as the RV hasn't moved for 2 1/2 months. Maybe I've had a wire to fray and lose good contact. An underpowered unit could sure create a click but not have enough power to engage. Hopefully manufacturer didn't cut corners and put low grade wiring to unit. I checked thermostat and has good contact; symptoms suggests its beyond thermostat anyway.
Guess I need to review the information on the unit more to see exactly what the sequence is for the entire unit to engage and try to pinpoint exactly where it is faulting.
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Old 01-09-2014, 10:47 PM   #14
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Originally Posted by JohnandPandra View Post
Sounds like the thermostat is closing the relay that has the bi-metal disk that closes and starts the fan. Had a similar thing happen with our furnace, but it was the connection(electrical) that plugs into the furnace, not making good contact.
Certainly a possibility. Right now I'm leaning more towards an electrical component versus a mechanical cause. The unit just isn't old enough IMO to have enough wear & tear for it to be mechanical. The RV has only been towed about 200 miles since purchase....sitting ever since and heater has only been used about 1 month. Bad units do happen though...
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Old 01-09-2014, 10:53 PM   #15
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Underpower? You might want to check your battery voltage. Are your lights working okay and the other 12volt systems? looking for loose connections is a good first start.
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Old 01-09-2014, 10:55 PM   #16
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Frustrating for sure. We had used our trailer probably 3 or 4 times before our furnace problem showed up. Worked great until that. Wouldn't fire and did the same thing. Got to where there wasn't any sound. That is where our problem was. Might have been road vibration loosening that connector. They don't provide a very good access door to look at furnaces in RV's.
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Old 01-09-2014, 10:56 PM   #17
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What brand is the thermostat?


http://www.google.com/url?sa=t&rct=j...59026428,d.cGU

https://www.google.com/search?q=repl....com&x=24&y=12


http://www.google.com/url?sa=t&rct=j...59026428,d.cGU

I would swap the thermostat out, easy to do and the cheapest.
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Old 01-10-2014, 12:20 AM   #18
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Quote:
Originally Posted by garbonz View Post
Underpower? You might want to check your battery voltage. Are your lights working okay and the other 12volt systems? looking for loose connections is a good first start.
Everything else powers up ok. Haven't had any issues except when I attempted to use 2 space heaters simultaneously...breaker tripped immediately. I might put a surge meter/protector on the RV park power hose just for protection against spikes/undercurrent. Oh the learning curve...

Got the cover off to expose the furnace...its gonna be a real bitch to get to! Totally surrounded by particle board/carpet next to and under bed. Hope the technician is a good carpenter! The gas/electric/thermostat connections are on the far side, the most difficult area to get to. Room Air Wheel part of blower was where I could inspect it. Looks clean and spins freely without any wobble/noise. Attempted to start furnace after turning wheel and shaft...no such luck.




From Suburban Furnaces Manual the sequence is this:

I. The wall thermostat controls the operation of the furnace by reacting to room
temperature, this allows current to flow through the On/Off switch to the module board.
The thermostat controls the operating circuit to the furnace by reacting to room temperature to open and close a set of contact points which allows current to flow to the ON and OFF switch then to the relay.
The relay receives the power and allows power to pass through to the switch within the relay. This is done by a
heater coil within the relay which actuates a bi-metal disc closing the relay circuit.
IF OK, THEN...

II. The module board constantly checks for a minimum 9.5 volts. If there is not 9.5 volts,
the module board will go into a stand by mode until adequate power is supplied. It will
then resume normal operation.

IF OK, THEN...

III. Upon a call from the thermostat, the module board thermostat circuit will go active. The
sail switch circuit is verified as being open. The blower output is energized. Blower
motor starts.

STOP THERE...Blower never engages so the problems MUST be one of the 3 above or the blower itself which I doubt.

Remote possibility would be a failed sail switch but is unlikely.

I'm hoping its just a module board that just has come loose and isn't making good contact. I shall find out tomorrow I guess. I did have a bag storm here a couple of weeks ago that could have possibly rattled the board a bit...60 mph gusts. It was a long night!
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Old 01-10-2014, 12:35 AM   #19
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It is a Coleman-Mack. Of course it would be the one the local RV dealership doesn't have in stock. From reading other threads I understand the stats put in these RV's are not of the best quality. If my issue turns out to be a thermostat issue I probably will replace with a better digital stat.
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Old 01-10-2014, 06:35 PM   #20
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Ding Ding.
Garbonz you get the prize. Bad relay on module. Warranty covered the $260 price of part + labor. Took about 1 1/2 hrs to replace. Getting good heat now. Got a little nervous when I got RV back to park as the furnace ran for 3 minutes and shut off. I was thinking "crap here we go again" then I remembered the temp outside was in the mid-60's so of course it shut off.
Happy camper now...mostly. Was setting up RV and leveling. NOW the side-to-side leveling jacks aren't working! Oh well, off to do more research on what has gone wrong. Service guy is supposed to call me tomorrow to let me know if he might have loosened a wire to get to furnace.
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