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Old 10-03-2013, 08:28 AM   #1
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Furnace won't run in Rockwood 8280WS

Hello, We are camping in East Tennessee and it's a little cool in the mornings. I turned the furnace on to make it a little cozier and nothing happens. I can hear a click at the furnace when I turn the thermostat up but the fan does not come on and hence the furnace will not light. I have pulled the cover and looked at the wiring diagram and see that a sail switch controls power to the gas valve so if the fan doesn't come on the furnace will not fire up. Any ideas or suggestions would be appreciated. Oh by the way, if you wait a minute or two after you hear the initial click, you hear another click. It's seems like there may be something resetting after the initial failure of the fan to start.
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Old 10-03-2013, 08:53 AM   #2
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Furnace

It may sound stupid, but you have the gas on and the bottles have gas?
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Old 10-03-2013, 09:17 AM   #3
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Did you check fuses? The click you hear may be powered by the thermostat on its on fuse.
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Old 10-03-2013, 09:47 AM   #4
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Hello, We are camping in East Tennessee and it's a little cool in the mornings. I turned the furnace on to make it a little cozier and nothing happens. I can hear a click at the furnace when I turn the thermostat up but the fan does not come on and hence the furnace will not light. I have pulled the cover and looked at the wiring diagram and see that a sail switch controls power to the gas valve so if the fan doesn't come on the furnace will not fire up. Any ideas or suggestions would be appreciated. Oh by the way, if you wait a minute or two after you hear the initial click, you hear another click. It's seems like there may be something resetting after the initial failure of the fan to start.
You are correct; if the fan does not come on, the gas will not flow.

There is power to the furnace through the thermostat because the click you are hearing is the heater control panel resetting to try a second ignition. It will do this 3 times before locking out completely and only recycling the thermostat HEAT OFF; then ON, will get another attempt.

While there is a remote possibility it is loose/corroded wire connection at the motor, gas valve, or the control board, your problem is most likely in the fan motor. It is a common shaft fan motor that provides combustion air to the burner and plenum pressure to close the sail switch and heat the camper.

It can fail for several reasons. The most common are a mud wasp nest on or in the combustion air side of the fan motor that prevents or slows rotation; Rusted/Corroded armature; or thermal switch (internal to motor) open.

You can try blowing compressed air into the exhaust port to dislodge debris/nest; but you most likely will need to disassemble the heater to access the motor.
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Old 10-03-2013, 12:09 PM   #5
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As you describe your issue, it could be that the brushes on the commutator ring is not making contact properly due to different factors. You can try this if you feel comfortable with it: make sure you disconnect negative at battery and not on shore power (you don't want any power at furnace), remove front cover of furnace and with a small piece of wood reach in and rotate fan several times. Reconnect negative a battery and raise your thermostat for heat. Hopefully it will start. The clicking you hear is the relay picking up to start fan. Also this relay is a time delay on shut down, meaning it will run the fan for several minutes once heat is reached in trailer. I had similar problem in my unit.
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Old 10-03-2013, 12:15 PM   #6
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On our Flagstaff 8528RKWS, to get access to the blower, I had to completely remove the furnace as the blower is in the rear of the unit and the top could not be removed with it in the compartment it's installed in. I didn't have any problem with the blower motor, I just added a separate blower switch to power the blower without energizing the burner. BTW, it works great.
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Old 10-03-2013, 03:57 PM   #7
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Thanks to everyone for the replies. We moved today and just got setup at Panther Creek State Park NE of Knoxville. This is a beautiful park. It sounds like I need to figure out the cause of the fan motor not starting. I will first try to spin the blower by following fonzie's advice. If the motor spins freely then it looks like the furnace will have to be pulled to trouble shoot further. It looks like there are either two or four screws through the bottom of the furnace holding it in place so I think I just need to remove those screws and the exhaust plate on the outside of the trailer to pull it out. Of course, I will need to remove the gas supply line after turning off the gas and purging the gas line. If anyone has any tips on removing the furnace it would be appreciated. I spend 10 years working in HVAC so I'm comfortable trouble shooting the furnace -- just not sure about removing it.
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Old 10-03-2013, 03:59 PM   #8
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Did you check the fuse already?
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Old 10-03-2013, 04:07 PM   #9
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Did you check the fuse already?
Yes, I have checked all the fuses and both gas bottles are full and turned on. Thanks.
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Old 10-04-2013, 07:31 AM   #10
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Yes, I have checked all the fuses and both gas bottles are full and turned on. Thanks.
This thread should help

Wildcat fifth wheel rv heater removal - FAQ Copy
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