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Old 02-25-2015, 12:32 PM   #1
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Furnace won't light

Beautiful spring evening in Texas, and then awake to 27 degrees. Turned thermostat to heat mode and set on 75 degrees with no heat. All I can hear is a clicking sound with no blower coming on. All the fuses were good, thermostat had power, and the air worked. Any help or advise would be greatly appreciated. Thanks
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Old 02-25-2015, 12:54 PM   #2
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Inside your furnace you will find something that looks like this (yours may vary)

Do you see it sparking making a clicking sound? If so then something is not allowing LP to flow.

No LP?
Valve open on tank?

If you have fuel and the valve is open then the electronics that allow the gas to flow are the problem.
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Old 02-25-2015, 01:01 PM   #3
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check the thermocoupler
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Old 02-26-2015, 04:56 PM   #4
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Quote:
Originally Posted by Rfrench73 View Post
Beautiful spring evening in Texas, and then awake to 27 degrees. Turned thermostat to heat mode and set on 75 degrees with no heat. All I can hear is a clicking sound with no blower coming on. All the fuses were good, thermostat had power, and the air worked. Any help or advise would be greatly appreciated. Thanks
I had a similar experience a couple of weeks ago. Came home to a cold trailer. Blower would blow but burner wouldn't light.

Turns out that the fan blades on the blower had accumulated dirt and dust on them which reduced air volume through the furnace. This prevented the Flow Switch from making contact and allowing gas to flow.

You may just need to open up the furnace and clean out the blower blades. Fairly simple, if you can get to the furnace easily. I had to have a tech come out and pull out the furnace, take it to the shop and clean it out. Works great now.

I found that my little 25 ft TT does not have a furnace filter in the intake. So I bought some "Filtreet" filter material, cut to size and fitted it behind the intake louvers. Now I can just open up the louvers, pull the filter, wash and re-install to keep the blower blades clean. $5 and change compared to a $280 service call.
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Old 02-26-2015, 05:09 PM   #5
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Quote:
Originally Posted by Rfrench73 View Post
Beautiful spring evening in Texas, and then awake to 27 degrees. Turned thermostat to heat mode and set on 75 degrees with no heat. All I can hear is a clicking sound with no blower coming on. All the fuses were good, thermostat had power, and the air worked. Any help or advise would be greatly appreciated. Thanks
Rfrench73
The blower MUST run before the furnace will fire.
See: Troubleshooting RV Furnace Problems, and/or do a search for a "trouble shooting guide" for your make/model furnace.
Mel
'96 Safari, (Suberban SF-42 F propane furnace)
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Old 02-27-2015, 06:13 AM   #6
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When the T-Stat calls for heat the control board starts the blower (1)
The blower blows closing the sail switch (2)
The control board then opens the gas valve (3) and begins sparking (4.1)
Gas Flows (5) And ignitets (4.2)
The flame heats the flame sensor (5)
The flame sensor sends .480 volts to the control board (6)
which then detects the .480 and continues operation (*)
When the T-stat says "Enough already" (RV is now warm)
The control board shuts off the gas flow (*)
and then turns off the blower after a cool down (*)

*: At nearly every step the control board is involved. IF IT IS BAD, things will not work.. I recommend replacement boards from Dinosaur boards.. When Mine went out the Dino board was less than half the price and when opened the box the quality of construction and workmanship, and then design was very clear to my trained eyes.

1: No 12 volt to furnace, blower motor shot
2: Low 12 volt, air ducts clogged, blower "obstructed" bad sail switch
3: Bad solenoid, Clogged Gas Jet
4: .1: Bad ignition circuit (high voltage) on control board. .2: Points too wide (Very common it seems)
5: These do not often fail but they can
5: Bad connection, NOTE:
5 and * Bad wire.

* applies to all steps by the way So does bad wire/connection.
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