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Old 12-09-2017, 01:37 PM   #1
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Furnace issues

Furnace will turn on in 2008 Rockwood, but after a few minutes it will only blow cool air or shuts off. Replaced the switch, and its still doing the same thing.
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Old 12-09-2017, 02:01 PM   #2
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Is propane turned on? Also, low battery voltage will not allow the furnace to light.
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Old 12-09-2017, 02:10 PM   #3
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Yes propane is on. New battery and new converter. Have purged the system also.
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Old 12-10-2017, 07:29 AM   #4
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I am not sure but just chiming in to help. On most flame heat source furnaces or heaters they have a thermocoupler attached near the flame to sense that a flame is present so it's not just dumping propane without burning it. If that is broken or damaged or covered in a oxidation .... The propane will be shut off if it doesn't 'sense' a flame, even if a flame is present.
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Old 12-10-2017, 09:11 AM   #5
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Agree it may be your thermocoupler some tines called a Flame Sensor, just do a search on Youtube how to check.

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Originally Posted by ChibullsAN View Post
I am not sure but just chiming in to help. On most flame heat source furnaces or heaters they have a thermocoupler attached near the flame to sense that a flame is present so it's not just dumping propane without burning it. If that is broken or damaged or covered in a oxidation .... The propane will be shut off if it doesn't 'sense' a flame, even if a flame is present.
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Old 12-10-2017, 06:07 PM   #6
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On my previous travel trailer I had the same problem. A small insect had died in the propane orfice. we were on the road and called a mobile repair service. He stated this was very common.

the way he diagnosed was he cupped his hand over the exhaust restricting the small amount of unburned propane that was flowing and it ignited.

After that I put insect screen on but not sure how much that really helps.

The opening in the insect screen is much larger than the orfice size.
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Old 12-10-2017, 11:11 PM   #7
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I would check for bugs, spiders, cob webs, dust, dirt or soot. That is a common problem. use an air compressor or a leaf blower to clean the tube. Beware any foreign material will blow out the exhaust end of the tube.
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Old 12-11-2017, 08:43 AM   #8
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Quote:
Originally Posted by JOBE1 View Post
Furnace will turn on in 2008 Rockwood, but after a few minutes it will only blow cool air or shuts off. Replaced the switch, and its still doing the same thing.


Try shutting the furnace off at the thermostat and shut the battery off at at the battery disconnect shut off the shore power and wait 15 minutes. That should reset the furnace controls.
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Old 12-11-2017, 09:05 AM   #9
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Being that the OP has a 2008, I doubt it has the digital thermostat. Analog thermostats don't have a reset function.
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Old 12-11-2017, 09:44 AM   #10
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#1...does it light ? (Spark igniter) (Blocked gas orifice)
#2...If it lights...does it only burn for a few seconds ? (Flame Sensor) Dirty or broken. carbon build up will diminish sensitivity of sensor.
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