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Old 11-22-2010, 10:03 PM   #1
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1963 22' Safari
sherman oaks , California
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Pilot Light works but not heater

pilot lights upo well but when I turn the thermostat up, burner does not kick on and the pilot goes somewhere else?#$#@@%$% When I turn off the thermostat the pilot comes back on.
62 Safari 12v and gas only.
Any thoughts?
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Old 11-23-2010, 06:04 AM   #2
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Some articles that may help - others are out there with a Google search...

Suburban RV Furnace Service Information | eHow.com

An RV Furnace Won't Light | eHow.com

RV Furnace Trouble Shooting - RV Furnace Trouble Shooting Page
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Old 11-23-2010, 07:27 AM   #3
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1968 24' Tradewind
Oxford, , Mississippi
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Be very careful with old furnaces! I have my old NT-22 working, at least I thought I did. I could make it run on the bench by moving the sail switch. I took the unit to a buddy in the HVAC business to see if he could find a switch that would work. When he checked the unit he found a hole inside the heat exchanger. That could have been deadly, as exhaust fumes would have mixed with the heated air. Make sure you know what you have before you trust your life to an old furnace.
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Old 11-23-2010, 08:09 AM   #4
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First thought would be the thermocouple. The thermocouple is heated by the pilot and sends a signal to the gas valve that there is proof of pilot. Without this signal the gas valve will not pass gas.

I would make sure the thermocouple is in fact in the pilot flame and if so and the heater does not come on after the pilot has been on for at least 30 seconds replace the thermocouple.
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Old 11-23-2010, 12:09 PM   #5
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1963 22' Safari
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thanks to all...I'll start to check these possibilities out over the holiday wknd. I have to admit...letting the thermocoupler heat up a while might b the first thing I try
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Old 11-23-2010, 01:18 PM   #6
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1963 22' Safari
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sorry, just thought about this thermocoupler...does the pilot light it when the termostat is off? or once the pilot is lit, do I turn the thermostat on and up and that heats it after a while because I have done that and as I mentioned ...no heat up
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Old 11-23-2010, 03:33 PM   #7
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If the pilot light lights the control board is working. Once the pilot light is lit and has heated the thermocouple for about 15 or so seconds you should hear a CLICK as the gas valve opens. If you do not hear that click the thermocouple has not told the gas valve that there is a pilot lit.

This failure to show proof of flame may also shut off the pilot light gas an be why you are seeing the pilot light go out.

Replace the thermocouple as a first shot. When you put the thermocouple into the gas valve work the end of the thermocouple back and forth a bit before tightening it in place to make sure you have a clean connection. The connection is important since this is a very low voltage signal passing into the gas valve.
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Old 11-28-2010, 10:56 PM   #8
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1963 22' Safari
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I want to thank you all. Just took a little time to heat up that thermocouple with the pilot before I turned the thermostat on.

Toasty now!

Couldnt have done it without you!

Thanks
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