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Presidential Furnace in an RV will not run properly

Home > Discussion Forum > Mechanic's Corner (general)

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Presidential Furnace in an RV will not run properly Tom 3-28-08  
I have a 1978 motor home with a Coleman Presidential furnace in it and a wall thermostat.. I have replaced the pilot light assembly. The burner tube is in great shape as is the burn chamber. Here is my problem. I turn the valve to ‘pilot’ and the pilot lights and burns perfect on the first strike. However, when I turn the valve to ‘on’, the burner lights up and immediately snuffs out. I thought when I turned the valve to ‘on’ it was supposed to be in the ready state waiting for the thermostat to turn the fan on and then open the gas valve with the electric solenoid valve. (If I turn the fan on manually before I turn the valve to ‘on’ it lights up and burns fine). Can someone explain what might be wrong with the furnace or if I am doing something wrong. I hate to buy a brand new furnace when this one has hardly been used.
Also, if I turn the fan on manually and the furnace is running after about 3 minutes the high temp limit shuts the fuel off until it cools a little and then it burns for another few minutes until the limit switch pops again.

Thank you,

Tom
Re: Presidential Furnace in an RV will not run properly rich 3-28-08  
Hello Tom;
the Thermocouple needs to get hot "above the flame" which produces micro volts which opens the gas valve---tighten the connection--it might just be a bad connection-but the thermocouple might be bad too
rich
Re: Presidential Furnace in an RV will not run properly Tom 3-28-08  
Rich,
I replaced the thermocouple the same time I replaced the pilot light assembly.
Re: Presidential Furnace in an RV will not run properly Julie 4-5-08  
Need to know how to "reset" furnace after home's breaker panel replaced
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