Janitrol 20-125 Gas Furnace Will Not Fire - HVAC - DIY Chatroom Home Improvement Forum

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Old 11-09-2008, 09:18 AM   #1
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Janitrol 20-125 gas furnace will not fire

I am living in my grandmother's previous home and someone had turned the gas supply off to the furnace, a Janitrol 20-125... old monster. I attempted to run it for the first time this year and it will not fire, I turned the gas supply on and lit the pilot, and the signal from the thermostat can be heard at the gas valve solenoid, but no gas or blower.
I also noticed that the pilot is almost shooting with a slight hiss from the end of the tube....it is rated for 1/2 psi pilot. Is this a regulator/valve issue? Could the diaphragm failed? This is a Honeywell V800A 1476 standing pilot gas valve. There is a manual switch on the blower control, or limiter, and the blower is operational when switched. Also the pilot adjust screw on the valve has no effect. Any help would be great!


Last edited by flatlander745; 11-09-2008 at 11:51 AM. Reason: Add info
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Old 11-09-2008, 06:22 PM   #2
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Location: Sringfield, Oh
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1st, do you have a volt meter? if you do check for 24 volts across the gas valve with the t-stat calling for heat, if you do the gas valve is bad. If you don't have a meter, take the t-stat off and jumper from r - w. If the furnace comes on you have a bad stat. As far a the pilot hissing, that is pretty normal unless it sounds like a propane torch. The pilot adj. screw that you referred to needs to be screwed in to lower the pilot. To troubleshoot you really need at least a volt meter. You can pick one up from Radio Shack for $10-15.


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