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Originally Posted by wacnstac Well I thought I was going to have this problem licked. I had the furnace on my bench and found that the limit switch which is normally closed was open. I ordered a new limit switch, fan switch, and sail switch, for good measure.
Replaced them all, cleaned things up a bit and hooked up to gas (with a brand new regulator) and hooked it up to power. Then I fired it up by putting 12V on the thermostat connector pin. The fan turns on, the sail switch engages, and about 10-15 seconds later, the gas solenoid pops open (audible click) and I get a good spark from the ignitor for a good 5 seconds. Problem is I get no flame. Don't know what else could be bad. Is there some sort of gas venturi somewhere that could be plugged? I can smell unburnt gas coming out of the exhaust port so I know it's getting some gas but I don't know how much it needs to get.
Any furnace doctors out there? I really don't think it's the board that is bad but I could be wrong. Will any service centers still service these old gals or do they stay away from them with a 10' pole? |
Checking the orifice is a good idea.....just use carb cleaner of compressed air to blow it out. Don't put ANYTHING thru the orifice that is harder than that.
You also might have a poorly adjusted regulator, even though it's new. If you have a manometer, connect it to the test port on the regulator and start an LP appliance (that is working). You should read 11 inches of water guage, or about 1/2 PSI. If you're not getting this, the regulator is out of adjustment.
I would think that the orifice is the problem though
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