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Lennox G8D2-82-3 Furnace


John Martens

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Trying to trouble shoot a furnace for a friend before it gets too cold up here in Alberta...

It's a old Lennox G8D2-82-3. The furnace will not turn on no matter how high you turn the thermostat..I've taken a look at the thermocouple and it looks absolutely coated. I'm pretty sure this is the problem, however, the pilot light is on continuously so I can't get in there to clean it...I've cleaned the thermocouple on my furnace before but it is relatively new and only uses a glow igntion (or whatever it's called....sorry)...never one that has a pilot light on all the time...

Do I have to shut the gas off on the line manually and let the system cool down before I access the thermocouple or is there another way to get to it?

Thanks for the help!

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If the thermocouple were bad, the pilot would go out - that's an old draft furnace like mine with a cast iron heat exchanger - parts inavailability will be the demise of these - if it's not coming on, see if someone hasn't shut off the switch (follow the powerwire), or a wire has come off the transformer from the thermostat (some thermostats have heat/cool switches inside them)

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Checked the power switch, still on. Checked the breaker box, no problem there and all the wires are secure. Is there something else that might be causing the problem?

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