Troubleshoot modern appliances with confidence…

Click here to check out our structured, online appliance repair training courses for rookies and experienced techs.

FAQs | Repair Videos | Academy | Newsletter | Podcast | Contact

Stay connected with us...

Samurai on Facebook - become a fan today! Sign up for our free newsletter and keep up with all things Appliantology. Subscribe to our YouTube channel for lots of appliance repair tips and help! Follow the Samurai on Twitter and get timely morsels of Appliantological Wisdom! Subscribe to our MST Radio podcast to learn secrets of the trade.
Sign in to follow this  
Followers 0
John Martens

Lennox G8D2-82-3 Furnace

4 posts in this topic

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!

post-7787-0-14884000-1316489273_thumb.jp

Share this post


Link to post
Share on other sites

Need appliance parts? Call 877-803-7957 now!

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)

Share this post


Link to post
Share on other sites

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?

Edited by John Martens

Share this post


Link to post
Share on other sites

If you're still out there, check for 24 VAC at the transformer.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0