"Stormin Mormon" wrote in message
...
I'm working (again) on a Heil. It's about 80K, upflow model. Older one, a
70
or 80 percenter.

Customer's complaint, keeps on running. House gets hot, and they have to
turn it off at the swtich on the side of the furnace.

He's changed the you-know-what a couple times. I pulled a wire for the
YKW.

So, the fellow called me, and it's running right along. Wants to know if
he
should change the YKW again. No, don't do that.

Last time it happened, I got him to call me right over. I pulled the main
cover, and tapped ont he box with the electric. Went right out. Aha! Relay
isn't releasing. Replace the relay.

And a couple weeks later, it's happening again. What's the odds of a bad
relay a couple months later? Not all that much.

what's the next couple things to check? Sticky gas valve would cause that
problem. Any other common problems?

--

Yeah, you working on it...