8531 Limit Switch Wiring ?
Am in the middle of a battle trying to swap out the limit switch from my spare 8531-lll I got from a guy, and the OEM 8531-ll in my Class C. I managed to get at the switch in the lll, but no luck y...
Forum Discussion
enblethen wrote:
Have you tried shorting the thermostat wires together? Once shorted the furnace should run and produce heat, Separating the wires, it should go into cool down mode and shut off.
Yes that all works as it should. The problem is that very soon after it gets going it stops for a few seconds, then sparks and goes again some more for a few minutes, then quits and waits for a few seconds then sparks and gets going again. It does that all the way up till it hits set temp and then it cycles as it should. (Digital tstat so not much range high and low setting)
I tried it with no Tstat, joining the wires to the Tstat, and it did the same thing, so it is not a Tstat issue. I already have the lll's circuit board in there instead of the ll's. I forget what the ll's did that I changed them. I have a mix of ll and lll parts in there now forget which is which!
A couple times on the restarts on the way up, it does a bang on getting going after the spark, so it sounds like a little "delayed ignition", which I think is scary. I have been living with the restarting problem for a couple years now, but this occasional delayed ignition added to it lately means I have to fix it.
