[dylan4277]

Yup, a little tap with the butt of a screw driver and it works like a champ!

[Darrygolf]

This works. That save some money. Make sure that your batteries are new in your zone controlleralso.

[matpal]

Can someone please elaborate on where the fuse is found in this model?

My unit is getting no power at all, and for the life of me, I cannot find the stupid fuse to try and replace.

[MisterV]

Same issue, same solution. Weird it was such a simple fix. I didn't even unscrew the little red plate, I just tapped it with a screwdriver handle. I shut off the power to the furnace and turned it back on (we have a light switch style switch installed on the ceiling by it that I didn't even know existed until now). The lights went from slow flash red- solid green before shut off to flashing simultaneously after shut off and next thing I know I see flame. Good stuff! The manual was freaking useless but this thread worked like a charm. I didn't even know what Watchguard was or what to do about it. Thanks random website that Google steered me to!

[puchicas]

The LED lights are indicating that the primary or secondary limit switch is open (per the manual). The manual says that the limit must close within three minutes or the unit goes into a one hour watchguard. How do we correct this?

The answer by bmwsRus was the best. On mine the plate is black, the switch is at the end of a 4" rectangular plastic post. But the color of the wires are the same, I disconnected the wires, unscrewed the unit, took it out, taped the end of the switch, cleaned the rest, put it all back together and it worked great. Thanks everyone. Kudos also to Lennox, the way the screws were set slightly off center at the top made it so much easier to put back correctly.