Pushed to the limit
Join Date: Oct 2002
Location: In the shadow of a big mountain
HVAC Guys, what does an aux limit switch do?
We had some really strong winds in my neck of the woods this morning ahead of a winter storm that is moving in. The wife called me at work and told me that the furnace was no longer blowing hot air. I took the LED code (31) and did some research on our model of furnace and came up with PRESSURE, DRAFT SAFEGUARD,AUX LIMIT SWITCH issue.
I came home and found the little switch near the very bottom of the flue and was able to reset it. Now the furnace works fine.
Is it safe to assume that if the switch trips again, I have an obstruction somewhere? Is it possible that the high winds tripped the switch to begin with?
Buying dogs kills.