The light is blinking green 3 times. The legend says that means "Combustion Air Switch Failed to Close". I am not sure how to fix the issue.
I have this furnace in two of my mobile homes. In both I had to take off the inducer motor (i think that's what it's called)..it has the clear air tube attached to it. Remove the 4 screws or top two if you have small fingers and give the wheel inside at the bottom a push. These tend to stick over years of use and in both cases once freed the furnace came on. I too had 3 flashes in both cases.
SOURCE: Have a coleman furnace and
There will be a small tube that goes from the induction blower housing to the switch itself. Try to blow and **** through this tube with it attached to the switch. If you hear a click on the inside of the switch, it is good, if not, then it needs to be replaced. Another thing to try, take a small wire or paperclip and poke through the hole that the hose came off of on the housing, sometimes this gets clogged and will cause the same problem. Other than that, it will be a blocked flue or the inductive blower itself not performing properly. Hope this helps and good luck!
SOURCE: turning heater on : combustion air switch failed to close?
i just oiled my switch and made sure that it turned freely and it started working
SOURCE: Evcon, 3 flashes, combustion air switrch failed to
take the switch off and clean it really good and make sure that it turns freely that is how i fixed mine
2,623 views
Usually answered in minutes!
Got it thanks to Brandon's suggestion. We ended up having to take the switch off the mount, unscrew the square center screw, remove the spring, blow into it, spray a lil' WD40 in there, remounted and voila - we have lift off!
×