Hello I am hoping someone could help me on this site. It looks to be very friendly and helpful!

I have a Nordyne M1MB gas furnace that blinks twice which means the pressure switch is stuck open with the inducer blower on. This is about all the information I can find so far.

I am wondering if anyone can give me some advice on troubleshooting this problem. I have read the other posts here and on other sites but nothing that seems to help. Thanks for your time. :D

Tech info
Please look through all this info and copy to your computer for future reference
Locate the pressure switch and inducer blower. When comfortable with locations and other aspects of the furnace post back. PS the service manual has a boat load of info.


http://www.nordyne.com/Literature/713a.pdf

Install instructions +

http://www.nordyne.com/Literature/7086720.pdf

Addendum

http://www.nordyne.com/Literature/7086730.pdf

Replacement parts

http://www.nordyne.com/Literature/707977d.pdf

Repair/service manual.

http://www.nordyne.com/Literature/690a.pdf

More wiring

http://www.nordyne.com/Literature/710150.pdf

MORE

http://www.nordyne.com/Literature/707764.pdf

Take the vacuum hose off and suck and blow on it with your mouth or a hand vacuum pump. This will limber it up after not being used all summer. If this does not work, check for restrictions in the hose and barb fittings and then replace the switch with one of the same pressure setting. The vacuum/pressure switch is one of the weakest links in the furnace most companies have a few problems with the pressure switch which is used to prove combustion venting.