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jay235 04-25-2012 09:30 AM

Lennox 80MGF3-75A Inducer Port Clogged

When the t-stat calls for heat, the fan starts and then after about 1 min. it stops. Control board shows diag2 flashing, diag 1 off - which indicates pressure switch opened due to reduced air flow or a blocked condensate drain.

When I remove the tube between the pressure switch and inducer(fan), I can blow on the tube to the pressure switch and it works. The inducer side port(nipple) is clogged completely. I tried to suck and pinch on the tube while starting the furnace, and it comes up so I know furnace is working.

I tried to clear the port with a paper clip, thin nail. But it won't go through. Seems to be solid clogged. I wanted to know should the paper clip go all the way through? Any suggestion on how to clear the port?
I also checked the vent to the roof and it's clear.


Marty S. 04-25-2012 11:21 AM

Use a small drill bit

jay235 04-25-2012 01:11 PM

It worked.
Thanks for the information. I was able to use a small bit and drill through. The furnace fires right up.

I used a 7/16" bit. I think I should get a slightly larger bit and make the hole bigger so that it doesn't get clogged up again.

carmon 04-25-2012 06:00 PM

I would not make hole bigger..... clean it once a year and you will be fine...:thumbsup:

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