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DeluxeMoustache · 12-27-2017, 05:45 PM

Some furnaces have a LED, mine is in the blower area, visible through a sight/ window, that flashes when the furnace trips. I have a Carrier furnace.

It was flashing three short, one long. That means code 31. On the inside of the furnace door was a chart with the furnace codes. This was related to a pressure switch.

The general recommendations were looking for reasons for low air flow - insufficient combustion air , blocked vent, etc.

In my case, the root cause was that there is a condensate trap that was clogged and full, backing up condensate in to the heat exchanger. Apparently this is common as well with some Carrier furnaces

Edit - thanks to Everlast. He was out of town when I emailed, but was very responsive and put me in contact with a tech who was in town, and came to get my problems resolved.

12-27-2017, 05:45 PM	#8
DeluxeMoustache Moustache Join Date: Mar 2010 Exp:	Some furnaces have a LED, mine is in the blower area, visible through a sight/ window, that flashes when the furnace trips. I have a Carrier furnace. It was flashing three short, one long. That means code 31. On the inside of the furnace door was a chart with the furnace codes. This was related to a pressure switch. The general recommendations were looking for reasons for low air flow - insufficient combustion air , blocked vent, etc. In my case, the root cause was that there is a condensate trap that was clogged and full, backing up condensate in to the heat exchanger. Apparently this is common as well with some Carrier furnaces Edit - thanks to Everlast. He was out of town when I emailed, but was very responsive and put me in contact with a tech who was in town, and came to get my problems resolved. Last edited by DeluxeMoustache; 12-27-2017 at 06:36 PM.