Carrier furnace diagnostic code 31 or 3-1.

I misstated "three long blinks followed by one short blink" I should have said "three short blinks followed by long blink".

[bradymcneese]

It’s 15 degrees outside and my house temp was down to 60. So I was a little panicked. I figured out the code it was indicating which led me to your video. I followed your instructions and it worked beautifully! Many thanks for your help sir. God bless.

[CreateandKaptivate]

Thanks man!! My furnace wouldn't start, I was getting the code 31, watched your video, tried what you did and my furnace started working.

[GenX-Memories]

Here's a tip for folks with a 3-3 code: I cleared the tube like this video suggested, but after viewing a Carrier HVAC website, I ALSO removed the (in my case) Trion AirBear filter and let the furnace run for a bit for without a filter. No codes. I didn't have a spare (I know, I know), so I took the old one outside and vigorously slammed it on the ground - with each slam a TON of dust came out both sides of the filter. Did this for about two minutes and then re-installed the filter - no more codes. So in my case it was simply a full filter.

[halfcentsworth]

Thanks for posting this! My Bryant furnace had the code 31 and the square tube was the problem!

[richardlabat]

some of these air switches has two contact - one on the front one on the back check both! On my Carrier unit the yellow jumper powered both switches - then there was a brown (signal to control board) and orange (signal to control board) two different outputs signals. Inducer housing pressure and collector box pressure (check all 3 tubing- green, black, and black square tubing vacuumed sensing signal). Blow them out (toward the inducer housing) and you can check them with a OHM meter by gently sucking on the hose and hearing them click. Make sure the hoses are good and tight - a very small vacuum leak can cause them to not work!

[gtp]

They also have a bulletin about enlarging the hole on the inducer and taking of the inducer and bending the tabs down on the secondary

[MichaelDirk]

I arrived at the same conclusion last night and it seemed to work. We'll see over the next few days.

[JamesLee-xjjc]

Wow. This just worked for me. Thank you!!!!

[TDinosor]

We have the same issue it is happening only after 2 am.
HVAC service company can’t figure out charged us $375 putting the blame on the thermostat.

[sambone]

This exact thing, thanks bud I appreciate the vid.

[davejohnson]

Just fixed identical issues on same brand, watching your video, mine was installed brand new in january 2016, stay away from bryant thank you.

[sandk]

Thanks for the video. This was exactly my problem too!

[fapatech]

"Facepalm" dobt! thanks for the video, I had same problem.

[johnish]

So dumb when people who have no clue what they doing touches there Heater bet u it clonks out again and u paid someone to come fix it was prob a clogged drain or collection box