I have a Carrier weather maker 8000,
Last week it stopped working, flashed code 13 - limit circuit lockout. We tried several of the tips shown on this website, but the only thing that worked was to run the furnace with both the filter out, and the top grill off, exposing the blower wheel etc.
We called a Pro in, and he said it was due to restricted air flow, and all we would have to do was get our ducting cleaned and it would be fine.
Ducting was cleaned, the furnace worked great.
Now, a week later, its doing the same problem, BUT, now its blinking code 34 - Ignition Proving Failure, which isnt true, because the flames ignite, they just turn off after 5 seconds. I took the filter off, left the top grill on, and it works...
So the furnace works great, as long as we dont have a filter in it. THe LED light stays solid and its all good... But why would the furnace blink code 34 (and yes, I checked repeatedly that it was 4 flashes and not 3) and not 33?
The only variable this time should be the filter hence air flow.
Any tips before I have to call a Pro in again?