Error code 12 problem on my Carrier 58RAV

analog414

I have a "blower on after startup (115v or 24v)" error 12 going on. When I shut down the power for 15 minutes and restart. The unit right away starts the blower and thats it! No attempt to ignite at all. The blower just blows colds air and does not stop. Any suggestions on this would be great. I just need a fishing pole. Thanks Rick

yuri

That is normal. let it blow for 90 seconds which is what that is designed for. If it is calling for heat when you turn power on/off that is what it is supposed to do. That cycle should stop and then try to start the burner. Check for error code after that.

beenthere

Yep. 90 seconds everytime its powered up while its receiving a call for heat. It will do that.

analog414

I should have added that this problem went on all day long. Cold air for 10 hours. No heat. 58 degrees. I tried to shut off the power just to see if anything new would happen.

beenthere

Don't shut the power off. Leave it run for 90 seconds, and see what other code it gives.

yuri

Probably an open or blown limit control. Check for an auxiliary one mounted on the fan housing (counterflow furnace) with a manual red reset button. Clean your air filters and makes sure all vents are clean and open.

analog414

Interesting. Blower ran 90 seconds. Then code 33 starting blinking. Then the glow stick lit and flames. But that only lasted 3 minutes as the flames went out and it blinked 33 again. But a minute or so later the glow stick started and flames. This went on maybe 5 minutes and then cycled all over again. I did change the filter. It was dirty but it has been worst before. It appears that I have heat. Never looked at the furnace in action before. I assume it never cycled back to heat hence the 58 degrees when i got home. Maybe and hopefully it was just the filter. Thanks so much for the replies.

Houston204

If the problem persists you should examine the inlet side of your evaporator coil.

Houston204

Especially if the filter was fiberglass.