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Old 01-14-2010, 06:29 PM   #1
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Error code 12 problem on my Carrier 58RAV


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

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Old 01-14-2010, 06:35 PM   #2
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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.

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Old 01-14-2010, 06:39 PM   #3
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Yep. 90 seconds everytime its powered up while its receiving a call for heat. It will do that.
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Old 01-14-2010, 06:52 PM   #4
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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.
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Old 01-14-2010, 06:55 PM   #5
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Don't shut the power off. Leave it run for 90 seconds, and see what other code it gives.
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Old 01-14-2010, 07:58 PM   #6
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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.
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Old 01-14-2010, 08:10 PM   #7
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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.
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Old 01-14-2010, 09:58 PM   #8
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If the problem persists you should examine the inlet side of your evaporator coil.





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Old 01-14-2010, 10:00 PM   #9
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Especially if the filter was fiberglass.

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Old 01-13-2016, 06:52 PM   #10
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Carrier Furnace Code 12


My Carrier from 2004 recently started giving me the code 12 error. The furnace would start (flames light up), run for about 45-60 seconds and then as soon as the blower came on, the furnace would stop. Eventually it didn't even get that far before it started to short cycle. I tried replacing the flame ignitor and cleaning the flame sensor and had an HVAC come out and tell me it was likely the circuit board. A new board cost $400 (just the circuit board w/ no guarantee that was the issue), so I seriously debated trying that or just going with , but I bought the board, put it in and so far so good. Just wanted to post this because I wasn't able to find too much online about the code 12 error having to do with the circuit board.
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Old 01-13-2016, 08:21 PM   #11
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Code 12 means if the thermostat was calling for heat and you interupted the 120 volts to the furnace it will start the fan. It thinks the furnace has been running and is hot and you had a power failure and it needs to cool off to prevent damage.

Code 21 is a gas heating lockout.

LOTS of people read the code wrong as the short and long flashes are close in length.

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