Blower On After Startup Code 12 - HVAC - DIY Chatroom Home Improvement Forum

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Old 11-16-2010, 11:15 AM   #1
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blower on after startup Code 12

Hi, I have a Carrier furnace and every once in a while you hear the fan start as it usually does as it is preparing to light and then the fan suddenly quits and it flashes a code 12. This is a "blower on after startup" message. I have read a bit about this situation before on this forum but really don't understand what to do about it. Is this something to worry about? What causes it? What course of action should I take? Thanks for any help.


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Old 11-16-2010, 05:40 PM   #2
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Means the thermostat was calling for heat. When the power was turned on to the furnace.

Check to see why its losing power(120 volt) while the thermostat is calling for heat.


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Old 11-16-2010, 05:48 PM   #3
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Probably the circuit board is dying. Broken solder joints.
"Cut it twice and it is still too short".
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