Question about Carrier XHB123D X/Y Series Heat/Cool Air Conditioner
When I wake up in the morning the furnace is out and Code 12 is flashing which is blower calibration lockout. I turn off the power which resets the computer and the unit restarts and runs fine but the Code 12 reappears and it goes out again.
The unit is 19 years old.
What do you suggest?
Code 12 I believe is power up after power off and a call for heat from the the thermostat. If you have a weak door switch that may be vibrating and going on and off it would cause this as would any thing that causes the power to drop low or out then reapply its self. try holding the door switch in while watching the board and after 2 or 3 minutes the furnace should go on to lite and the blower cycle off. If it stays in this mode try turning the thermostat off (heat - OFF -cool) and then push in the door switch nothing should happen except the lite on the board come on and stay on. If it does this than have someone turn the thermostat to heat and see if it starts or put the door on and set the heat and see if *** goes through the normal cycle of heating. If however it goes right back into the blower mode and shows the 12 code your problem is still with you. So next remove the wire on the "W" terminal on the board. Retry power to the door switch and now nothing should be on except the red lite. If it tries to start the 12 code and blower up again Im pretty sure you have a bad ignition/blower control board.
Posted on Mar 09, 2009
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Posted on Jan 02, 2017
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