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Hello,My name is ***** ***** I will do my best to assist you. I am looking over your question now and will respond shortly.
what is the model number of the unit?
what happens after the 12 code?
solid light or direct to another code...the 12 should only be 90 seconds
then the circuit board itself is defective.
even if the code were reversed and was 21 the board would still be bad.
The only fix is to replace the circuit board.
you are very welcome and thank you for your patience.
Just rate service at top of page to move from active list
20 years in the field specifically on Carrier/Bryant units.
Hired by Carrier to perform troubleshooting when other companies failed.
Factory trained and fully certified State Mechanical Contractor in 2 states.
Now I work mostly with colleges, pharmaceutical, automotive and health systems.
Being old has some advantages.....