Hello everyone, It's getting colder in my house every minute
I have Carrier 58TUA furnace
It work great until yesterday when I've noticed that it never turns
off for some reason
I got new thermostat first but quick fix failed
I can only turn it off using switch on the furnace

LED error code is 12

BLOWER ON AFTER POWER UP (115 VAC or 24 VAC) -Blower runs for the
selected blower off-delay time, if unit is powered up during a call
for heat (R-W/W1 closed) or (R-W/W1) opens during blower on-delay

Is that control board went bad?

Thanks ahead