Carrier
12
StatusBlower on after power-up
Powered up on a W call.
Walk 12 in Diagnose
7 plates — walk the one on the cabinet
First check
1 Confirm this is not a fault
On the Carrier 58SP0 this readout (12) is run status, not a lockout. Write what the display actually shows and whether W/Y/G is present at the IFC.
Expect: Idle / Ht / CF / stage+CFM words change when you apply and remove the call.
If fail: If the word never changes on a real call, the call is not reaching this IFC.
If pass: The board is alive. Diagnose the comfort complaint, not this code.
The rest of the walkthrough is Diagnose.
On the plates
- Normal after a brownout. Repeating 12 + 41 = VS calibration / static.
- Normal after a brownout. Repeating 12 + 41 on a 59SC6 → 18-speed calibration / static.
- Normal after a brownout on two-digit IFCs.
Plates that use 12
Same number, other makers
12 on Carrier is not the same code on these plates.