Trane
CoF
StatusContinuous fan
Status. G or IFC fan-on. Not a fault.
Walk CoF in Diagnose
2 plates — walk the one on the cabinet
First check
1 Confirm this is not a fault
On the Trane S8V2 this readout (CoF) 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
- If the homeowner thinks it is ‘stuck,’ check G and the IFC fan menu.
- Not a capacitor code.