Trane
Ht1 / Ht2
StatusHeat stage running
Status. First / second heat stage is firing.
Walk Ht1 / Ht2 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 (Ht1 / Ht2) 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
- Ht1 forever with a W2 call → staging / high-fire prove, not a ‘bad Ht1 code.’
- Ht2 with only W1 landed → W2 shorted or IFC staging on its own — confirm the call.