ON SOLID
Control locked out, auto-reset after 1 hour, possible gas valve relay stuck open / flame sense circuit failure / software check error
This code typically points to
- Fuse/wiring fault
- Control fault
- Flame-sense circuit failure
Next checks to confirm
- Verify 115V, 24V at SEC-1/SEC-2, fuse, and model plug
- If ON SOLID repeats after reset, condemn control
Escalation
Replace control if repeating immediately after reset.
Reset behavior
Auto-reset after 1 hour for ON SOLID.
Urgent
Fix now