45
Control circuitry lockout
This code typically points to
- Flame-circuit failure
- Software/check-sequence error
- Gas-valve relay/control fault
Next checks to confirm
- Cycle power
- Verify flame-sense circuit and gas-valve relay behavior
- If code repeats, replace control
Escalation
Repeated code 45 after clean power reset is high-confidence control failure.
Reset behavior
Lockout behavior; reset by power cycle, but repeated recurrence indicates failed control. Auto-resets after 1 hour.
Urgent
Fix now