34.1
Ignition proving failure
This code typically points to
- Adequate flame sense not detected during trial for ignition
- Dirty flame sensor, weak ground, low gas pressure, bad gas valve, burner carryover issue
Next checks to confirm
- Verify flame is actually lighting
- Verify flame-sense current and clean sensor
- Verify gas pressure and ground continuity
Escalation
Repeated 34.1 after proper flame current and gas checks points toward control/valve faults.
Reset behavior
Repeated proving failures escalate to 14.1 lockout.
Urgent
Fix now