Payne Furnace Code 34.2
Safety faultShown as: Major code 34 on the LED (3 short, 4 long); 34.2 on the display
Flame lost - after successful ignition (flame proved), flame was lost before the heating blower on-delay.
Manual wording: “34.2 FLAME LOST - After successful ignition (flame proved), flame lost before heating blower on delay.”
Documented for: PG80MSU
Likely causes, most common first
- Oxide buildup on the flame sensor
- Low inlet gas pressure
- Gas valve defective or turned off
- Poor control ground continuity
- Flame sensor grounded or touching the casing
- Inadequate flame carryover or rough ignition
What you can safely check yourself
- Confirm other gas appliances in the house are working normally
When to call a technician
Flame loss right after ignition is a combustion and flame-sensing problem for a technician. Do not attempt to clean or reposition the flame sensor yourself.
A Payne furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Source
- PG80MSU: Installation, Start-up, Operating and Service and Maintenance Instructions (Payne, PG80MSU 80% multipoise gas furnace with 3-digit display and pressure transducer) · checked 2026-08-25