Payne Furnace Code 45.2
Safety faultShown as: Major code 45 on the LED (4 short, 5 long); 45.2 on the display
Control failure - the gas valve relay will not close.
Manual wording: “45.2 CONTROL FAILURE - gas valve relay will not close.”
Documented for: PG80MSU
Likely causes, most common first
- Failed gas valve relay on the control board
What you can safely check yourself
- Turn the furnace off at the service switch and leave it off until a technician arrives
When to call a technician
A gas valve relay that will not close means the board cannot reliably shut off gas. Shut the furnace down and call a technician; the fix is a new control board.
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