Payne Furnace Code 45.1
Soft lockoutShown as: Major code 45 on the LED (4 short, 5 long); 45.1 on the display
Control failure - flame circuit fault, memory mismatch, or sequence error on the control board.
Manual wording: “45.1 CONTROL FAILURE - flame circuit fault, memory mismatch or sequence error.”
Documented for: PG80MSU
Likely causes, most common first
- Internal control board failure
What you can safely check yourself
- Turn the furnace off at the service switch for a minute and back on once - the label says to cycle power
When to call a technician
The label says that if code 45 repeats after cycling power, the control must be replaced.
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