Payne Furnace Code 45.3
Soft lockoutShown as: Major code 45 on the LED (4 short, 5 long); 45.3 on the display
Control failure - EEPROM memory issue on the control board.
Manual wording: “45.3 CONTROL FAILURE - EEPROM memory issue.”
Documented for: PG80MSU
Likely causes, most common first
- Corrupted or failed memory on the control board
What you can safely check yourself
- Turn the furnace off at the service switch for a minute and back on once
When to call a technician
If the code repeats after cycling power, the control board has to be replaced by a technician.
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