LG · Oven Moderate

F45 — Fan Error

F45 (and F46) is an oven Fan Error on LG ranges — the control is not getting the expected feedback from an oven fan. LG documents it generically as a fan error rather than naming a specific fan, so check the oven fan(s) and wiring; confirm the specific fan for your model.

Keep using it?
Yes, with caution
DIY difficulty
Moderate
Verified against
lg.com ↗

How to fix it

  1. Power off at the breaker, let the oven cool, and remove the rear panel.
  2. Verify the cooling fan spins freely and there is no debris in the airflow path.
  3. Reseat the fan plug at both ends.
  4. Energize and confirm the fan spins when the oven is on; if it spins but F45 still trips, the tach lead or board is at fault.
  5. Replace the cooling fan motor if it does not run with voltage applied.
  6. Replace the main control board if voltage is missing at the fan plug.

Why it happens

Typical signs: F45 or F-45 on display · Oven shuts down with controls warm to the touch · No air at top vent slot · Code may show up only on long bakes

  • Cooling fan motor failed Bearings worn or windings open.
  • Fan blocked by insulation or debris Loose insulation, twist-ties, or packing material in the cavity above the controls.
  • Tach feedback wire broken Board sees no RPM signal even though fan spins.
  • Main board fan-drive failure Output transistor or relay failed.

Parts you may need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

  • LG oven cooling fan motor Common replacement
    Amazon →

More LG oven codes

5b 5b — Sabbath Mode active (not a fault) CF1 CF1 — Left-front cooktop sensor open/short CF2 CF2 — Left-rear cooktop sensor open/short CF3 CF3 — Right-front cooktop sensor open/short CF4 CF4 — Right-rear cooktop sensor open/short F1 Range F1 — Upper Oven Thermistor Error

All LG codes → All oven codes →

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: lg.com.