LG · Oven Moderate

F51 — Griddle sensor error

On LG ranges with a center griddle (ProBake/InstaView griddle models), the griddle temperature sensor is reading open or out of range.

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

How to fix it

  1. Power off at the breaker.
  2. Remove the cooktop to access the griddle element/sensor.
  3. Unplug the griddle thermistor and measure resistance at room temperature — should be ~1090 Ω. Replace if open or far off.
  4. Inspect harness routing under the cooktop for pinch points.
  5. Reseat connectors at the cooktop control board.
  6. If sensor and wiring are good, replace the cooktop control board.

Why it happens

Typical signs: F51 or F-51 on display · Griddle zone will not heat · Other surface burners and oven still work

  • Open griddle thermistor Center griddle sensor failed open.
  • Disconnected sensor harness Service or cleaning loosened the connector under the cooktop.
  • Damaged sensor pigtail Pinched between cooktop frame and chassis.
  • Failed cooktop control board Sensor input circuit dead.

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 griddle temperature sensor 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 — Rear Cooktop Sensor Error (Zone Varies by Model) F1 Range F1 — Upper Oven Thermistor Error

All LG codes → All oven codes →

Frequently asked questions

What does the F51 code mean on a LG oven?

On LG ranges with a center griddle (ProBake/InstaView griddle models), the griddle temperature sensor is reading open or out of range.

What causes the F51 code on a LG oven?

Open griddle thermistor: Center griddle sensor failed open. Disconnected sensor harness: Service or cleaning loosened the connector under the cooktop. Damaged sensor pigtail: Pinched between cooktop frame and chassis.

Is it safe to keep using a LG oven with a F51 error?

Yes, with caution. This is rated a moderate-severity fault.

How do I fix F51 on a LG oven?

Power off at the breaker. Remove the cooktop to access the griddle element/sensor. Unplug the griddle thermistor and measure resistance at room temperature — should be ~1090 Ω. Replace if open or far off.

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.