LG · Oven Serious

F56 — Griddle overheat

The griddle temperature exceeded the safety threshold (about 653°F / 345°C) for an extended period. The control shuts the griddle element off.

Keep using it?
Limited use only
DIY difficulty
Moderate
Verified against
lgparts.com ↗

How to fix it

  1. Let the cooktop cool fully — do not retry while hot.
  2. Press CLEAR/OFF and cycle the breaker for 60 seconds.
  3. Avoid running the griddle empty on max; that condition alone can trip F56.
  4. If F56 returns under normal use, measure griddle sensor resistance (~1090 Ω at room temp). Replace if shorted.
  5. If sensor checks good and overheat repeats, the cooktop control board (welded relay) is the next replacement.

Why it happens

Typical signs: F56 or F-56 on display · Griddle was running on high for a long time before fault · Griddle dead until cleared

  • Welded griddle relay on cooktop board Element stays on past setpoint.
  • Shorted griddle sensor reading low Element ran wide-open because the board thought griddle was cold.
  • Empty griddle on max for too long No food/oil to absorb heat.
  • Failed cooktop control board Loss of temperature regulation logic.

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.

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: lgparts.com.