Appliance Diagnostic

LG Microwave F-3 Error Code - Keypad Short Circuit

F-3 code displays when the control panel detects continuous touch contact on any button key for over 60 seconds.

What Caused This Error?

The control system reports F-3 when the monitored condition described by the error code is outside the expected operating range. In this case, the most likely trigger is short circuit inside key pad membrane switch. Other common contributors include steam or water moisture trapped behind panel and damaged ribbon wire.

Step-by-Step Diagnostic Check

  1. Unplug microwave to remove power source.
  2. Dry control panel thoroughly with hair dryer on cool setting if steam infiltrated panel.
  3. Inspect ribbon cable connector for corrosion or damage.
  4. Replace touchpad control panel assembly.
Most Likely Replacement Part

Touchpad Control Panel Assembly

OEM Part #: MODEL-SPECIFIC

Buy Replacement Part →