LG
Reduced Microwave Output
Microwave runs but heats very slowly; food is warm but not hot after normal cooking time.
Advertisements
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Advertisements
Possible Causes
Weak magnetron, Failing inverter board (inverter models), Low line voltage to microwave, Door or waveguide leakage reducing cavity energy
How to Fix / Troubleshooting
Safety: Unplug the microwave before moving or inspecting it.
Steps:
- Power test: Heat 1 cup (250 ml) of room-temperature water on HIGH for 2 minutes. It should be very hot or boiling. If only lukewarm, output is low.
- Check power supply: Plug the microwave directly into a dedicated wall outlet (no extension cords or power strips). Avoid sharing the circuit with large appliances.
- Ventilation: Ensure vents are not blocked; overheating can cause the control to reduce power.
If heating remains weak, the magnetron or inverter is likely failing and should be replaced by a professional.
Advertisements
Repair Difficulty
Professional Required
5/5
Advertisements