LG WCES6428N wall oven repair

Reading the model

The WCES6428N is listed as an LG STUDIO combination wall oven. A combination unit pairs an upper and a lower cavity in one cutout. Each cavity has its own thermistor and door lock logic, so a message may refer to just one side.

Upper or lower?

LG ranges name the cavity in their messages. An upper oven sensor message is at code F1; a lower oven sensor message is at code F4. Door lock trouble in the upper oven is at code F10, and for the lower oven at code F20. Writing down which cavity you were using when the message appeared speeds things up.

Built-in installation facts

A wall oven is mounted in a cabinet with a power supply hidden behind it. Taking it out requires two people and care for the cabinet and floor. In San Francisco, we plan for stairs, tight kitchens and cabinet panels that may need protection. Please tell us if the oven sits above a drawer or beside a pantry tower.

Heat and fan complaints

Cold spots, a tick sound from the cooling fan after use and a fan that never stops are common reports. A convection fan fault is described at code F17. These are diagnosed from the outside first, then with the unit pulled out if the finding calls for it.

Steps for you, then us

Let the oven cool, check the breaker, and clean the door glass edges so the door closes fully. Do not run a self clean if a message is on the display. Book through LG range and oven repair and read the LG ranges and ovens overview. We estimate in writing, and you approve before any repair.

Care between visits

Wipe spills once the oven cools, keep the vent gaps near the top clear and avoid hanging towels on the handle. Heavy buildup near the door seal can make closing harder and lead to uneven heat. When you use self clean, remove racks and loose items as the manual advises and open a window if the kitchen has no hood.

Because the unit pairs two cavities, try each one separately and tell us which behaves differently. That single detail often halves the time to diagnosis.

Frequently asked questions