How the preheat failure was isolated
The oven stalled at a low temperature, so the heating circuit was tested before a replacement part was selected.
Preheat stalled
LG Oven Would Not Complete Preheating
The appliance stalled at a low temperature and could not reach the heat needed for normal cooking.
Heater tested
Failed Convection Heater Identified
Diagnostic testing traced the preheat failure to the convection heater rather than a setting or user-control issue.
Temperature restored
LG Convection Heater Replaced and Temperature Tested
A compatible replacement heater was installed and the oven was tested to confirm that it reached and maintained the selected temperature.
Why this matters
Confirming the failed heater distinguishes a component fault from a setting, sensor, or control problem with a similar symptom.
