Skip to main content
Error code reference
LG Range Error Code C-21
Oven heating over: safety error indicating oven overheating condition.
SourceElectric Range NE59*685*** - Service Manualp. 36
Diagnostic procedure
The full C-21 procedure
Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.
MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
Disconnect power, open back cover, disconnect sensor from wire harness, measure sensor resistance (1080Ω at room temperature); check broil, bake and convection heater resistance; check DLB, Broil, Bake and Convection heater relays on Sub PCB; check wiring connections on Main PCB; check oven sensor connector resistance on Main PCB (Normal: 2850Ω).
SourceElectric Range NE59*685*** - Service Manualp. 36
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
Unlock C-21 procedure $9.95
Or subscribe: $29/month for all codes plus Max diagnostics, with 70 Max messages a day. Plus applicable tax.
Where this code is documented
1 manual in the MyPros+ library documents this code for LG range.
Models covered by the manuals that document this code
75,000+ service documents · 20,000+ error codes · 100+ brands
Get Started$29/month · Cancel anytime · Or $9.95 3-day pass · Plus applicable tax