Error Code C-31
Safety interlock triggered - excessive temperature detected
Critical
Stop using immediately - risk of damage or safety issue
Also displayed as: C-31
What This Means
NTC sensor malfunction; Faulty heater relay; Stuck relay contacts; PCB circuit pattern damage
What actually causes this:
Defective temperature sensor or stuck heater relay causing continuous heating
First Thing to Check
Check NTC200 sensor resistance (3200Ω at room temperature); check relay function
Parts Involved
How to Fix
- 1
Disconnect power and open back cover
- 2
Check NTC200 sensor status for breaks or soldering issues
- 3
Check heater relay resistances at positions 1-2 and 2-3
- 4
Check for open or short conditions in relay circuits
- 5
Inspect PCB for damaged pattern or components
Other Error Codes for NV51M9770SS
Steam drain pump circuit malfunction
Main and Sub processor communication link failure
Display/touch panel communication failure
Oven temperature control failure - overheating
Temperature probe circuit fault
Steam generation temperature sensor circuit open
Keypad control circuit short circuit
Oven temperature sensor malfunction