Error Code C-21
Oven heating over (temperature exceeds acceptable range)
Moderate
Address soon - your appliance may not work properly
What This Means
Faulty oven sensor; Defective bake relay; Faulty broil relay; Disconnected harness; Main PCB malfunction
How to Fix
- 1
Disconnect power and check oven sensor resistance (normal 1080Ω)
- 2
Check broil, bake and convection heater resistance
- 3
Verify DLB, Bake, and Broil relays working normally (normal ∞Ω)
- 4
Check all harness connections to Main PCB
- 5
Verify connector CN320 properly seated
- 6
Replace Main PCB if relays are damaged
Other Error Codes for NX58M9960P
Temperature probe sensor issue (open or short when oven operating)
Main to touch panel communication interrupted
Steam sensor open or short during steam mode operation
PCB around temperature high (safety error)
Drain system failure - water remained after max draining time
Oven sensor open (over 2950Ω) or Oven sensor short (under 930Ω)
Cooling motor operating abnormally
PCB sensor opened or shorted