Error Code C-21

Internal Oven Temperature Abnormal Error

What This Means

Temperature sensor disconnected; Temperature sensor malfunction; Heater drive failure; Heater relay not operating; PCB software error

How to Fix

1. 1

   Turn oven off and let it cool sufficiently

2. 2

   Check if internal oven temperature reached over 350 degrees

3. 3

   Verify temperature sensor connectivity

4. 4

   Reconnect temperature sensor if loose

5. 5

   Check heater drive part and repair if necessary

6. 6

   Check relay terminal voltage (230V)

7. 7

   Power cycle oven and test

8. 8

   Replace PCB if problem persists