Wolf M Series Code 0C20: Lower Right Convection Fan Triac Has Shorted

What 0C20 means

On M Series Wolf ovens (the SO30TM and DO30PM families and the 2019 and later SO3050 line), code 0C20 reports that the lower right convection fan triac is shorted; it is the alternate for 0932. With the triac failed closed, the control has lost its ability to stop that fan on command. Owners see 0C20 and may notice the lower cavity fan running when it should be still, or heating that feels unbalanced.

Common causes of 0C20

Shorted triac on the lower right convection fan
Control board output stage damaged by the short
Voltage spike in the supply line

✓ One safe check you can try

1. Turn off the oven; do not open the door to speed things along. 2. Shut off the oven breaker for about a minute before turning it back on. 3. Try a short cycle to see if 0C20 comes back. 4. Persisting 0C20 is our cue; please keep the oven off until we arrive.

! Why to stop there

The triac sits on the control board output, so it is not a part you can swap off a shelf.
A fan that cannot be controlled can strain its motor and throw off cooling and heat balance.
The work we do is guaranteed for 30 days.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

→Same appliance

Other Wall Oven codes

0121Wolf M Series Oven Code 0121: upper right convection relay shorted 0221Wolf M Series Code 0221: Upper Bake Element DLB Shorted 0321Wolf M Series Oven Code 0321: Broil Relay Shorted on the Upper Element 0421Wolf M Series Code 0421: upper left convection relay shorted 0630Wolf M Series Oven Code 0630: Auxiliary DLB Shorted 2820Wolf M Series Code 2820: Relay board door lock relay circuit 0021Wolf M Series Code 0021: Bake Element Relay Shorted 2A30Wolf M Series Code 2A30: Microprocessor communication failure

0C200C20 questions

What is 0C20 on my oven?

The triac that drives the lower right convection fan is shorted. The same problem also appears as 0932 on some ovens, so you may meet either number.

Does 0C20 matter if the oven still heats?

Yes. The lower right convection fan may run without control, which can wear the motor and disturb airflow and cooling. We recommend a check soon.

Will the breaker clear 0C20?

You can try one reset. A real short returns, and then we test it, quote in writing and repair only once you approve. Our technician starts from 0C20 on the screen, so you only pay for what is needed.