Wolf 24-inch E Series Code E55: Supplementary board failure or hardware error

What E55 means

On Wolf 24-inch E Series wall ovens such as the SO24 and SO2450, E55 says the supplementary board is defective or has a hardware error. The supplementary board works alongside the main control, and when it fails the oven posts E55 and may stop functions that depend on it. Heating and display behavior vary, but the code stays until service.

Common causes of E55

A supplementary board with a hardware error
Heat or moisture damage on that board
A failing power feed to the board

✓ One safe check you can try

1. Switch the oven off and wait until it is cool. 2. Reset the breaker for one minute. 3. Try a short Bake and watch for E55. 4. If it returns, schedule service. Do not remove covers. Please do not try to power the oven back on again and again, since each attempt can stress the board further.

! Why to stop there

A hardware error cannot be reset away.
We verify the board before replacing it.
Our price is given in writing before work starts.

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.

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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 1B21Wolf M Series Code 1B21: Cooling fan triac shorted (1B21) 3521Wolf M Series Code 3521: Upper door open or unlocked in clean 1C21Wolf M Series Code 1C21: Both upper bake element DLbs open

E55E55 questions

What is the supplementary board?

It is an extra control board that supports the main control. E55 says it has failed or has a hardware error. It shares tasks with the main control.

Can a reset fix it?

Only if the cause was a passing glitch. A true hardware error returns. A passing glitch can clear, but a hardware error will not. We will tell you which of the two applies.

Is E55 urgent?

We advise having it looked at before regular use, since the oven may not control some loads correctly. Wait for the check before using it again.