Wolf CSO Steam Oven Code E58 / U1: missing L2 leg or high L2 voltage

What E58 / U1 means

On Wolf CSO convection steam ovens, including the CSO30 series, E58 with U1 means no pole conductor is connected to the L2 clamp, a circuit breaker or fuse in the house wiring has activated, or L2 voltage is over voltage. The oven cannot run properly on its supply and shows the pair.

Common causes of E58 / U1

No pole conductor connected to the L2 clamp
Circuit breaker or fuse in the house wiring activated
L2 voltage over voltage

✓ One safe check you can try

1. Check your electrical panel for a tripped breaker for the oven. 2. Reset it once if tripped. 3. Turn the oven on and see if E58 / U1 clears. 4. If it returns, leave it off and call us. The supply connection is for licensed technicians.

! Why to stop there

The L2 connection lives inside the oven or the supply box.
A tripped breaker can hide a deeper wiring issue.
We quote in writing first and cover our work 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.

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Other Steam Oven codes

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E58 / U1E58 / U1 questions

Can a tripped breaker cause E58?

Yes. A breaker or fuse in the house wiring that activated is a listed cause.

What is L2?

It is the second leg of the oven's supply connection. The oven needs it connected and at the right voltage.

Who should check the wiring?

A licensed technician. We can check the oven side and tell you what we find.