Wolf CSO Steam Oven Code E59 / U0: supply too high or neutral broken

What E59 / U0 means

On Wolf CSO convection steam ovens such as the CSO24 and CSO30 series, E59 with U0 means overvoltage in the mains supply. The official causes also list a neutral conductor break in the house wiring and a mains calibration error. The oven sees an unsafe supply and shows the pair rather than operate.

Common causes of E59 / U0

Over voltage in the mains electrical supply
Neutral conductor break in the house wiring system
Mains calibration error

✓ One safe check you can try

1. Switch the oven off at the breaker. 2. Note whether lights or other appliances behave oddly. 3. Restore power once. 4. When E59 / U0 returns, keep the oven off and phone us.

! Why to stop there

Overvoltage can damage electronics, so it should be sorted out.
A neutral break is a house-side issue that needs an electrician.
You get a written price first, and our repair has a 30-day warranty.

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 Steam Oven codes

U1Wolf CSO Steam Oven Code U1: L2 supply problem U2Wolf CSO Steam Oven Code U2: mains undervoltage Boiler scaled upWolf Convection Steam Oven Message Boiler scaled up: Descale required E26Wolf Convection Steam Oven Code E26: Climate sensor problem E87Wolf 24-Inch E Series Code E87: Exhaust slide valve jammed or shorted E42Wolf Convection Steam Oven Code E42: Water temperature sensor error E26Wolf 24-inch E Series Code E26: Break or loose contact in climate sensor, or blocked duct E87Wolf Convection Steam Oven Code E87: Exhaust slide valve stuck

E59 / U0E59 / U0 questions

How is E59 different from E57?

Both pair with U0. E59 starts with mains overvoltage, while E57 also names the neutral terminal and L1 above 280 VAC.

Could the utility be responsible?

A high supply is one possibility. If other appliances seem odd too, mention it to us and your electrician.

Is a calibration error a defect?

It is a listed cause, and it can be handled during a visit.