Wolf Convection Steam Oven Code E42: Water temperature sensor error

What E42 means

E42 on Wolf convection steam ovens, for example the CSO30TE/S/TH or CSO2450TE/S/T, is a water temperature sensor error, shown as F2 on knob-control models. The companion code E41 points to a short circuit in the water temperature sensor or a leaking boiler. The oven cannot read the water temperature, so steam cooking may stop and the code appears on the display.

Common causes of E42

Water temperature sensor failing or loose
Wiring to the sensor damaged
Boiler problem, as the companion E41 suggests

✓ One safe check you can try

1. With the oven off, wait until it has cooled. 2. Empty the water tank and look for any water pooling under or near the oven. If you see a leak, stop and call us. 3. Refill the tank and reset the breaker for one minute. 4. Try a short steam cycle. If E42 or F2 shows up again, please call us.

! Why to stop there

The sensor sits in the boiler area, which needs a technician.
The cause is not always the sensor, and we check E41-related boiler problems as part of the visit.
The price comes in writing first.
Workmanship is warranted 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 Steam Oven codes

E26Wolf Convection Steam Oven Code E26: Climate sensor problem E87Wolf 24-Inch E Series Code E87: Exhaust slide valve jammed or shorted E87Wolf Convection Steam Oven Code E87: Exhaust slide valve stuck E26Wolf 24-inch E Series Code E26: Break or loose contact in climate sensor, or blocked duct F0Wolf Convection Steam Oven Code F0: Core temperature probe sensor problem F6Wolf Convection Steam Oven Code F6: Processor and Main Relay Error E51 F1Wolf Convection Steam Oven Code F1: Food probe error F15Wolf CSO Steam Oven Code F15: niche running too hot

E42E42 questions

What is E41?

It is the companion code, pointing to a short circuit in the water temperature sensor or a leaking boiler. If you see E41 with E42, tell us when booking.

Is F2 the same?

Yes, F2 is how knob-control models show this water temperature sensor error. It is the water temperature sensor, so water level and tank checks may be part of our visit.

Why does water temperature matter?

The control uses it to make steam safely. Without a reliable reading it stops steam cooking. The control needs it to heat water safely, so cooking stops until the reading returns.