Wolf Legacy E Series Code Error 09 0 3: UIM ambient thermistor open

What Error 09 0 3 means

Error 09 0 3 on Wolf Legacy E Series wall ovens such as the DO30TE/S/TH and SO30PE/S/PH is a UIM Ambient Thermistor Open Error. The UIM, the user interface module, measures the temperature around itself, and the control sees that sensor as open, as if its circuit were broken. The display shows the code, and the oven may stop or limit cooking. It is a sensing problem, not a sign that the cavity itself is too hot.

Common causes of Error 09 0 3

The UIM ambient thermistor reading open
A loose or broken connection to that sensor
A UIM whose sensing circuit has failed

✓ One safe check you can try

1. Turn the oven off and let the control area cool. 2. Make sure vents around the oven are clear. 3. Reset the breaker for one minute, then on. 4. Try a short bake and watch for Error 09 0 3. 5. If the code returns, call us. Please leave the control and panels closed.

! Why to stop there

An open sensor reading needs a measurement to tell a wiring problem from a bad module.
Running without a trusted temperature reading can let the control overheat.

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 1831Wolf M Series Code 1831: Upper door lock relay open 3311Wolf M Series Code 3311: Upper thermal cutoff open 1A31Wolf M Series Code 1A31: Upper left convection fan triac open

Error 09 0 3Error 09 0 3 questions

Explain Error 09 0 3 to me.

The thermistor that measures ambient temperature at the UIM reads open, like a broken wire. The control cannot trust its temperature reading there. We test the sensor circuit before deciding.

How is it different from Error 09 0 4?

09 0 3 is the thermistor reading open. 09 0 4 is the same sensor reading shorted. Both mean the ambient reading is unusable. Either way the ambient reading cannot be used.

Can heat in the kitchen cause it?

Heat alone shows up as an overtemperature code, not an open sensor. If 09 0 3 persists after a cool-down, we should test the sensor circuit. We quote in writing first.