Wolf Legacy E Series Code Error 09 0 4: UIM ambient thermistor shorted

What Error 09 0 4 means

A UIM Ambient Thermistor Shorted Error is what Error 09 0 4 reports on Wolf Legacy E Series wall ovens such as the SO30TE/S/TH and DO30PE/S/PH. The UIM, the user interface module, uses a thermistor to read the temperature near the display, and the control sees that sensor as shorted. You will see the code on the display, and cooking may be limited. It is a sensing problem, not proof that the oven is actually overheating.

Common causes of Error 09 0 4

The UIM ambient thermistor reading shorted
Damaged wiring or a pinched connection at that sensor
A UIM whose sensing circuit has failed

✓ One safe check you can try

1. Turn the oven off and let it cool completely. 2. Check that nothing blocks the vents around the oven. 3. Switch the breaker off for one minute and back on. 4. See whether Error 09 0 4 returns after a short bake. 5. If so, do not cook in it and call us. Do not open the control panel.

! Why to stop there

A shorted sensor reading and a real hot reading look different on a meter, and only testing separates them.
Resetting power does not repair a sensor circuit.

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 2420Wolf M Series Code 2420: Relay board RTD circuit 3C20Wolf M Series Code 3C20: High input voltage 2631Wolf M Series Code 2631: Relay board door switch circuit

Error 09 0 4Error 09 0 4 questions

What is Error 09 0 4?

The UIM's ambient thermistor reads as shorted. In plain words, the sensor that tells the control how warm it is near the display is giving an impossible reading.

Does the oven overheat because of this code?

Not necessarily, but the control cannot trust its reading, so it may limit operation. Please do not use it until we check. That is why neither reading can be trusted.

What will the repair involve?

We test the sensor circuit first. If a part is needed we tell you the price in writing before work starts, and the repair has a 30-day workmanship warranty.