Thermador CT/CMT Oven E2 (Dreefs Control): Cook or Clean Temperature Runaway

What E2 means

If E2 shows up on an older Thermador CT or CMT oven with the Dreefs control, the oven believes it overheated: above 635 F while cooking, or 32 F past target during a clean cycle. A second page of the service document gives 625 F and 890 F for the same code and points to the sensor or board. The control turns the heat and microwave off, and the message clears once the cavity cools below the runaway point with the selector OFF.

Usual causes of E2

Temperature sensor reading wrong, which the document lists first
Control board misreading a good sensor or failing to cut heat normally
Heating element or relay staying energized (a technician check the source implies by calling this a runaway)

✓ A safe check worth trying

1. Set the selector knob to OFF; a slight counterclockwise tweak should end the flashing and beeping. 2. Leave the door closed and let the oven cool fully; do not open it to speed things up. 3. If E2 stays with the selector OFF, switch off the oven's power at the breaker and call us. 4. Skip self-clean until it has been inspected.

! Why you should stop here

A true overheat is a safety matter, so repeated restarts are not a test worth running
The sensor and board are checked with meters while the oven is isolated from power
We give a written price before any part is ordered or installed

Taking off a panel yourself does not by default void a manufacturer warranty, yet it can lead to accidental damage, and some manufacturers attach their own service terms. Read your warranty paperwork, or ask us, before you decide.

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More Oven codes

F14Thermador Older C-Series Oven, Control Display EEPROM Error F14 F52Thermador Wall Oven F52 in the Legacy C/CM Family: Upper Door Reads Locked and Open F3Thermador Wall Oven F3 in the Legacy SC/SM Family: Open Oven Sensor F19Thermador Oven F19 (C/CM/CJ Legacy Models): Miscellaneous Power/Relay Board Error F53What F53 Means on a Legacy Thermador C/CM Wall Oven: Upper Door Stuck Locked F4What F4 Means on a Legacy Thermador SC/SM Wall Oven: Shorted Oven Sensor or Under 40 F F20F20 on Thermador C-Series Upper Ovens: CANCEL Key Shorted High F54Upper Latch Input Shorted: Thermador Wall Oven F54, C/CM-Series Legacy

E2E2 questions

How long until E2 goes away?

Per the source it clears when the oven temperature drops below the runaway temperature with the selector OFF. Exact time depends on how hot the cavity was, so wait until it is comfortable to be near.

Did my oven actually reach 635 F?

Not necessarily. The document names the sensor or control board, so a bad sensor can report a runaway that never happened. A technician compares the reading with a real thermometer before deciding what to replace.

Should I use the oven in the meantime?

We advise against it. The control already shut heat off once for safety, and running again before inspection risks the same shutdown or real overheating. Call us and we will schedule a look.