Thermador Oven E13, CT vs CMT Dreefs Control: Frozen Latch or Board Not Converted

What E13 means

E13 has two meanings in the Dreefs service table for legacy Thermador ovens. On CT models, the latch is frozen or its motor gets no power; the second page says the latch does not run and voltage to the motor should be checked. On CMT ovens, the control board has not been converted. Heat goes off and CLEAN is disabled in both ovens. If two switches show a locked door, E13 and LOCK stay on the display.

Usual causes of E13

Latch motor receiving no voltage
Frozen latch mechanism that cannot move
Control board not converted for the CMT oven, per the source's conversion note

✓ A safe check worth trying

1. Turn the selector to OFF and tweak it slightly counterclockwise. 2. Cut power at the breaker briefly and restore it, which the document lists for E13. 3. If the door shows open and E13 clears, avoid CLEAN. 4. If E13 and LOCK stay on the display, do not force the door; switch off power and call us.

! Why you should stop here

A stuck-locked door can trap you out of the oven until the latch is serviced
Testing latch voltage means live-circuit work
We quote in writing first and confirm the right legacy version by model number

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.

→Same appliance

More Oven codes

F12F12 on a Legacy Thermador C-Series Oven: Vcc Lift-Off on the Power/Relay Board F50Older C/CM-Series Thermador Wall Oven F50: Upper Door Signal Shorted Low F1Older SC/SM-Series Thermador Wall Oven F1: Element Supervisor Enabled F13Thermador C/CM/CJ Wall Oven Code F13: Power Board Not Calibrated, Air Switch Check F51F51 on an Older Thermador Wall Oven (C/CM-Series): Upper Door Stuck Unlocked F2F2 on an Older Thermador Wall Oven (SC, SCD, SM, SMW): Temperature or Door Light During Self-Clean 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

E13E13 questions

What if E13 and LOCK stay lit?

The source says that happens when two switches show a locked door. Do not force the door or pry it. Turn the oven off at the breaker and call us so we can release and inspect the latch.

Does E13 mean something different on a CMT oven?

Yes. For CMT combination ovens the source says the control board was not converted, which is a board matter rather than a frozen latch. We confirm the model first and then test accordingly.

Will cleaning the latch area help?

Please do not spray cleaner into the door frame or latch. Moisture near switches can worsen the problem. Wipe only the visible surfaces, and let us examine the latch itself.