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Error code reference

Thermador Oven Error Code E13

CT ovens

Thermador codesThermador oven codes

CT ovens — latch frozen or no power to latch motor; CMT ovens — control board not converted.

First step from the service manual

Turn off power supply momentarily and back on again; if two switches show locked door, E13 and LOCK are permanent in display; if two switches show open door, tweak away the E13 error message.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What E13 means on a Thermador oven

Error code E13 on a Thermador oven signals a problem with the door latch system, though the exact nature of the fault depends on the oven model type. On CT (conventional) ovens, E13 indicates that the latch mechanism is either frozen in position or that the latch motor is not receiving power. On CMT (convection microwave) ovens, the code means the control board has not been properly converted, pointing to a configuration or setup issue rather than a mechanical failure.

The door latch system is a critical safety component tied to the self-clean cycle. During self-clean, the oven must confirm the door is locked before allowing high-heat operation. Two switches within the latch assembly communicate door status to the control board. When the board detects a conflict or loss of signal from these switches, it triggers E13 and may also display LOCK on the panel. If both switches report a locked door, the error and the LOCK indicator become permanent until the underlying fault is resolved. If both switches report an open door, the error can be cleared through a reset procedure.

Common mechanical causes include a latch motor that has seized, a broken or disconnected wiring harness leading to the motor, or a latch bar that has become physically stuck due to debris or warping from heat exposure. On CMT models, the cause is fundamentally different: the control board requires a conversion process specific to that oven configuration, and skipping or incorrectly performing that step produces the E13 code regardless of latch condition.

Source: manufacturer service documentation.

Common causes of E13

  1. 01

    Latch motor not receiving power

    Part replacement

    The latch motor may have a broken wire connection, a blown fuse on the circuit, or a failed relay on the control board cutting off power to the motor. Check for voltage at the motor connector during a lock command to isolate whether the problem is upstream or in the motor itself.

  2. 02

    Frozen or seized latch mechanism

    Part replacement

    The latch bar can become physically stuck due to heat warping, grease buildup, or a mechanical obstruction. Inspect the latch for visible damage or resistance when attempting to move it manually with power disconnected.

  3. 03

    Failed door latch switch

    Part replacement

    If one or both of the door position switches inside the latch assembly have failed, the control board receives a conflicting or absent signal and triggers E13. The permanent display of both E13 and LOCK is a strong indicator that the switches are reporting a locked state incorrectly.

  4. 04

    Control board not converted (CMT ovens only)

    Wiring / connection

    On CMT convection microwave models, the control board must go through a specific conversion procedure for the oven configuration. If this conversion was never completed or was done incorrectly, E13 will appear at startup regardless of the physical latch condition.

  5. 05

    Wiring harness damage to latch motor

    Part replacement

    Heat exposure over time can degrade the insulation on wires running to the latch motor, causing shorts or open circuits. Visually inspect the harness near the latch assembly for melted, pinched, or broken wires.

See the test procedure for each cause

Frequently asked questions about E13

What does E13 mean on a Thermador oven?
E13 indicates a door latch fault. On CT conventional ovens, it means the latch is frozen in place or the latch motor is not receiving power. On CMT convection microwave ovens, it means the control board has not been properly converted for that model configuration. The error may appear alongside a LOCK indicator on the display.
Will resetting the power clear the E13 error on my Thermador oven?
A power reset is the recommended first diagnostic step. Turn off the oven at the circuit breaker or unplug it, wait a moment, and restore power. If both door latch switches show the door as open after the reset, the E13 error can be cleared. If both switches indicate the door is locked, E13 and the LOCK display will return and remain until the underlying latch problem is repaired.
Is it safe to use my Thermador oven while E13 is displayed?
Normal baking and cooking functions may still operate, but you should not attempt to run the self-clean cycle while this error is active. The latch system is a safety interlock for self-clean operation, and a fault in that system means the door may not lock reliably at high temperatures. Address the latch issue before using the self-clean feature.
How do I fix E13 on a Thermador oven?
Start by power cycling the oven to determine whether the latch switches are reporting the door as locked or open. If the door appears open per the switches, clear the error and monitor for recurrence. If the latch is physically stuck, inspect the mechanism for obstructions or heat damage. A faulty latch motor, failed switch, or broken wiring harness will require part replacement. On CMT models, verify that the control board conversion procedure has been completed correctly.
How much does it cost to repair a Thermador oven showing E13?
Repair costs vary depending on the failed component. A replacement latch motor or switch assembly typically falls in the range of $50 to $150 for parts alone. If the control board requires replacement or a service technician is needed to perform a CMT board conversion, total costs including labor can range from $150 to $400 or more depending on your location and the extent of the damage.

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