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Error code reference

Bosch Range Error Code E204

Cavity 2 (warming drawer) temperature sensor shorted

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What the E204 error code actually means

Your Bosch range is showing E204 because the temperature sensor inside the warming drawer is sending a faulty electrical signal, specifically a short circuit, and the range has shut off the warming drawer's heat as a safety measure. The cooling fan may be running louder than usual as the appliance tries to manage temperatures internally. A technician will need to inspect the wiring and test the sensor to determine if the sensor itself or its wiring is the problem.

Diagnostic procedure

The full E204 procedure

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1
First diagnostic step
Check wires and connections for pinch or short circuit to ground. Check resistance of temperature sensor; if sensor tests OK, could be control module problem; if sensor fails, replace sensor.
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Most common causes of E204

Ranked by how often they cause this code
  1. 1Pinched or chafed wiring harness
  2. 2Failed temperature sensor with internal short
  3. 3Moisture or debris causing a ground fault
  4. 4Damaged or corroded sensor connector
  5. 5Faulty control module

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Questions people ask about E204

What does E204 mean on a Bosch range?
E204 indicates that the temperature sensor for Cavity 2, the warming drawer, has shorted to ground electrically. The control module cannot get a valid temperature reading from the sensor, so it shuts off all heating in the warming drawer and runs the cooling fan at high speed as a protective measure. The fault points to either a wiring problem between the sensor and the control, a failed sensor, or in less common cases, the control module itself.
Is it safe to use my Bosch range while E204 is active?
The warming drawer heating function will be disabled while E204 is active, so there is no heating risk from that cavity. The rest of the range, including the main oven and cooktop, may continue to operate depending on the model. That said, it is best to address the fault promptly rather than continue using the appliance with an unresolved sensor or wiring short.
How much does it cost to repair a Bosch range E204 error?
Repair cost depends on the root cause. If only the wiring needs to be repaired or rerouted, labor costs alone may range from around 75 to 150 dollars. A replacement warming drawer temperature sensor typically adds 20 to 80 dollars in parts. If the control module is at fault, parts and labor combined can range from 250 to 500 dollars or more depending on the specific model and service rates in your area.
Can I fix E204 myself, or do I need a technician?
A knowledgeable DIYer comfortable with multimeter use and appliance wiring can attempt to diagnose this fault by inspecting the harness for pinches or shorts and testing the sensor resistance. If the sensor has failed, replacing it is a manageable repair with the correct part. However, if the control module is determined to be at fault, that repair is more complex and typically warrants a qualified technician.
Will resetting the range clear the E204 error code?
A power reset by turning off the circuit breaker for 30 seconds and restoring power may temporarily clear the code, but if the underlying short circuit in the sensor circuit still exists, the error will return once the control module re-checks the sensor. A reset alone does not repair wiring damage or a failed sensor, so the root cause must be corrected for the code to stay cleared.

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