Bosch Range Error Code E302

E302 means the temperature sensor on the control module has detected that the module's temperature has exceeded its safe operating limit. In response, the range automatically shuts off all heating elements and runs the cooling fan at full speed to protect the control electronics. The code points to a problem with airflow, the cooling fan, a stuck heating element relay, or the control module itself. Normal operation will not resume until the underlying cause is corrected.

The range has disabled the heating elements as a protective measure, so cooking is not possible while E302 is active. Continued attempts to operate the appliance without resolving the fault could lead to permanent damage to the control module. It is best to stop using the range and diagnose the cause before restoring power for normal use.

Repair costs vary depending on the root cause. Clearing a ventilation obstruction or reseating a loose connector involves little to no parts cost, though a service call fee will apply if a technician is needed. Replacing a cooling fan typically falls in a lower to mid cost range, while a failed control module is the most expensive scenario and can run significantly higher for parts and labor combined. Getting a diagnosis first helps narrow down the actual cost.

Some causes of E302 are accessible to a knowledgeable DIYer. Checking the cooling fan for operation, inspecting ventilation trims for blockage or damage, and verifying wiring connections are all reasonable first steps. However, diagnosing a stuck relay or a failed control module temperature sensor involves working with live electrical components and internal circuitry, which is safer to leave to a qualified technician.

Cycling power to the range may temporarily clear the fault code if the control module has cooled down sufficiently, but the error will return if the underlying cause has not been fixed. A non-functioning cooling fan, blocked ventilation, or a stuck relay will continue to drive module temperatures above the limit and re-trigger E302. A reset is useful for confirming the fault is persistent, but it is not a repair.