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Error code reference

Bosch Range Error Code E115

Unlocked cavity temperature too high

Bosch codesBosch range codes

Unlocked cavity temperature too high — temperature in unlocked cavity exceeds the allowable temperature; oven will stop heating and door will lock.

First step from the service manual

Check for stuck relays. Check element operation. Check temperature sensor resistance; replace sensor if necessary.

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

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What E115 means on a Bosch range

E115 on a Bosch range signals that the temperature inside an unlocked oven cavity has risen beyond the allowable threshold. This is a protective fault: when the control detects excessive heat in a cavity that is not in a locked or self-clean cycle, it interprets the condition as abnormal and responds by shutting off the heating elements and engaging the door lock. The control monitors cavity temperature through a dedicated temperature sensor (NTC or RTD type), and when the sensor reports a value above the defined limit for normal cooking operation, E115 is triggered.

The most likely hardware cause is a stuck relay on the control board. If a relay contacts weld together in the closed position, the heating element receives continuous power regardless of what the control commands, driving the cavity temperature uncontrollably high. A faulty bake or broil element that is short-circuiting can produce a similar runaway heating condition. The temperature sensor itself is also a key suspect: a sensor that has drifted out of calibration or has developed incorrect resistance characteristics may report falsely high temperatures to the control board, triggering the fault even when actual oven temperature is within a normal range.

Diagnosing E115 starts with checking relay operation on the main control board for signs of welding or arcing. The bake and broil elements should be inspected visually for hot spots, blistering, or cracks and tested for correct continuity. The temperature sensor resistance should be measured and compared against the expected resistance curve for the specific sensor used in the unit. A sensor reading significantly outside specification at room temperature should be replaced before further testing.

Source: manufacturer service documentation.

Common causes of E115

  1. 01

    Stuck or welded relay on control board

    Part replacement

    A relay on the control board can weld shut, keeping the heating element energized even after the control sends a shutoff command. This causes the cavity temperature to climb without limit and is the first component to inspect when E115 appears.

  2. 02

    Faulty temperature sensor

    Part replacement

    If the oven temperature sensor has drifted or failed, it may report falsely elevated readings to the control board, triggering E115 even when actual oven temperature is normal. Measure sensor resistance at room temperature and compare to specification; replace the sensor if resistance is out of range.

  3. 03

    Shorted bake or broil element

    Part replacement

    A heating element that is internally shorted can draw excess current and generate heat beyond what the control board is calling for. Inspect both elements visually for blistering or burn marks and test continuity.

  4. 04

    Control board failure

    Part replacement

    Beyond a single stuck relay, broader control board degradation can cause incorrect relay switching behavior or misinterpretation of sensor data, leading to uncontrolled heating and the E115 fault.

See the test procedure for each cause

Frequently asked questions about E115

What does E115 mean on a Bosch range?
E115 indicates that the temperature inside the oven cavity exceeded the allowable limit while the door was in an unlocked state. The oven responds by cutting power to the heating elements and locking the door as a safety precaution. The fault points to a possible stuck relay, a failed temperature sensor, or a shorted heating element. A technician should diagnose the root cause before the oven is used again.
Can I fix E115 on my Bosch range myself?
Some steps, such as inspecting the heating elements for visible damage or checking if the oven sensor resistance is within specification, are within reach of a skilled DIYer with a multimeter. However, diagnosing and replacing a stuck relay on the control board typically requires disassembly and component-level knowledge that most homeowners should leave to a qualified technician. Attempting repairs on live electrical components without proper training is a serious safety risk.
Is it safe to use my Bosch oven while E115 is displayed?
No, you should not use the oven while E115 is active. The fault indicates a potential runaway heating condition, and the oven has locked itself to prevent a hazard. Using the oven before the underlying cause is identified and corrected risks fire or further damage to the appliance.
Will resetting my Bosch range clear the E115 code?
A power cycle, such as unplugging the range or tripping the circuit breaker for a few minutes, may temporarily clear the error code. However, if the underlying cause (a welded relay, a bad sensor, or a faulty element) is still present, the fault will return, often quickly. A reset alone is not a repair and should not be treated as one.
How much does it cost to repair a Bosch range showing E115?
Repair costs depend on which component has failed. A replacement temperature sensor is generally an inexpensive part, with total repair costs including labor typically ranging from around $100 to $250. A control board replacement is more costly, often ranging from $300 to $600 or more depending on the model and labor rates in your area. Getting a diagnosis from a certified technician before purchasing parts is advisable to avoid unnecessary expense.

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