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Bosch·Oven / Rangehigh severity
Bosch Error Code E2
Runaway temperature
Common Causes
- 1Relay stuck closed
- 2Temperature sensor failure
- 3Control board fault
E2 is a safety-critical code. Do NOT reset power without diagnosing the root cause. A welded relay will re-energize the element immediately on power-up, creating a fire risk.
Step-by-Step Troubleshooting
- 1
Immediately disconnect power at the breaker
- 2
Allow oven to cool completely before inspection
- 3
Check heating element relay on control board — a welded relay stays closed regardless of board commands
- 4
Measure oven temperature sensor resistance at room temp (expect 1080-1100 ohms at 70F)
- 5
If sensor reads correctly, board relay is welded — replace board
Pro Diagnostic Tip
Runaway temperature is always urgent. BSH control boards use a dedicated safety relay that should cut power independently of the main relay. If E2 triggered, the safety relay did its job — but the cause (welded main relay or drifted sensor) must be identified before resetting.
You Might Also Notice
- •Oven overheats beyond set temperature
- •Self-clean cycle does not shut off
- •Burning smell from oven cavity
Parts, Cost & Difficulty
Repair Difficulty
Professional OnlyEstimated Repair Cost
$300–$550
Parts + labor. Free diagnosis with repair.
Parts That May Need Replacement
12-017-943-001 (main control board)12-009-872-001 (oven temperature sensor/NTC probe)
Do You Have the Right Tools?
Combustion analyzer ($300), igniter tester ($120), temperature calibrator ($150), and gas pressure manometer. Our technician arrives with $15K+ in professional tools — your diagnostic is free.
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Safety First — Know the Risks
Gas ovens involve live gas lines — a loose connection creates explosion and carbon monoxide risk. Electric ovens run on 240V circuits. Our techs are licensed and insured — let them handle the risk.
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Error code E2 is a high-severity issue that can cause further damage to your oven / range if left unresolved. A licensed technician can diagnose and fix it the same day.
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Frequently Asked Questions
What does Bosch error code E2 mean?
Bosch error code E2 indicates: Runaway temperature. This is a high-severity issue affecting your oven / range.
How do I fix Bosch error code E2?
Immediately disconnect power at the breaker Then, Allow oven to cool completely before inspection Then, Check heating element relay on control board — a welded relay stays closed regardless of board commands There are 2 more steps — see the full troubleshooting guide above. This repair typically requires professional tools and expertise.
How do I know if my oven / range has error E2?
Besides the error code on the display, common signs include: Oven overheats beyond set temperature; Self-clean cycle does not shut off; Burning smell from oven cavity. If you notice any of these symptoms, check your oven / range's display panel for error code E2.
How much does it cost to fix Bosch E2?
Repair costs for Bosch E2 typically range from $300 to $550 depending on the specific cause and parts needed. EasyBear offers free diagnosis when you proceed with the repair. Call (415) 795-7300 for a same-day appointment.