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Bosch·Oven / Rangehigh severity
Bosch Error Code E5
Control board communication error
Common Causes
- 1Board-to-board communication fault
- 2Wiring harness issue
- 3Board failure
Step-by-Step Troubleshooting
- 1
Power cycle at breaker for 10 minutes to reset both boards
- 2
Reseat all ribbon cables and flat-flex connectors between boards
- 3
Check ribbon cable for pinch damage or oxidized contacts
- 4
If reseating fails, swap UI board first (cheaper) — if E5 persists, replace main board
Pro Diagnostic Tip
Thermador and Gaggenau wall ovens use serial communication between UI and main boards. E5 often appears after a power surge that damages only one board. Test by swapping boards individually — the cheaper UI board is the more common failure between the two.
You Might Also Notice
- •Display works but oven does not respond
- •Buttons unresponsive
- •Intermittent E5 during operation
Parts, Cost & Difficulty
Repair Difficulty
Professional OnlyEstimated Repair Cost
$250–$650
Parts + labor. Free diagnosis with repair.
Parts That May Need Replacement
12-017-944-001 (UI/display board)12-017-943-001 (main control board)12-017-945-001 (ribbon cable)
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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Get Professional Help Now
Error code E5 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 E5 mean?
Bosch error code E5 indicates: Control board communication error. This is a high-severity issue affecting your oven / range.
How do I fix Bosch error code E5?
Power cycle at breaker for 10 minutes to reset both boards Then, Reseat all ribbon cables and flat-flex connectors between boards Then, Check ribbon cable for pinch damage or oxidized contacts There are 1 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 E5?
Besides the error code on the display, common signs include: Display works but oven does not respond; Buttons unresponsive; Intermittent E5 during operation. If you notice any of these symptoms, check your oven / range's display panel for error code E5.
How much does it cost to fix Bosch E5?
Repair costs for Bosch E5 typically range from $250 to $650 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.