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Bosch·Oven / Rangehigh severity
Bosch Error Code E1
Control board error
Common Causes
- 1Control board failure
- 2Power surge damage
- 3Component fault
Ovens use 240V circuits. Always verify breaker is off and test terminals with a meter before touching any internal wiring.
Step-by-Step Troubleshooting
- 1
Disconnect power at breaker for 10 minutes — reset board firmware
- 2
Check incoming voltage at terminal block (240VAC for electric, 120VAC for gas ignition)
- 3
Inspect control board for visible damage — burnt traces, bulging capacitors
- 4
Verify ribbon cable connections between UI board and main board are seated
Pro Diagnostic Tip
BSH ovens (Bosch/Thermador/Gaggenau) share the same EPC control platform. Thermador PRD series uses two boards (main + UI). If E1 appears only on specific functions (convection but not bake), the relay cluster for that circuit on the main board is the failure point.
You Might Also Notice
- •Oven completely dead
- •Display shows error then goes blank
- •Partial function loss
Parts, Cost & Difficulty
Repair Difficulty
Professional OnlyEstimated Repair Cost
$350–$600
Parts + labor. Free diagnosis with repair.
Parts That May Need Replacement
12-017-943-001 (main control board)12-017-944-001 (UI/display board)
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 E1 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 E1 mean?
Bosch error code E1 indicates: Control board error. This is a high-severity issue affecting your oven / range.
How do I fix Bosch error code E1?
Disconnect power at breaker for 10 minutes — reset board firmware Then, Check incoming voltage at terminal block (240VAC for electric, 120VAC for gas ignition) Then, Inspect control board for visible damage — burnt traces, bulging capacitors 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 E1?
Besides the error code on the display, common signs include: Oven completely dead; Display shows error then goes blank; Partial function loss. If you notice any of these symptoms, check your oven / range's display panel for error code E1.
How much does it cost to fix Bosch E1?
Repair costs for Bosch E1 typically range from $350 to $600 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.