Thermador Oven Error Code E150: How to Fix It

Medium 45-90 minutes Medium Severity Verified June 2026
Error Code
E150
Brand
Thermador
Product Type
oven
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
45-90 minutes
Thermador error code E150 indicates a steam generator water level fault in your steam oven. This error occurs when the steam generator cannot detect proper water levels, preventing the steam cooking functions from operating correctly.
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Tools You'll Need

How to Fix Error Code E150

  1. Turn off and unplug the oven

    Always disconnect power before servicing to prevent electrical shock and burns from hot components.
  2. Check the water reservoir

  3. Inspect water level sensors

    Handle sensors carefully as they are delicate electronic components that can be easily damaged.
  4. Clean the steam generator

  5. Check water supply connections

  6. Test the water pump

  7. Reset the oven

Parts You May Need

Water reservoir
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Water level sensor
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Steam generator water pump
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Water supply line
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Water reservoir
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Water level sensor
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Steam generator water pump
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Water supply line
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Water reservoir
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Water level sensor
Check Price on Amazon
Steam generator water pump
Check Price on Amazon
Water supply line
Check Price on Amazon
Water reservoir
Check Price on Amazon
Water level sensor
Check Price on Amazon
Steam generator water pump
Check Price on Amazon
Water supply line
Check Price on Amazon
Water reservoir
Check Price on Amazon
Water level sensor
Check Price on Amazon
Steam generator water pump
Check Price on Amazon
Water supply line
Check Price on Amazon
Water reservoir
Check Price on Amazon
Water level sensor
Check Price on Amazon
Steam generator water pump
Check Price on Amazon
Water supply line
Check Price on Amazon
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When to Call a Professional

Contact a Thermador-certified technician if the water pump fails, if water level sensors need replacement, or if the error persists after cleaning. Professional service is also recommended for units still under warranty to avoid voiding coverage.

Frequently Asked Questions

What causes Thermador error code E150?
E150 is caused by water level detection problems in the steam generator, typically due to mineral buildup on sensors, a dirty water reservoir, clogged water lines, or a faulty water pump.
Can I still use my Thermador oven with error E150?
You can use regular baking and roasting functions, but all steam cooking features will be disabled until the error is resolved. The oven will continue displaying the error code.
How often should I clean my Thermador steam oven to prevent E150?
Clean the water reservoir weekly and run a descaling cycle monthly or every 50 steam cycles. Hard water areas may require more frequent cleaning to prevent mineral buildup.
Is Thermador E150 error covered under warranty?
E150 errors are typically covered under warranty if caused by component failure rather than lack of maintenance. Check your warranty terms and contact Thermador support for coverage verification.
Can hard water cause Thermador E150 errors?
Yes, hard water accelerates mineral buildup on water level sensors and in the steam generator, leading to E150 errors. Consider using filtered water and increase cleaning frequency in hard water areas.