Bosch Dishwasher Error codes

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Bosch dishwashers are known for their performance and efficiency, which is why they are widely used in both residential and commercial kitchens. Like all modern appliances, Bosch dishwashers include a built-in diagnostic system that displays error codes when something isn’t working properly.This guide explains what Bosch dishwasher error codes mean, why they appear, what you can safely check at home, how to reset your Bosch dishwasher, and when it’s time to call a professional technician.

Where Bosch Dishwasher Error Codes Appear

Bosch dishwasher error codes appear on the digital display panel when the unit detects a fault.
    • Codes may show during filling, washing, draining, or heating
    • Some errors stop the cycle to prevent leaks or overheating
    • Most Bosch dishwasher error codes begin with the letter E followed by a number
Always note the error code before resetting or turning off the dishwasher.

Bosch Dishwasher Error Codes Explained

Bosch Dishwasher Error Code Finder

Select the Bosch error code to see what it means and what you can check first.

What this means

What you can try

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    E1 / E2 – Temperature Sensor Error

    This error indicates a problem with the temperature sensor (thermistor).Why it happens:
      • Faulty thermistor
      • Wiring or control issue
    What you can do:
      • Reset the dishwasher
    If the error returns, the sensor usually requires professional testing or replacement.

    E4 – Water Fill Error

    This error means the dishwasher is not filling with water properly.Why it happens:
      • Water supply turned off
      • Low water pressure
      • Scale buildup or sensor issue
    What you can do:
      • Make sure the water supply valve is fully open
      • Check the inlet hose for kinks
    If the error persists, internal components may need service.

    E5 – Overflow Error

    E5 appears when the dishwasher detects too much water inside the unit.Why it happens:
      • Inlet valve not closing
      • Float switch issue
    What you can do:
      • Turn off the dishwasher
      • Shut off the water supply
      • Reset the unit
    Repeated overflow errors should be handled by a technician to prevent leaks.

    E6 – AquaSensor Error

    This error indicates a problem with the AquaSensor, which monitors water cleanliness and turbidity.Why it happens:
      • Faulty AquaSensor
      • Wiring or control issue
    What you can do:
      • This error usually requires professional repair or sensor replacement

    E9 – Heating Element Error

    E9 means there is a problem with the dishwasher’s heating system.Why it happens:
      • Failed heating element
      • Heating circuit issue
    What you can do:
      • Reset the dishwasher
    If dishes are not drying or water is not heating, professional service is recommended.

    E15 – Leak Detected

    This error appears when water is detected in the base of the dishwasher.Why it happens:
      • Internal leak
      • Loose hose or connection
      • Excess detergent or overfilling
    What you can do:
      • Turn off the dishwasher
      • Shut off the water supply
    If E15 appears, professional inspection is required to locate and fix the leak.

    E16 / E17 – Water Intake Error

    These codes indicate restricted or improper water flow into the dishwasher.Why it happens:
      • Kinked or damaged inlet hose
      • Water pressure issue
    What you can do:
      • Straighten the inlet hose
      • Make sure the water supply valve is fully open

    E18 – Water Flow or Low Water Level Error

    This error appears when the dishwasher detects insufficient water flow.Why it happens:
      • Low water pressure
      • Blocked inlet filter
      • Inlet valve issue
    What you can do:
      • Ensure water pressure is adequate
      • Check and clean the inlet hose filter

    E22 – Filter Blockage

    E22 means there is standing water in the sump due to a clogged filter.Why it happens:
      • Food debris blocking the filter
    What you can do:
      • Remove and clean the dishwasher filter with warm water
      • Reinstall the filter properly

    E23 – Drain Pump Error

    This error indicates a problem with the drain pump.Why it happens:
      • Blocked pump
      • Faulty drain pump
    What you can do:
      • Check for visible blockages in the filter area
    If the error continues, the pump may need professional replacement.

    E24 / E25 – Drainage Error

    These error codes mean the dishwasher cannot drain water properly.Why it happens:
      • Blocked drain hose
      • Jammed pump impeller
      • Improper drain hose installation
    What you can do:
      • Check the drain hose for kinks or blockages
      • Clean the filter thoroughly
    Persistent drainage issues require professional repair.

    How to Reset a Bosch Dishwasher

    To reset most Bosch dishwashers:
      1. Turn the dishwasher off
      1. Unplug it or switch off the circuit breaker
      1. Wait 5 minutes
      1. Restore power
      1. Start a new wash cycle
    If the same error code returns, the issue is not temporary.

    When to Call a Professional Dishwasher Technician

    You should contact a technician if:
      • Error codes keep returning after reset
      • The dishwasher is leaking water
      • It won’t drain, fill, or heat properly
      • The unit stops mid-cycle repeatedly
    Ignoring Bosch dishwasher error codes can lead to water damage or electrical issues.

    Bosch Dishwasher Repair – Contact Alpha Tech Appliance

    Bosch dishwasher error codes help identify problems, but an accurate diagnosis often requires professional tools and experience. If your dishwasher keeps showing error codes or isn’t working properly, expert service is the safest option.Alpha Tech Appliance provides reliable Bosch dishwasher repair and installation in Toronto and the surrounding areas. Our experienced technicians handle drainage problems, heating errors, sensor failures, leaks, and control board issues safely and efficiently.Contact Alpha Tech Appliance today to book your Bosch dishwasher repair or installation service.