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E166Miele Dishwasher

Miele Dishwasher Error E166 – Meaning, Causes & How to Fix

The appliance control system detected a condition indicating temperature sensor fault – thermistor readings are outside expected range.

Medium Severity
Low
Medium
High
Critical

Expert Verified

Reviewed by a Certified Electrical Engineer & Licensed Technician

Official Meaning

The appliance control system detected a condition indicating temperature sensor fault – thermistor readings are outside expected range.

Real-World Causes

  • 1Faulty valve solenoid
  • 2Clogged inlet filter screens
  • 3Electronic control board failure
  • 4Blocked drain pump or hose
  • 5Low water pressure in plumbing system

Symptoms

Look for these signs to confirm error E166 on your Miele Dishwasher:

  • Clicking sounds as relays activate
  • Machine pauses and displays error
  • Appliance stops mid-cycle
  • Error appears at start of cycle

DIY Fix (Safe)

  1. 1Verify household water and power supply
  2. 2Inspect hoses and filters for blockages
  3. 3Restart appliance after disconnecting power for 5 minutes
  4. 4Clean accessible filters and sensors
  5. 5Run diagnostic mode if available

Professional Action Required

  1. 1Test valves, sensors, and motors with multimeter
  2. 2Inspect wiring harness and connectors
  3. 3Replace defective pumps, motors, or sensors
  4. 4Check control board relays
  5. 5Replace electronic control board if failure confirmed

Additional Context

Load Type
Any load type
Drain Related
Depends on cycle stage
Sensor Issues
Incorrect readings possible if sensors are blocked

Frequently Asked Questions

What does Miele Dishwasher error E166 mean?
The appliance control system detected a condition indicating temperature sensor fault – thermistor readings are outside expected range.
What causes Miele Dishwasher E166 error?
Common causes include: Faulty valve solenoid, Clogged inlet filter screens, Electronic control board failure.
How do you fix Miele Dishwasher error E166?
Start with these DIY steps: Verify household water and power supply. Inspect hoses and filters for blockages. If the error persists, professional service may be needed.

Related Error Codes

Other Miele Dishwasher Errors

E342The appliance control system detected a condition indicating sensor calibration error – sensor values conflict with expected parameters
E54The appliance control system detected a condition indicating communication error – internal control boards lost connection
E98The appliance control system detected a condition indicating door or lid lock error – appliance cannot confirm door is securely locked
E243The appliance control system detected a condition indicating sensor calibration error – sensor values conflict with expected parameters
E636The appliance control system detected a condition indicating temperature sensor fault – thermistor readings are outside expected range
E667The appliance control system detected a condition indicating temperature sensor fault – thermistor readings are outside expected range
E346The appliance control system detected a condition indicating temperature sensor fault – thermistor readings are outside expected range
E989The appliance control system detected a condition indicating temperature sensor fault – thermistor readings are outside expected range

About the Author

Technical Review Team

Reviewed by certified technicians with 10+ years of Miele repair experience. Every error code is verified against manufacturer service manuals and real-world repair data.