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E780Miele Washer

Miele Washer Error E780 – Meaning, Causes & How to Fix

The appliance control system detected a condition indicating communication error – internal control boards lost connection.

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 communication error – internal control boards lost connection.

Real-World Causes

  • 1Water supply valves not fully open
  • 2Faulty valve solenoid
  • 3Loose wiring harness
  • 4Kinked or bent hoses restricting water flow
  • 5Low water pressure in plumbing system

Symptoms

Look for these signs to confirm error E780 on your Miele Washer:

  • Error appears at start of cycle
  • Machine pauses and displays error
  • Appliance stops mid-cycle
  • Slow filling or draining

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 Washer error E780 mean?
The appliance control system detected a condition indicating communication error – internal control boards lost connection.
What causes Miele Washer E780 error?
Common causes include: Water supply valves not fully open, Faulty valve solenoid, Loose wiring harness.
How do you fix Miele Washer error E780?
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 Washer Errors

E346The appliance control system detected a condition indicating drain system failure – water cannot be removed properly
E84The appliance control system detected a condition indicating motor control error – the controller cannot communicate with drive motor
E187The appliance control system detected a condition indicating drain system failure – water cannot be removed properly
E409The appliance control system detected a condition indicating fan motor failure – cooling or ventilation fan not operating
E950The appliance control system detected a condition indicating communication error – internal control boards lost connection
E563The appliance control system detected a condition indicating communication error – internal control boards lost connection
E675The appliance control system detected a condition indicating communication error – internal control boards lost connection
E401The appliance control system detected a condition indicating communication error – internal control boards lost connection

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.