Key Takeaways
- Inner tub leaks (cracked sump or tub) are the most expensive and least worthwhile repair
- Control board failure on 12+ year machines with discontinued parts = replace
- Persistent rust inside the tub indicates corrosion that will only worsen
- If the machine has needed 3+ repairs in 12 months, it is in systemic decline
The Bottom Line
Most Miele dishwasher repairs are worth doing — they are reliable machines with long parts availability. The exceptions are inner tub damage, control board failures on very old models, and machines with recurring multi-system problems.
Repairs That Rarely Make Sense
Inner Tub or Sump Leak
If the stainless steel inner tub has developed a crack or pinhole (often from corrosion at a weld point), or if the sump assembly (the base of the wash chamber) is leaking, the repair involves major disassembly and expensive parts. Cost: From $400. On a machine over 10 years old, this repair approaches or exceeds the 50% replacement threshold.
Circulation Pump Motor on Old Machines
The main circulation pump is the component that creates water pressure during the wash cycle. When the motor fails (not just a blockage), replacement costs From $300. This is worthwhile on machines under 10 years old but questionable on older units where the pump seal, impeller, and other components are also ageing.
Control Board (Discontinued Model)
If the electronic control board has failed and Miele no longer manufactures the replacement, aftermarket boards are unreliable and may not have all features. Refurbished boards are available for some models but come with limited warranties. If the board is genuinely unavailable, the machine cannot be repaired.
Red Flags That Mean Replace
- Rust inside the tub: Orange staining on the tub walls or around the spray arm mounts indicates corrosion. This worsens progressively and will eventually cause leaks.
- Three or more repairs in 12 months: The machine is in cascading failure mode. Each repair reveals the next weak point.
- Machine is 15+ years old with a major problem: At this age, parts availability becomes uncertain and multiple components are nearing end-of-life simultaneously.
- Water damage from repeated leaks: If the machine has caused floor or cabinet damage more than once, replacing it (and possibly upgrading to a model with better leak protection) is prudent risk management.
Always Worth Repairing
These common repairs are economical at any age:
| Repair | Cost |
|---|---|
| Door seal | From $80 |
| Drain pump | From $150 |
| Inlet valve | From $100 |
| Door latch / handle | From $80 |
| Spray arm replacement | From $40 |
| Filter housing | From $60 |