Miele Dishwasher Error Code F42: How to Fix It
Easy 10-15 minutes Low Severity
Verified June 2026
- Error Code
- F42
- Brand
- Miele
- Product Type
- appliance
- Severity
- Low
- DIY Difficulty
- Easy
- Estimated Fix Time
- 10-15 minutes
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Tools You'll Need
- Dishwasher salt
- Funnel (optional)
How to Fix Error Code F42
-
Check the Salt Reservoir
Make sure the dishwasher is off and cool before touching any parts. -
Refill with Dishwasher Salt
Do not use table salt or other types of salt; they may damage the water softener. -
Run a Rinse Cycle
-
Reset the Dishwasher
Always unplug the appliance before performing any electrical disconnection.
Parts You May Need
Dishwasher salt (Miele or compatible)
Check Price on Amazon
Dishwasher salt (Miele or compatible)
Check Price on Amazon
Dishwasher salt (Miele or compatible)
Check Price on Amazon
Dishwasher salt (Miele or compatible)
Check Price on Amazon
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When to Call a Professional
If the error code F42 reappears after refilling and resetting, or if the dishwasher does not dispense water during the rinse cycle, there may be a clogged salt valve or a control board issue. Contact Miele customer service or a certified technician.Frequently Asked Questions
What does Miele error code F42 mean?
Error code F42 on a Miele dishwasher indicates that the salt level in the water softener is low. The machine needs to be refilled with dishwasher salt.
How do I reset my Miele dishwasher after error code F42?
After refilling the salt reservoir, turn off the dishwasher, wait 30 seconds, and turn it back on. The error code should clear. Running a rinse cycle can also help.
Can I use regular table salt in my Miele dishwasher?
No, you should only use pure dishwasher salt (sodium chloride). Table salt contains additives that can damage the water softener system.
How often should I check the salt level in my Miele dishwasher?
Check the salt level every 1-2 months, or when the low salt indicator or error code F42 appears. The frequency depends on water hardness and usage.
Why does F42 keep reappearing after I refill the salt?
If the error returns, the salt cap may not be sealed properly, or the salt valve might be clogged. Try cleaning the cap and seal. If the problem persists, contact a professional.