Dishwasher Water Level Errors: Overfilling, Underfilling & Sensor Faults

Dishwasher water level errors appear when the appliance detects too much water, too little water, or an implausible reading from the level monitoring system. The safe checks depend on whether the machine is underfilling, overfilling, foaming, or leaking.

Too Much and Too Little Water Can Share Similar Causes

A faulty level reading, foaming detergent, blocked filters, or water supply issue can confuse the control logic. The displayed code needs to be interpreted alongside what you can actually see inside the dishwasher.

Common causes

  • Closed or restricted water supply
  • Faulty inlet valve
  • Foaming from incorrect detergent
  • Blocked filters
  • Faulty level sensor
  • Water in the base tray

Safe first checks

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Safety warning

If the dishwasher is visibly overfilling or leaking, stop the programme and switch the appliance off. Close the water supply if it is safely accessible. Do not restart the dishwasher until the cause has been identified.

When to stop and call a professional

Call a professional if the level fault returns after filter, detergent, and water supply checks, or if the appliance overfills.

How this information is researched

Publisher: Error Code Lookup Editorial Team. Error Code Lookup is an independent appliance-information resource and is not affiliated with appliance manufacturers. Guidance is written in our own words and reviewed with safety boundaries in mind.

Last reviewed: 2026-08-07

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Frequently asked questions

Can foam cause a water level error?

Yes. Excess foam can confuse level sensing and trigger leak or overfill protection.

Why does my dishwasher say low water when the tap is on?

The inlet filter, valve, pressure path, flow meter, or level sensor may be restricted or faulty.

Should I keep running a dishwasher with an overfill code?

No. Turn off the water supply and investigate safely before another cycle.