Problem summary
Your CAPLE integrated dishwasher is displaying an E4 error code, which indicates an overflow fault. This means the appliance has detected water where it shouldn't be—either in the base of the unit or at a sensor point inside the machine. The dishwasher will typically stop mid-cycle and lock out to prevent water damage.
Likely causes
Based on repair patterns, the E4 error in CAPLE models most often points to one of three main issues:
Motor failure accounts for roughly 19% of cases. If the drain motor is faulty or stuck, water cannot exit the tub properly, triggering the overflow sensor.
Heater element problems occur in about 10% of cases. A faulty heater can cause water-level control issues, leading to overfilling.
Pump malfunction is responsible for roughly 6–7% of cases. A blocked or failed pump prevents water evacuation, simulating an overflow condition.
Less commonly, the overflow sensor itself may be defective, or internal pipework could be blocked or split. The door seal can also fail, allowing water to pool at the base undetected.
Why this needs an engineer
All of the likely causes involve either sealed refrigeration/water systems, electrical components (motor, heater, pump), or internal plumbing. Attempting to dismantle the appliance or test these parts without proper equipment risks further damage and potential water leaks into your kitchen.
The error code itself is reliable: if your dishwasher is showing E4, water ingress has been detected by the safety system. You should not continue using the appliance until it has been inspected and repaired.
When to call SMC Services
Contact a qualified engineer as soon as possible, especially if:
- Water is visible pooling beneath or inside the appliance
- The error recurs after a reset attempt
- You notice any damp patches on kitchen units or flooring near the dishwasher
- The machine has not been serviced in over two years
If you're in Northern Ireland, SMC Services can usually book a repair within 2–3 working days.