What this error means
Pressure switch or temperature sensor fault — the water level or temperature monitoring system has failed
The E04 error on a Beko dishwasher covers a fault in either the pressure switch (water level sensor) or the temperature sensor. A pressure switch fault means the machine cannot determine the correct water level. A temperature sensor fault means it cannot manage wash temperature. Common causes are a blocked pressure hose, a failed pressure switch, a failed NTC thermistor, or wiring faults to either component.
What you'll need first
Add all tools to Amazon basket →Affiliate links — we may earn a small commission at no extra cost to you.
Step-by-step
Symptoms to look for
- Machine fills then pauses for an unusually long time before beginning to wash
- E04 displayed during the fill phase — pressure switch fault likely
- E04 displayed during the wash or heating phase — NTC thermistor fault likely
- Machine behaviour is inconsistent — sometimes completing normally, sometimes faulting
Diagnostic steps
Run a Quick Wash and observe when E04 appears. If the fault appears during the fill phase, the pressure switch is the most likely cause. If E04 appears during the wash phase when heating is active, the temperature sensor is more likely.
With the dishwasher unplugged, remove the lower kickplate panel. Locate the narrow pressure hose running from the water level chamber up to the pressure switch. Check the full length for kinks, cracks, or disconnection. Disconnect both ends and blow firmly through — airflow must be completely unobstructed. Clear any detergent residue from the hose stubs with a cotton bud.
With the hose disconnected and the wiring connector removed, test across the switch terminals. Blow gently into the hose port — you should hear a faint click as the switch activates and the resistance reading should change. A switch that shows OL in all states with no change must be replaced.
The NTC temperature sensor is typically in the sump area, connected by two thin wires. Disconnect its connector and test across the terminals. At room temperature a healthy Beko dishwasher NTC reads between 4,000 and 12,000 ohms. A zero or OL reading means the sensor has failed.
Inspect the wiring connectors to both the pressure switch and the NTC thermistor. Both must be fully seated with no corrosion on the pins. Disconnect and firmly reconnect each.
Reassemble and run a full Normal programme while remaining present. Confirm the machine fills correctly, heats, washes, and drains without E04 appearing.
When to call an engineer
- Pressure switch shows OL in all states and produces no click when blown into — switch has failed
- NTC thermistor reads open circuit or zero — sensor has failed
- Pressure hose confirmed clear but E04 persists — switch or sensor needs replacing
- Wiring connector to either sensor is corroded and cannot be fully reseated
Frequently asked questions
Why does E04 cover both the pressure switch and the temperature sensor?
How do I work out which sensor has failed?
Can a blocked pressure hose cause E04 without the switch being faulty?
Is there an overfill risk with E04?
🎯 What is likely causing this fault?
⚠️ Estimates based on common faults — not a guaranteed diagnosis. Always verify before ordering parts.
Parts you may need
Enter your model number to filter results to your exact machine
Usually found on a label inside the door frame or on the back panel of the machine.
| Part | Approx. UK Cost | Find it |
|---|---|---|
| NTC Thermistor | £10 - £12 | 🛒 Amazon UK → |
| NTC Thermistor | £10 - £12 | 🏷️ eBay UK → |
ℹ️ Prices are approximate. Always check the part number matches your model before ordering. Not sure of your model number? Find out how to locate it here.