Dishwasher
E17
The E17 error code on a Siemens dishwasher indicates that water pressure or flow into the machine is too high, and it’s a relatively common fault that’s often fixable without a call-out. Left unresolved, it will stop your dishwasher from completing a cycle.
What does this error mean?
Siemens uses the E17 code to signal that the water inlet pressure exceeds the appliance’s safe operating threshold — typically above 1 MPa (10 bar). The dishwasher’s pressure sensor or flow meter has detected an abnormal surge and halted the programme to prevent internal damage. This is a protective fault, not a sign of a broken machine, and the root cause is usually external to the appliance itself.
Est. repair cost
£80–£150 professional repair; £20–£45 DIY inlet valve replacement; £10–£20 PRV adjustment by a plumber if high mains pressure is the cause
🔍 Likely causes
🛠️ Step-by-step fix
Reset the dishwasher: switch it off at the mains socket, wait 10 minutes, then switch back on and run a short cycle. A one-off pressure spike will often clear itself after a reset.
Check your mains water pressure: use a cheap pressure gauge (£10–£15 from any DIY store) on an outside tap. Ideal range for a dishwasher is 1–5 bar. If it reads above 8 bar, you need a plumber to fit or adjust a pressure-reducing valve (PRV) — this is the most common root cause of E17.
Inspect the inlet hose: turn off the water supply tap under the sink, disconnect the hose from the back of the dishwasher and from the tap, and check for kinks, cracks, or blockages. Straighten or replace the hose (£10–£20) if damaged.
Clean the inlet valve filter: with the water supply off, unscrew the inlet hose at the dishwasher end and pull out the small mesh filter inside the valve connection. Rinse it under the tap and remove any limescale or grit with an old toothbrush. Refit and test.
Test the inlet valve: if cleaning the filter doesn’t help, the inlet valve itself may be faulty — it can stick open or fail to regulate properly. Replacement valves for Siemens dishwashers cost £20–£45 online (search your model number + ‘inlet valve’). Swapping the valve is a straightforward job: isolate the water, disconnect two hose connections, unplug the electrical connector, and swap the part. If you’re not comfortable disconnecting electrical connectors, call a professional.
If the error persists after all the above, the internal pressure sensor or flow meter is likely faulty — this requires a professional diagnosis and replacement.
📞 When to call a professional
Call a qualified appliance engineer if your mains pressure is normal, you’ve cleaned the inlet filter, and the E17 code keeps returning after a reset — this points to a faulty internal sensor or inlet valve that needs testing with a multimeter. When you call, tell the engineer the exact error code (E17), your dishwasher model number (printed inside the door on a silver sticker), and what steps you’ve already tried.
⚖️ Repair or replace?
A professional repair for an E17 fault — typically an inlet valve or pressure sensor replacement — will cost £80–£150 including parts and labour in the UK. If your Siemens dishwasher is under 7 years old, repair is almost always worthwhile; Siemens machines are mid-to-premium quality and built to last 10–15 years. If it’s over 10 years old and has had previous faults, a new dishwasher (from £350 for a comparable Siemens model) may offer better long-term value.