White Knight E10 tumble dryer: what it means & what to check

Stop using it for now. Carrying on with this fault risks further damage or a leak. Switch it off at the wall until it has been looked at.

What E10 actually means

The machine can no longer trust its water level sensor, so it stops rather than risk filling or draining blind.

E10 on these White Knight washer-dryers is the electronic pressure sensor (EPS) fault. That sensor reports the water level in the drum as a frequency signal, and the control board expects it to sit in a narrow band — roughly 43.4Hz to 46.0Hz — when the pump has run and the drum is empty. If the reading is out of range, or no signal arrives at all, the board treats the level information as unreliable and halts. In the factory self-test it appears at the very first step, immediately after the pump is energised, and cancels the rest of the test outright.

What E10 looks like on a White Knight tumble dryer

Most people find this page having searched for what the machine is doing rather than the code itself. On a White Knight tumble dryer, E10 usually shows up as one or more of these:

Machine not draining
Water left in the drum at the end of the cycle
Stops mid-cycle full of water
Standing water in the bottom
Not filling with water
No water going in
Takes for ever to fill
Stops right at the start of the cycle

Recognise any of those? That is this fault, and the rest of this page explains what causes it and what you can check yourself.

What usually causes it

A faulty electronic pressure sensor
A loose or dislodged plug on the sensor's wiring connector
A blocked, split or trapped pressure chamber hose feeding the sensor
Water left sitting in the drum or sump so the sensor never sees an empty level
A control board fault misreading an otherwise healthy sensor

What you can safely check yourself

Work through these in order. Anything beyond this — panels off, testing parts, anything to do with the wiring — is an engineer's job, and not one to attempt with the machine plugged in.

Switch off at the wall for a minute and back on — an occasional one-off reading will clear
Clean the pump filter and make sure the machine has actually drained; standing water in the drum can leave the sensor reading a level that never falls
Check the drain hose is not kinked, squashed behind the machine or pushed too far down the standpipe

Which White Knight models show E10

E10 means the same thing on all 3 of these models. If yours is not listed, the explanation above still applies — the code is set by the control board, not the model number.

WK-AT75WDW · WK-AT7WM148W · WK-ATBIWM814W

Common questions about White Knight E10

What does E10 mean on a White Knight tumble dryer?

The machine can no longer trust its water level sensor, so it stops rather than risk filling or draining blind. E10 on these White Knight washer-dryers is the electronic pressure sensor (EPS) fault. That sensor reports the water level in the drum as a frequency signal, and the control board expects it to sit in a narrow band — roughly 43.4Hz to 46.0Hz — when the pump has run and the drum is empty. If the reading is out of range, or no signal arrives at all, the board treats the level information as unreliable and halts. In the factory self-test it appears at the very first step, immediately after the pump is energised, and cancels the rest of the test outright.

Can I fix White Knight E10 myself?

There are 3 checks you can safely do yourself first.

Switch off at the wall for a minute and back on — an occasional one-off reading will clear.
Clean the pump filter and make sure the machine has actually drained; standing water in the drum can leave the sensor reading a level that never falls.
Check the drain hose is not kinked, squashed behind the machine or pushed too far down the standpipe.

This one usually needs an engineer once you have tried them.

How much does it cost to repair White Knight E10?

£66 including VAT for an engineer to come out and diagnose it, or £84 in total including VAT if it is put right on the visit and no parts are needed. Any parts needed are quoted on site before we fit them — you decide. Every repair carries a 90-day workmanship guarantee.

Tried the checks and it's still showing E10?

This one usually needs an engineer once you have tried the checks above. Then it wants someone who can open it up.

What it costs, before you call: the price is the same whatever the fault turns out to be — £66 including VAT for an engineer to come out and diagnose it, or £84 in total including VAT if it is put right on the visit and no parts are needed. Any parts needed are quoted on site before we fit them — you decide. Every repair carries a 90-day workmanship guarantee.

Our own engineers, not a call centre. We cover Nottinghamshire, Derbyshire and Leicestershire — most tumble dryer faults are seen same day or next day.

Call 0115 648 0929 Book online — postcode and number is all we need

Outside our area? The explanation above still stands — take it to a local engineer and tell them the code. Knowing it saves them time and you money.

Other White Knight tumble dryer codes

All White Knight fault codes and repairs →

What this looks like when it happens

tumble dryer drum not turning

Repairs we cover near you

Written by the engineers at ASAP Repairs, 0115 648 0929. We repair these machines for a living in Nottinghamshire, Derbyshire and Leicestershire.

White Knight E10 error — tumble dryer