Siemens E21 dishwasher: 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 E21 actually means

The main wash pump that pushes water up to the spray arms is jammed or can't move water properly, so the machine has halted rather than run a wash with no spray.

The circulation pump is the motor that drives water round the machine and up through the spray arms. On Siemens dishwashers, E21 is raised when the control board sees that pump obstructed — something is trapped between the motor and the pump housing, or debris is restricting the flow of water. Rather than keep driving a blocked pump, the machine stops the cycle.

What E21 looks like on a Siemens dishwasher

Most people find this page having searched for what the machine is doing rather than the code itself. On a Siemens dishwasher, E21 usually shows up as one or more of these:

Dishwasher door won't open
Door won't lock or click shut
Door lock light flashing
Door stuck shut with the load inside
Won't start even with the door closed
Dishwasher not draining
Water left in the tub at the end of the cycle
Stops mid-cycle full of water

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

Broken glass, fruit stones, olive pits or similar caught in the pump
A clogged or badly fitted mesh filter letting debris straight through to the pump
Food and grease build-up restricting water flow around the sump
Foreign objects such as cocktail sticks or bits of packaging drawn in
A worn or seized circulation pump motor

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.

Take out the bottom basket, lift out the filter assembly and wash it thoroughly under a hot tap — including the fine mesh, not only the coarse cup
Look into the empty sump for anything obvious sitting on the surface, such as glass fragments or a stone, and lift it out by hand (carefully, in case of sharp edges)
Refit the filter properly — it should twist and lock, not sit loose
Check the spray arms spin freely and their holes aren't blocked
Switch off at the wall for a minute, then power up and run a short programme to see if the code returns

Common questions about Siemens E21

What does E21 mean on a Siemens dishwasher?

The main wash pump that pushes water up to the spray arms is jammed or can't move water properly, so the machine has halted rather than run a wash with no spray. The circulation pump is the motor that drives water round the machine and up through the spray arms. On Siemens dishwashers, E21 is raised when the control board sees that pump obstructed — something is trapped between the motor and the pump housing, or debris is restricting the flow of water. Rather than keep driving a blocked pump, the machine stops the cycle.

Can I fix Siemens E21 myself?

There are 5 checks you can safely do yourself first.

Take out the bottom basket, lift out the filter assembly and wash it thoroughly under a hot tap — including the fine mesh, not only the coarse cup.
Look into the empty sump for anything obvious sitting on the surface, such as glass fragments or a stone, and lift it out by hand (carefully, in case of sharp edges).
Refit the filter properly — it should twist and lock, not sit loose.
Check the spray arms spin freely and their holes aren't blocked.
Switch off at the wall for a minute, then power up and run a short programme to see if the code returns.

This sometimes clears with those checks. If it comes back, it needs looking at properly.

How much does it cost to repair Siemens E21?

£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 E21?

This sometimes clears with the checks above. If it comes back, it needs looking at properly. 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 dishwasher 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 Siemens dishwasher codes

All Siemens fault codes and repairs →

What this looks like when it happens

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.

Siemens E21 error — dishwasher