Bosch Washer E27 Error — Door Lock Mechanism Fix

What it means

Bosch washer E27 error means a door lock fault — Bosch's specific 'Door lock error' code.
The door switch can see the door is shut, but the electric interlock isn't engaging the lock — usually a failing interlock solenoid that was working but is now intermittent.

Affected Models

Bosch Serie 2 / Serie 4 / Serie 6 / Serie 8 washing machines
Bosch Logixx, Maxx, Classixx ranges (older naming)
Bosch WAW, WAT, WAY, WAQ model series
Bosch Varioperfect washers
Same codes appear on Siemens and Neff washers (shared platform)

Common Causes

Door interlock (lock solenoid) failing
Latch hook on the door bent or worn
Wiring loose between interlock and main control board
Control board not sending the lock signal correctly
Door switch sensor faulty

How to Fix It

Power-cycle the washer.

Unplug for 60 seconds, plug back in.
If E27 was a one-off interlock glitch, a clean reboot may clear it.
If it returns on the next cycle, the interlock is failing.
Inspect the latch hook.

Look at the small metal hook on the door that pushes into the lock.
If bent or worn at the tip, it can't fully engage the interlock.
Replacement door panels (or just the hook on some models) are an option.
Listen during cycle start.

Start a cycle and listen at the door area.
You should hear a soft click as the interlock engages.
Silence means the interlock isn't getting power; a click followed by E27 means it's clicking but not holding.
Replace the door interlock.

If the interlock is failing, the part is inexpensive and a technician swap takes about 30 minutes.
Order the matching part for your Bosch washer model from Bosch parts or an independent reseller.

When to Call a Professional

E27 almost always means the door interlock needs replacement.
Part is inexpensive (£20–£35) and a 30-minute job for a technician — or a careful DIYer with the right driver and patience.

Frequently Asked Questions

What is the difference between Bosch E16 and E27?

E16 is 'Door not closed' — the door switch hasn't even seen close.
E27 is 'Door lock error' — the door is closed but the lock won't engage.
The diagnostic split: E16 you fix by closing the door properly or fixing the latch; E27 you fix by replacing the interlock that's not locking.
If you see both codes alternating, the interlock is failing intermittently — sometimes engaging (gives E16 if you don't close fully), sometimes not engaging at all (gives E27).