Logik L814wm16

This thread was marked as solved. Here's a summary of the problem and the fix, generated from the discussion below.

Logik L814wm16 showing E21 despite pump running

The problem

Logik L814wm16 washing machine reports E21 drain pump error and continues trying to pump out even when the machine is empty. The filter, pump, sump hose, pressure bottle and hose were cleaned, and the pressure switch was replaced, but the fault remained. With the pump disconnected, E12 overfill error was shown.

Likely cause

The most strongly supported diagnosis is that the machine is not detecting that the water has pumped away because the pressure system is still blocked or restricted by gunge or limescale. The accepted reply says this is more likely than a faulty pressure switch.

What fixed it

Check and thoroughly clear the pressure system for blockage or restriction. The discussion indicates that replacing the pressure switch often has no effect and points instead to contamination in the pressure system. The exact repair carried out was not confirmed in the thread.

Checks to try

• Cleaned filter
• Removed and cleaned pump
• Removed and cleaned sump hose
• Removed and cleaned pressure bottle and hose
• Replaced water sensor/pressure switch
• Observed E12 overfill error when pump was disconnected

Parts or tools mentioned

• Pressure switch