Smeg CWH520D Manual page 22

Water pump‐out malfunction
Err06
Err09 Too much water in tank
Err23 Boiler does not heat up as expected
Err24 Boiler temperature probe malfunction
water intake hose or cleaning of rinsing nozzles.
If the problem persists during FILL:
‐ tank pressure switch has failed (continuous empty
reading: check whether tank safety pressure switch
is tripped)
‐ leak from pipe connected to air trap
If the problem occurs during work cycle
‐ filler hose bleeder valve fouled: tank empties
completely at end of a wash cycle due to siphon
effect.
Inspect the filters for dirt and check that the drain
hose is not blocked, bent or crushed.
Check that the drain pump is not blocked by dirt by
removing the insert on the sump (from inside the
tank).
If it persists, check in this order:
‐ with tank empty: constant "tank full" signal: tank
pressure switch faulty or leak from connections of air
trap connection pipe (water entering pipe)
‐ with tank full: drain pump failure
With tank full:
see above (water pump‐out malfunction)
With tank empty: constant "tank full" signal: safety
pressure switch faulty or leak from connections of air
trap connection pipe (water entering pipe)
The problem might occur because water is
continually entering the tank (the causes are as for
Err5 – see above)
If it persists, check in this order:
‐ damaged boiler heating element
‐ contactor failure,
‐ boiler safety thermostat failure,
‐ boiler temperature probe faulty or incorrectly
positioned
‐ motherboard relay failure,
Important: if the boiler heating element is damaged,
this might be due to operation with no water in the
boiler ‐ the pressure switch is indicating full even with
the boiler empty: check and if necessary replace the
boiler air trap and/or the relative pressure switch:
the problem is generally preceded by "boiler
overheating E28"
boiler temperature probe disconnected or not
working
‐ CWH 520
22