Smeg CWC620D Manual page 23

Err23 Boiler does not heat up as expected
Err24 Boiler temperature probe malfunction
Err25 Boiler water filling malfunction
Err26 Boiler emptying malfunction
Boiler emptying malfunction – with tank
Err27
full
Err28 Boiler heating malfunction (overheating)
‐ CW 620/630
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
The boiler does not fill within the allowed time:
check water intake tap, dynamic pressure in
intake system, cleaning of water intake filter,
possible damage to water intake hose
Or check in this order:
‐ boiler pressure switch has failed (continuous
empty reading)
‐ pipe leaking/disconnected (water entering pipe)
‐ check that rinsing spray arm nozzles are clean
‐ boiler pressure switch has failed (continuous full
reading)
‐ pipe leaking/disconnected (water entering pipe)
‐ rinsing pump not working
Boiler pressure switch has failed (continuous full
reading)
First check:
‐ boiler pressure switch has failed (continuous full
reading)
‐ pipe leaking/disconnected: water entering pipe
connected to air trap, pressure switch continues
to give full reading even with boiler empty,
heating element operating dry
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