Smeg CWH520D Manual page 23

Err25 Boiler water filling malfunction
Err26 Boiler emptying malfunction
Boiler emptying malfunction – with
Err27
tank full
Boiler heating
Err28
(overheating)
‐ CWH 520
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
malfunction connected to air trap, pressure switch continues to
give full reading even with boiler empty, heating
element operating dry
Or:
‐ circuit board relay failure, or
‐ contactor failure
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