‐CW521/531
24
Err23 Boilerdoesnotheatupasexpected
The problem might occur because water is
continually entering the tank (the causes are as for
Err5–seeabove)
Ifitpersists,checkinthisorder:
‐damagedboilerheatingelement
‐contactorfailure,
‐boilersafetythermostatfailure,
‐ boiler temperature probe faulty or incorrectly
positioned
‐motherboardrelayfailure,
Important:if the boiler heating elementis damaged,
this might be due to operation with no water in the
boiler‐thepressureswitchisindicatingfullevenwith
the boiler empty: check and ifnecessary replace the
boiler air trap and/or the relative pressure switch:
the problem is generally preceded by “boiler
overheatingE28”
Err24 Boilertemperatureprobemalfunction
boiler temperature probe disconnected or not
working
Err25 Boilerwaterfillingmalfunction
Theboilerdoesnotfillwithintheallowedtime:check
waterintaketap,dynamicpressure inintakesystem,
cleaning of water intake filter, possible damage to
waterintakehose
Orcheckinthisorder:
‐boilerpressureswitchhasfailed(continuousempty
reading)
‐pipeleaking/disconnected(waterenteringpipe)
Err26 Boileremptyingmalfunction
‐checkthatrinsingsprayarmnozzlesareclean
‐ boiler pressure switch has failed (continuous full
reading)
‐pipeleaking/disconnected(waterenteringpipe)
‐rinsingpumpnotworking
Err27
Boiler emptying malfunction – with
tankfull
Boiler pressure switch has failed (continuous full
reading)
Err28
Boiler heating malfunction
(overheating)
Firstcheck:
‐ 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
elementoperatingdry
Or:
‐circuitboardrelayfailure,or
‐contactorfailure
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