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32 Wilo AG 03/2006
Table 1, Fault signals
If the problem cannot be rectified, contact your
sanitation and heating dealer or Wilo Customer
Service.
Subject to technical alterations
Code Alarmtext Causes Remedies
E20
FC Error Frequency converter signals failure Check failure display in menue 3.3.6
or on the FC-display, rectification
according to installation and opera-
tion manual of FC
Elektrical connection defective Check and, if required, maintain
electrical connections of FC
Motor protection of FC tripped (e.g.
short circuit of FC-mains; Overload
of pump)
Check and, if required, maintain
electrical supply line of FC (see
installation and operation manual of
pump)
E40
Sensor fault Pressure sensor defective Replace sensor
No electrical connection to sensor Maintain electrical connections
E42
Pre-pressure min Dry run protection tripped Check inlet and storage tank; Sys-
tem restarts automatically
E43
Output pressure Min The output pressure of the system
has fallen below the value set in
menu 3.3.2.3 (e.g. because of burst
pipe)
Check whether set value complies
with local conditions
Check and, if required, repair pipe-
work
E44
Output pressure min Output pressure of system below
value adjusted (e.g. caused by pipe
breakage) in menue 3.3.2.3
Check if adjustments meet require-
ments of local installation
Check and, if requested, maintain
pipework
E61
Pump1 Alarm Winding overtemperature (WSK/
PTC)
Clean cooling fins; Motors are
designed for ambient temperatures
up to +40°C (see installation and
operation manual of pump)
E62
Pump2 Alarm
E63
Pump3 Alarm
E64
Pump4 Alarm Motorprotection tripped (Overcur-
rent or short circuit in supply line)
Checking pump (see installation and
operation manual of pump) and
supply line connection
E65
Pump5 Alarm
E66
Pump6 Alarm
E88
E88Battery discharged The battery is discharged down to
minimal niveau, the further buffer-
ing of real time clock is any longer
assured
Replace battery (see chapter 9)
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