Installation and operating instructions Wilo E.../1-5 12
English
9 Maintenance
Only allow qualified specialist staff to perform maintenance
and repair work.
DANGER! Danger of electric shock!
Any danger from electrical current should be ruled out.
• The pump should be electrically isolated and secured against
unauthorised switch-on during any maintenance or repair
work.
• Any damage to the connection cable should always be recti-
fied by a qualified electrician only.
10 Faults, causes and remedies
Faults Causes Remedy
Pump is not running
although the cur-
rent entry is
switched on
Electrical fuse defective Check fuses.
Pump has no voltage Resolve the power
interruption
Pump is making
noises
Cavitation due to insuf-
ficient suction pressure
Increase the system
suction pressure within
the permissible range
Check the delivery head
and set it to a lower
height if necessary.
Building does not
get warm
Thermal output of the
heating surfaces is too
low
Increase setpoint
(see 8.2)
Set control mode to
Δp-c
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