Wilo Para Notice De Montage Et De Mise En Service page 45

Faults
Pump is not
running
although the
power supply is
switched on
Noisy pump
Building does
not warm up
Installation and operating instructions Wilo-Para
10 Faults, causes and remedies
The troubleshooting must only be carried out by a qual-
ified specialist, and work on the electrical connection
must only be carried out by a qualified electrician.
Causes
Electrical fuse
defective
No voltage supply
at pump
Cavitation due to
insufficient suction
pressure
Thermal output of
the heating surfaces
is too low
Remedy
Check fuses
Rectify the power interruption
Increase the system pressure within
the permissible range
Check the delivery head and set it to
a lower head if necessary
Increase setpoint
Set control mode to Δp-c instead of
Δp-v
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