Installation and operating instructions Wilo-Para 49
en
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.
Faults Causes Remedy
Pump is not
running
although the
power supply is
switched on
Electrical fuse
defective
Check fuses
No voltage supply
at pump
Rectify the power interruption
Noisy pump
Cavitation due to
insufficient suction
pressure
Increase the system pressure within
the permissible range
Check the delivery head and set it to
a lower head if necessary
Building does
not warm up
Thermal output of
the heating surfaces
is too low
Increase setpoint
Change the control mode from Δp-c
to Δp-v
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