Faults, Causes And Remedies - Wilo Yonos PARA High Flow Série Notice De Montage Et De Mise En Service

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The motor does not have to be completely removed from the pump housing if only the
control module is to be repositioned. The motor can be turned to the desired position while
still attached to the pump housing (see permissible installation positions as per fig. 2).
NOTE: Generally, turn the motor head before the system is filled.
CAUTION! Risk of damage to property!
If, for maintenance or repair work, the motor head is detached from the pump housing,
the O-ring located between the motor head and pump housing must be replaced with
a new one. When installing the motor head, check that the O-ring is correctly seated.
• To disconnect the motor, unscrew the 4 internal hexagon screws (fig. 6, item 1).
CAUTION! Risk of damage to property!
Do not damage the O-ring located between the motor head and the pump housing.
The O-ring must lie, untwisted, in the bearing plate chamfer facing the impeller.
• After installation, retighten the 4 internal hexagon screws crosswise.
• For the commissioning of the pump, see chapter 8.

10 Faults, causes and remedies

Faults, causes and remedies tables 10, 10.1, 10.2.
Only have faults remedied by qualified personnel. Follow the safety instructions in
chapter 9 .
Faults
Pump is not running
although the power
supply is switched on.
Black display
Pump is making noises. Cavitation due to insufficient
Building does not get
warm.
Table 10: Faults with external interference sources
38
Causes
Electrical fuse defective.
Pump has no voltage.
suction pressure.
Thermal output of the heating
surfaces is too low.
Remedy
Check fuses.
Restore power after interruption.
Increase the system suction pressure
within the permissible range.
Check the delivery head setting and set
to lower head if necessary.
Increase setpoint (see 8.2.1).
Set control mode to Δp-c.
WILO SE 01/2018