Faults, Causes And Remedies - Wilo Yonos MAXO-D Installation And Operating Instructions Manual

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In assembled condition, the rotor's magnetic field is guided in the motor's iron core. There
is therefore no harmful magnetic field outside the machine.
DANGER! Risk of fatal electrical shock!
Even without the module (without electrical connection), there may be dangerous
contact voltage at the motor contacts.
It is not permissible to dismantle the module!
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.
2a and fig. 2b).
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
18
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 03/2015