Spare Parts - Wilo -COF-2B Installation And Operating Instructions Manual

English
Fault
One pump does not start
No pressure on the discharge
side
Random operation, pumps
start frequently
In the case of the municipal
water supply version of the
pressure-boosting system,
the low-water safety acti-
vates frequently
Automated operation defec-
tive
Discharge valve not sealed
The pressure-boosting system
does not stop or does not start
The pumps do not stop
If the fault cannot be remedied, please consult
a specialist technician or your closest Wilo
customer service agent.
14
Cause
Thermal motor protection activated
Magnetic circuit breaker activated
Pump shaft blocked
Winding malfunction
At least one of the pumps is deacti-
vated
Municipal water supply pressure
below minimum prescribed pressure
One pump is obstructed by foreign
bodies
The motors are supplied by insuffi-
cient power supply voltage
Pressure sensor is defective
Insufficient system capacity
(or tank of insufficient capacity)
Tank pre-inflation level does not
conform
Water storage vessel pierced
Low water cut-out switch is set too
high
Municipal water supply pressure
drops when pumps activate.
Switchgear defective
Sensor defective
Wires disconnected
Flow switch defective
Valve diaphragm or gasket is destroyed Replace the valves.
Pressure sensor gate valve is closed
Check the flow switch
Remedy
The pump "malfunction" warning light on the switch-
gear must be illuminated. Check the thermal motor pro-
tection settings and reset.
Check that the motor phases have not short circuited.
Replace the motor if necessary.
Reset the circuit breaker.
Disconnect the switchgear power supply, then check
that the pump shaft turns freely. If it is blocked, proceed
to dismantle the pump.
Disconnect the terminal of the motor concerned and
check the resistor at the terminals and the stator's insu-
lation to earth.
Replace the motor if necessary.
See the preceding chapter, fault "At least one of the
two pumps does not start" and refer to the pump instal-
lation instructions.
Contact the local water supplier or replace the
pressure-boosting system. Contact us.
Dismantle and clean the pump.
Check the voltage and the connection to motor
terminals.
Check settings: if sensor is unstable, it must be replaced.
Install an additional storage tank or replace with a tank
that has greater capacity.
Proceed to inflate the tank.
Replace the vessel.
Adjust and correct the cut-out switch settings.
Adjust the low water cut-out switch to a minimum.
If the issue persists, the municipal water supply is insuf-
ficient; check the pressure gauge reading when the
pumps start up, or consult the municipal water supplier.
Consult the switchgear instructions.
Check the contacts, replace the sensor in question if
necessary.
Check all connections to the switchgear terminal
switch.
Check the activation and deactivation of the flow
switch. Replace if necessary.
Open the pressure sensor gate valve.
Ensure that the flow switch is installed in the
direction of fluid flow.

11 Spare parts

Spare parts may be ordered or repair work
arranged via a specialist retailer and/or Wilo cus-
tomer service.
To avoid queries and incorrect orders, all data on
the rating plate should be submitted with each
order.
WILO SE 07/2024