14
EN
If you cannot manage to eliminate the fault yourself using the following table:
- Microwatt and Mi version Reset the remote control to its factory settings, see instructions remote control 11025983
- Turn off the power. Wait until the screens are unlit. Turn on the power.
- If the problem persists, read the product rating plate and contact our after-sales service.
Problem
Possible cause
Solution
Microwatt and Mi
version
The remote control screen
does not light up
PCB power fault
• Check all wiring.
• Check the fuse on PCB
Microwatt and Mi
version
A fault is displayed on the
remote control
• See instructions 11025983 (remote control)
The motor does not
start and the frequency
controller screen is unlit.
The circuit breaker on the switchboard detects an overload and
cuts the circuit.
Or power fault.
• Check the size of the circuit breaker.
• Check the system voltage and the controller wiring (inside and outside the unit)
Controller inoperative
• Identify and correct the fault that caused the controller to fail
• Change the controller
The motor does not
start and the frequency
controller screen is lit.
The controller is faulty and displays a fault code
• See below: §Controller fault codes
The controller does not receive the order to start the motor
• Check the controller output voltage.
• The order to start is given by the controller terminal block (the RUN button is disabled).
- Check the position of switches above the controller terminal block: NPN (and AVI depending
on version)
- Check the wiring between PCB and controller (depending on version)
Motor wiring fault
• Check the wiring between the controller and the motor terminal box
Motor is inoperative
• Identify and correct the fault that caused the motor to fail
• Change the motor
The fan does not run
normally
The fan unit will not start or starts then stops
• Check all wiring
• Check the motor: connect to a 400 V AC power supply
• Replace the defective part
The fan impeller rotates in the wrong direction
• Check the direction of rotation of the fan motor.
• Check the motor wiring: swap two phase wires (on versions with 3-phase AC motor and
power supply) on the motor wiring to make it rotate in the correct direction:
((see sticker on the impeller for verification))
The fan does not work at the specified operating set point
• Check that the impeller is not sticking
• Check that the pressure set point is correctly defined (see page 10 or remote control
instructions, depending on the version)
• Check the pressure sensor: compare the set point defined with a pressure measurement
made separately inside the casing and upstream of the impeller
• Check the pressure tap tube between the pressure sensor (outlet P2, depending on the
version) and inside the casing. Unblock it
• Check the motor
• The controller is under-dimensioned. Check the air ductwork for leaks or abnormal
pressure losses
Controller fault codes
- Analyse the fault code displayed on the controller and correct the problem :
- Reset the faults by pressing its STOP/RESET button.
- Cut the power supply
- Wait until all the screens go blank
- Turn the power back on
Controller fault code
Description
Solution
oc
ocA, ocd, ocn
Over-current
• Check the current absorbed by the motor.
• Check the motor cable and insulation (short-circuit or earthing).
Ov
OvA, Ovd, Ovn, Ovs
Over-voltage
• Check the system voltage.
Lv
LvA, Lvd, Lvn, Lvs
Under-voltage
• Check the system voltage.
• Check the motor load (friction, etc.)
• Check the power supply cable (no loss of phase).
oH1
Controller over-heating
• Check the current absorbed by the motor.
• Check the operation of the controller cooling fan.
• Check the ambient temperature of the controller.
oL
oL1, oL2, EoL1, EoL2
Overload (too much motor current)
• Check the motor load (friction, etc.).
Gff
Earthing (controller output)
• Check the motor cable and insulation.
PHL
orP
Loss of phase (controller input)
• Check the input voltages and phase balance.
oPHL
oPL1, oPL2, oPL3
Loss of phase (controller output)
• Check the output phase balance
• Change the motor
