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If you cannot manage to eliminate the fault yourself using the following table:
- Microwatt and Microwatt+ 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
Microwatt and Microwatt+
version
PCB power fault
The remote control screen
does not light up
Microwatt and Microwatt+
version
A fault is displayed on the
remote control
The circuit breaker on the switchboard detects an overload and
cuts the circuit.
The motor does not
Or power fault.
start and the frequency
controller screen is unlit.
Controller inoperative
The controller is faulty and displays a fault code
The controller does not receive the order to start the motor
The motor does not
start and the frequency
controller screen is lit.
Motor wiring fault
Motor is inoperative
The fan unit will not start or starts then stops
The fan impeller rotates in the wrong direction
The fan does not run
normally
The fan does not work at the specified operating set point
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
Controller fault code
oc
Over-current
ocA, ocd, ocn
Ov
Over-voltage
OvA, Ovd, Ovn, Ovs
Lv
Under-voltage
LvA, Lvd, Lvn, Lvs
oH1
Controller over-heating
oL
Overload (too much motor current)
oL1, oL2, EoL1, EoL2
Gff
Earthing (controller output)
PHL
Loss of phase (controller input)
orP
oPHL
Loss of phase (controller output)
oPL1, oPL2, oPL3
Possible cause
Description
14
• Check all wiring.
• Check the fuse on PCB
• See instructions 11025983 (remote control)
• Check the size of the circuit breaker.
• Check the system voltage and the controller wiring (inside and outside the unit)
• Identify and correct the fault that caused the controller to fail
• Change the controller
• See below: §Controller fault codes
• 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)
• Check the wiring between the controller and the motor terminal box
• Identify and correct the fault that caused the motor to fail
• Change the motor
• Check all wiring
• Check the motor: connect to a 400 V AC power supply
• Replace the defective part
• 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))
• 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
- Wait until all the screens go blank
- Turn the power back on
• Check the current absorbed by the motor.
• Check the motor cable and insulation (short-circuit or earthing).
• Check the system voltage.
• Check the system voltage.
• Check the motor load (friction, etc.)
• Check the power supply cable (no loss of phase).
• Check the current absorbed by the motor.
• Check the operation of the controller cooling fan.
• Check the ambient temperature of the controller.
• Check the motor load (friction, etc.).
• Check the motor cable and insulation.
• Check the input voltages and phase balance.
• Check the output phase balance
• Change the motor
Solution
Solution
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