Alarm reset: turn off and on the unit..
Before resetting an alarm identify and remove
its cause.
Repeated resets can cause irreversible damage
Before carrying out any work, read the
warnings in the Maintenance chapter
Master unit
If there is a power failure to the Master unit, all
the units in the group stops.
The unit is in protection in the following
conditions
1 High pressure or protection due to drain
temperature
2 low voltage
3 compressor current protection
4 frequency protection of the inverter
compressor
5 condenser high temperature
6 high temperature difference between the
entering water and the leaving water
7 antifreeze protection
8 drain temperature sensor malfunction
9 low evaporator temperature
10 frequency protection by voltage
11 compressor inverter malfunction
12 fan motor protection
13 water return high temperature, in cooling
14 low pressure antifreeze protection
15 High temperature of inverter compressor
module
When the unit fails or is in protection, the water
pump continues working (except for water flow
alarm, voltage protection, phase sequence
protection).
When the master unit is in protection, only the
master unit stops and the other units carry on
working.
When a slave unit is in protection, this unit stops
and the other units are not involved .
If the master unit fails, the slave units also stop
working.
Temperature sensors
All of the temperature sensors are classed as
faulty when the voltage on the corresponding
input is lower than 0.05 V or higher than 4.95 V.
After an error has been signalled, all units stop.
The error is eliminated after the sensor has been
restored.
9 TROUBLESHOOTING
Error
code
Description
troubleshooting
1E0
EEPROM error - main board
2E0
EEPROM error - inverter A module
3E0
EEPROM error - inverter B module
E1
phases sequence - control from main board
The three phases must be present at the same time and
offset by 120°
Restoring the power supply clears the error.
Note: the power supply is checked only in the initial
switch-on phase. It is not controlled when the unit is in
operation.
E2
communication error between main board and
keypad
If an error occurs between the wired controller and the
master unit module, all of the slave units stop.
If an error occurs in a slave unit (between the master
unit and a slave unit), the slave module with the
transmission error stops. The number of controlled units
on the wired controller is reduced, the wired controller
displays EC and the wired controller indicator flashes.
The error is eliminated after the transmission has been
restored.
If an error occurs between slave units, both units stop.
The master unit and the previous slave units are not
involved.
