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Cod. 1910000001165 - nv01
English
10.4.1
Alarm table
ALARM TABLE
Protection/
Malfunction
Code
Error
LED flashing
sequence
Possible cause
Corrective actions
Stand-by
Off
Normal running
On
Lower water temperature T2
probe fault
PP1
●
(1blink 1 off)
1) Sensor circuit open
2) sensor short-circuit
1) check sensor connections
2) Replace sensor
Upper water temperature T3
probe fault
PP2
●
(2 blinks 1 off)
1) Sensor circuit open
2) sensor short-circuit
1) check sensor connections
2) Replace sensor
Evaporator
temperature
sensor fault
PP3
●
(3 blinks 1 off)
1) Sensor circuit open
2) sensor short-circuit
1) check sensor connections
2) Replace sensor
Air return temperature
sensor fault
PP4
●
(4 blinks 1 off)
1) Sensor circuit open
2) sensor short-circuit
1) check sensor connections
2) Replace sensor
Ambient
temperature
sensor fault
PP5
●
(5 blinks 1 off)
1) Sensor circuit open
2) sensor short-circuit
1) check sensor connections
2) Replace sensor
High pressure switch (HP
Switch)
EE1
●
(6 blinks 1 off)
1) Too high inlet air temperature
2) Insufficient water in the tank
3) Electronic expansion valve is
blocked
4) Too much refrigerant
5) Damaged switch
6) Uncompressed gas in the
refrigerant circuit
1) Check if the inlet air temperature is
beyond limit
2) Check if the tank is full, otherwise fill
it
3) Replace electronic expansion valve
4) Drain part of the refrigerant
5) Replace switch
6) Drain the refrigerant and load it
again
Low pressure switch (LP
Switch)
EE2
●
(7 blinks 1 off)
1) Too low inlet air temperature
2) Electronic expansion valve is
blocked
3) Insufficient refrigerant
4) Damaged switch
5) The fan assembly does not work
1) Check if the inlet air temperature is
below limit
2) Replace electronic expansion valve
3) Load refrigerant
4) Replace switch
5) Check if the fan rotates during the
compressor operation, if not replace
the fan assembly.
Overheating
protection
(HTP Switch)
EE3
●
(8 blinks 1 off)
1) Too high tank water temperature
2) Damaged switch
1) if the tank water temperature is >
85°C, the switch stops the unit to
protect it. The unit restarts when
normal conditions are restored
(upper T probe < 60°C).
2) Replace switch
Defrosting
Defro sting
indicated
…
(continuous flashing)
Communication error
EE8
on
11 . Standard Maintenance
11.1
Warnings
Warning: before starting any maintenance operation make sure that the machine is not or cannot accidentally be electrically
powered. It is therefore necessary to disconnect the power supply at each maintenance.