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22
7 ALARM DIAGNOSTICS
When an alarm occurs the compressor stops and the display
shows an alarm code.
The alarm can be automatically reset in 3 minutes (if conditions
are normal) or by turning the unit off and on again (from the ON /
OFF power button).
On the main display there are two LEDs that indicate the same
alarm shown on the display
.
LED
DISPLAY
7.1
Alarms display board
7.1.1
outdoor
part alarms
DESCRIPTION
DISPLAY
Failure of the
outdoor
air temperature sensor
1
outdoor
coil
temperature sensor fault (Tehx)
2
Failure of the
supply air
temperature
sensor
compressor
3
Compressor current protection
4
IPM - IDU communication error
5
Power overcurrent
6
Compressor not detected
7
DC overvoltage
8
Failure
9
outdoor
coil
temperature too high (HTE)
10
IPM protection
11
EEPROM error
12
Compressor discharge temperature too high
13
7.1.2
Indoor
part alarms
DESCRIPTION
DISPLAY
Indoor
air temperature sensor
failure
(T.room)
14
Indoor
coil
temperature sensor
failure
(Tihx)
15
Indoor
coil
temperature too low (LT)
16
Indoor
coil
temperature too high (HTI)
17
IPM - IDU card communication alarm
5
AC Zero crossing (
not present)
18
Indoor
fan motor failure
19
High water level
20
EEPROM - read error
21
7.2
LED alarm codes
7.2.1 IPM board alarms
The following table indicates the number of flashes of the yellow
LED and of the red LED
.
Example
:
EEPROM - writing error
YELLOW LED: 4 consecutive flashes
RED: 1 flash
The flashing sequence is repeated until the alarm is present
.
DESCRIPTION
FLASHING
Yellow Red
Air temperature sensor failure
outdoor
1
0
outdoor
coil
temperature probe fault
(Tehx)
2
0
Failure of the
supply air
temperature
sensor
compressor
3
0
Compressor protection
4
0
IPM - IDU communication error
5
0
Supply overcurrent
6
0
Compressor not detected
7
0
DC overvoltage
8
0
Current failure
9
0
outdoor
coil
temperature too high (HTE)
0
1
Defrost ON
1
1
IPM protection
2
1
EEPROM - reading error
3
1
EEPROM - writ
ing
error
4
1
T
Compressor discharge temperature too high
7
1
7.2.2 Compressor frequency restrictions
The table shows the Compressor Frequency restrictions
DESCRIPTION
MODE
RESULT
N. Yellow
FLASHES
outdoor
coil
temperature too
high
Cooling
Limitation of the
frequency of the
compressor
3
outdoor
coil
temperature too
low
Cooling
The
outdoor
fan
turns off
3
Indoor
coil
temperature too
high
Heating
Compressor
frequency
limitation
3
Indoor
coil
temperature too
low
Cooling
Compressor
frequency
limitation
6
Power overcurrent
Coolin
g or
Heating
Compressor
frequency
limitation
4
Compressor outlet
temperature too
high
Cooling
or
Heating
Compressor
frequency
limitation
5
Compressor phase
overcurrent
Cooling
or
Heating
Compressor
frequency
limitation
10