38
COMMISSIONING AND MAINtENANCE
led 1
Description
Remarks
15
Communication error between outdoor and indoor unit
The alarm activates 4 minutes after the unit start
The unit resets after problem resolution
16
Lack of refrigerant
The alarm activates 5 minutes after the unit start
After 2 consecutive interventions in 20 minutes, the unit resets after problem resolution
17
4-way valve malfunction
The alarm activates 5 minutes after the unit start
The alarm activates when, in Heating mode, the temperature detected by the indoor unit heat
exchanger probe is less than or equal to 15°C for 1 minute and for 3 times in an hour
18
Deviate from the normal for the compressor
The unit resets after problem resolution
19
Power module malfunction
After 3 consecutive interventions in 10 minutes, the unit resets after problem resolution
25
Overcurrent protection for single- phase of the compressor
The unit resets after problem resolution
In the presence of operating abnormalities, the unit is secured
and blocked.
9
Safety block can occur randomly.
9
Wait for at least 10 minutes before restarting the unit.
9
Check with a tester that the voltage between the power
supply connectors of the main electronic board is lower
than 10 Vdc.
9
If the fault occurs again, an accurate check of the device
components is required. Contact
R
Technical Support
Service.
9
Indoor units with display signal faults with an alphanumeric
code. Consult the matching outdoor unit instruction booklet
for the installer.
9
Model 1100 - 1125 - 1140
Faults are indicated by a flashing code displayed on the display
located on electronic circuit board:
1
Display
1
utdoor unit
display
Malfunction description
Malfunction diagnosis
Remarks
1
Microprocessor damaged
Microprocessor fault
Not restorable
Incorrect data
Electrical circuits damaged
2
Power module (PIM) overload
Over-current detected at the power module
Not restorable
3
Compressor overload during slow-down cycle
Over-current detected during compressor slow-down cycle
Not restorable
4
Communication error between main the board and the
compressor control module
The main board cannot communicate with the compressor
control module for more than 4 minutes
Restorable
5
Compressor overload detected by the main board
Compressor over-current detected by the main board
Not restorable
6
Voltage at the compressor control module (DC or AC) too high
AC: Compressor control module voltage detected over 280VAC
Restorable
DC: Compressor control module DC-bUS detected voltage over 390
VDC
8
Compressor discharge temperature too high
Detected discharge temperature over 115 °C
Automatic restore after 3
minutes if the temperature
drops below 115 °C
Not restorable if the alarm
occurs 3 times in 1 hour
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