5-17 Diagnostic
With this feature is possible to have a visual signal that a trouble is occurring
This mode is always active and the signalling is made through the display board LEDS
In case of no troubles the LEDS status follows its normal function
The detected troubles are showed to the user/technician using the 3 leds of the indoor unit receive
and the 5 leds on the outdoor pcb. For each fault there are different effects upon the operation of the A/C:
NOTES
The troubles are showed according to a priority list that is, in case of more than on
trouble present, is always showed, at first, the one with the highest priority (1 2 3 etc).
Sensor damaged means a situation where sensor is short-circuited or opened
In case of damaged sensors, the system (CM, FMO, FMI etc), if in OFF state, does not start
LD2(opr) LD3(timer) LD1(stby)
4 RAT probe damaged F O F
3 ICT probe damaged F F O
2 communication error F F F
1 fault on outdoor unit O O F
0 wrong mode selected ● FF
O = LED of
F = LED blinking
● = LED on
system does not operate.To restart the system,
select correct mode
EffectsPriority INDOOR UNIT FAULT
System does not operate. To restart the system,
power re-setting (off-on) is required
The A/C switches off. As soon as fault is
cleared the system automatically restart
LEDS status
18
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