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7. FUNCTION
7-1 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 (5) leds of the indoor unit receiver
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 one trouble present,
is always showed, at first, the one with the highest priority (3
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.
Priority
INDOOR UNIT FAULT
4
RAT probe damaged
3
ICT probe damaged
2
communication error
1
fault on outdoor unit
0
wrong mode selected
Priority OUTDOOR UNIT FAULT
17
wrong connection pipes
16
NTT C probe damaged
15
WTT C probe damaged
14
NTT B probe damaged
13
WTT B probe damaged
12
NTT A probe damaged
11
WTT A probe damaged
10
CDT probe damaged
9
OAT probe damaged
8
OCT probe damaged
7
compress. overcurrent
6
compressor overtemp.
5
fan overcurrent
4
fan overtemperature
3
PFC fault
2
fault on indoor units
1
indoor units
communication error
O = LED off
F = LED blinking
●
= LED off
LEDS status
LD1 tmr LD2 opr LD3 stby LD4 opr LD5 tmr
O
F
F
F
F
O
F
F
F
O
O
F
●
F
F
LEDS status
DL5
DL4
DL3
O
F
F
O
O
F
O
O
F
O
O
F
O
O
F
O
O
F
O
O
O
O
O
F
O
O
F
O
O
F
O
O
O
O
O
F
O
F
F
O
F
F
O
O
F
O
F
F
F
F
F
16
2
1 etc).
F
O
system does not operate.
F
F
as soon as fault is cleared, the system
automatically restart after 3 min
F
F
during this time, the signalling is showed
O
O
●
O
system does not operate.
to restart the system, select correct mode
DL2
DL1
O
system does not operate.
F
To restart the system,
power re-setting (off-on) is required
note: before restoring power, adjust
the dip-switch status on indoor unit
according to the connection pipes
F
F
F
F
F
F
O
F
O
F
O
system does not operate.
F
O
O
as soon as fault is cleared, the system
automatically restart after 3 min
O
O
O
O
during this time, the signalling is showed
F
F
O
F
O
O
O
O
F
F
O
F
O
O
EFFECTS
EFFECTS
- Quick Links:
- Unit Specifications
- Diagnostic
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