6. Fault Code and Display Information
Outdoor Unit Display Switch Information
The operating status of the outdoor unit and fault diagnosis can be made using both the display
selector switch (on the interface pcb) and the eight red light emitting diodes on the interface printed
circuit board.
a. Display switch set to position “0” shows communication around the system
n/a
LED 8
n/a
LED 7
Lit = Sending serial signal to inverter printed circuit board
LED 6
Lit = Receiving serial signal from inverter printed circuit board
LED 5
Lit = Sending serial signal to multi controller 2
LED 4
Lit = Receiving serial signal from multi controller 2
LED 3
Lit = Sending serial signal to multi controller 1
LED 2
Lit = Receiving serial signal from multi controller 1
LED 1
b. Display switch set to position “1” shows status of both compressors
O
O
O
O
122 Hz
SF
X
O
O
O
111 Hz
SE
O
X
O
O
103 Hz
SD
X
X
O
O
92 Hz
SC
O
O
X
O
84 Hz
SB
X
O
X
O
76 Hz
SA
O
X
X
O
69 Hz
S9
X
X
X
O
61 Hz
S8
O
O
O
X
53 Hz
S7
X
O
O
X
46 Hz
S6
O
X
O
X
42 Hz
S5
X
X
O
X
36 Hz
S4
O
O
X
X
30 Hz
S3
Speed Limiting
Due To Protection
Circuits i.e.
High TD or Low TS
DOL compressor
On On = Run
Off Off = Stop
X
X
X
X
0 Hz
S0
LED 8
LED 7
LED 6
LED 5
LED4
LED 3
LED 2
LED 1
Inverter Speed
O = Lit
X = Off
c. Display switch set to position “2” shows the status of the system
TOSHIBA
AUGUST 1997
Page 16
