Toshiba MAR - M81HTM8 - E Service Manual page 16

TOSHIBA
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
LED 1
LED 2
LED 3
LED 4
LED 5
LED 6
LED 7
LED 8
b. Display switch set to position "1" shows status of both compressors
Inverter Speed LED 1
S0 0 Hz
S3 30 Hz
S4 36 Hz
S5 42 Hz
S6 46 Hz
S7 53 Hz
S8 61 Hz
S9 69 Hz
SA 76 Hz
SB 84 Hz
SC 92 Hz
SD 103 Hz
SE 111 Hz
SF 122 Hz
O = Lit
c. Display switch set to position "2" shows the status of the system
AUGUST 1997
6. Fault Code and Display Information
Lit = Receiving serial signal from multi controller 1
Lit = Sending serial signal to multi controller 1
Lit = Receiving serial signal from multi controller 2
Lit = Sending serial signal to multi controller 2
Lit = Receiving serial signal from inverter printed circuit board
Lit = Sending serial signal to inverter printed circuit board
n/a
n/a
LED 2 LED 3
X X X
X X O
X O X
X O X
X O O
X O O
O X X
O X X
O X O
O X O
O O X
O O X
O O O
O O O
X = Off
LED4 LED 5
X DOL compressor
O On On = Run
Off Off = Stop
X
O
X
O
X
O
X
O
X
O
X
O
Page 16
LED 6 LED 7 LED 8
Speed Limiting
Due To Protection
Circuits i.e.
High TD or Low TS