Service manual

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11-5. Trouble Diagnosis by Outdoor LED
For the outdoor unit, the self-diagnosis is possible by
LED (Yel) and four LEDs (Red).
• LED (Yel) (D800) and LEDs (Red) (D801 to D804) are
provided on the sub-control board under surface of the
inverter, and as shown below, they are checked from
the wiring port when removing the wiring cover.
1. If a trouble occurs, LED (Red or Yel) goes on accord-
ing to the trouble as described in the table below.
2. When two or more troubles occur, LEDs go on cycli-
cally.
3. Usually, LEDs (Red or Yel) go off.
Yellow
Red
D800D801D802D803D804
LED
Fig. 11-5-1
¡ : LED ON,
l
: LED OFF
IGBT : Insulated Gate Bipolar Transistor, P.M.V. : Pulse Motor Valve
*2
*2
*2
*1
*1
LED display
D800 D801 D802 D803 D804
lllll
l
¡
lll
¡¡
lll
ll
¡
ll
¡
l
¡
ll
l
¡¡
ll
¡¡¡
ll
lll
¡
l
¡
ll
¡
l
l
¡
l
¡
l
¡¡
l
¡
l
¡¡¡¡
l
¡
lll
¡
¡¡
ll
¡
l
¡¡
l
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l
¡
lll
¡¡
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Indoor
check code
—
14
16
17
1C
19
1A
1B
1D
1E
1F
1C
1C
1C
1C
1C
1C
1C
Description
During normal operation
IGBT short circuit, compressor motor rare short
Position-detect circuit error
Current-detect circuit error
Compressor system error
Discharge temp. sensor (TD) error
Outdoor fan error
Outside temp. sensor (TO) error
Compressor lock
Discharge temp. sensor error, gas leakage
Compressor break down
A room gas side temp. sensor (TGa) error
B room gas side temp. sensor (TGb) error
C room gas side temp. sensor (TGc) error
Gas leakage, P.M.V. sensor error
Indoor heat exchanger sensor (TC) disconnection,
P.M.V. sensor error
Indoor/outdoor miswiring, gas leakage, TC sensor
disconnection, P.M.V. sensor error
Communication error between MCU
*1 : Back-up operation is performed without block display of the indoor unit.
*2 : Operated normally when the air conditioners in other rooms are driven.