– 90 –
10-6. 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
according to the trouble as described in the table
below.
2. When two or more troubles occur, LEDs go on
cyclically.
3. Usually, LEDs (Red or Yel) go off.
Fig. 10-6-1
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: LED ON,
l
: LED OFF
IGBT : Insulated Gate Bipolar Transistor, P.M.V. : Pulse Modulating Valve
LED display
D800
D801
D802
D803
D804
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Indoor
check code
—
14
16
17
1C
19
1A
1B
1D
1E
1F
18
18
1C
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
Suction temp. sensor (TS) error
Evaporator temp. sensor (TE) error
A room gas side temp. sensor (TGa) error
B room gas side temp. sensor (TGb) error
C room gas side temp. sensor (TGc) error
D room gas side temp. sensor (TGd) 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
Red
Yellow
D800 D801 D802 D803 D804
LED
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4
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4
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2
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2
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2
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2,
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3
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1
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1
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1 : Back-up operation is performed without block display of the indoor unit.
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2 : Operated normally when the air conditioners in other rooms are driven.
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3 : 4 units Multi model only
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4 : Heat pump model only