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How to check the existing piping settings
You can check whether the existing piping settings are enabled.
1. Check that the LED displays are placed in their initial status. If not, place them in the initial status.
2. Hold down SW01 for at least 5 seconds, and check that D804 flashes slowly. (Fig. 9)
3. Press SW01 four times to set the LED displays (D800 to D805) to the “LED displays for existing piping settings”
shown below. If the setting is enabled, D802 lights and D804 and D805 flash rapidly. (Fig. 10)
4. Hold down SW01 and SW02 simultaneously for at least 5 seconds to return the LED displays to the initial status.
(Fig. 9)
(Fig. 10)
When restoring the factory defaults
To restore the factory defaults in situations such as when relocating the units, follow the steps below.
1. Check that the LED displays are placed in their initial status. If not, place them in the initial status.
2. Hold down SW01 for at least 5 seconds, and check that D804 flashes slowly. (Fig. 11)
3. Press SW01 20 times to set the LED displays (D800 to D805) to the “LED displays restored to factory defaults”
shown below. (Fig. 12)
(Fig. 11)
(Fig. 12)
4. Hold down SW02 for at least 5 seconds, and check that D804 flashes slowly. (Fig. 13)
5. Hold down SW01 and SW02 simultaneously for at least 5 seconds to return the LED displays to the initial status.
(Fig. 13)
LED displays indicated when step 3 is taken
D800
D801
D802
D803
D804
D805
:ON, :OFF, :Slow flashing
LED displays for existing piping settings
D800
D801
D802
D803
D804
D805
:ON, :OFF, :Rapid flashing
LED displays indicated when step 2 is taken
D800
D801
D802
D803
D804
D805
:ON, :OFF, :Slow flashing
LED displays restored to factory defaults
D800
D801
D802
D803
D804
D805
:ON, :OFF, :Rapid flashing
LED displays indicated when step 4 is taken
D800
D801
D802
D803
D804
D805
:ON, :OFF, :Slow flashing
14
Troubleshooting
You can perform fault diagnosis of the outdoor unit with the LEDs on the P.C. board of the outdoor unit in addition
to using the check codes displayed on the wired remote controller of the indoor unit.
Use the LEDs and check codes for various checks. Details of the check codes displayed on the wired remote
controller of the indoor unit are described in the Installation Manual of the indoor unit.
LED displays and check codes
···ON ···OFF ···Rapid flashing (5 times/sec)
No.
Trouble description
LED display
D800 D801 D802 D803 D804 D805
1
Normal
2
Discharge temp. sensor (TD) trouble
3
Heat exchanger temp. sensor (TE) trouble
4
Heat exchanger temp. sensor (TL) trouble
5
Outside air temp. sensor (TO) trouble
6
Suction temp. sensor (TS) trouble
7
Heat sink temp. sensor (TH) trouble
8
Miss-mounting of outdoor temp. sensor (TE, TS)
9
Low pressure sensor trouble
10 EEPROM trouble
11 Compressor break down
12 Compressor lock
13 Current detection circuit trouble
14 Case thermostat operation
15 Low pressure protective operation
16 Unset model type of P.C.board
17 MCU communication trouble
18 Discharge temp. trouble
19 High pressure SW operation
20 Power supply trouble
21 Heat sink overheat trouble
22 Gas leak detection
23 4-way valve inverse trouble
24 High pressure protective operation
25 Fan system trouble
26 Short-circuit of compressor drive element
27 Position detection circuit trouble
SW01 SW02
LED
(D800~D805)
141-EN
142-EN
