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8. OUTDOOR UNIT INSTALLATION MANUAL
Engineering Data book
8
14TROUBLESHOOTING
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 Hydro unit.
Verifying current abnormal status
1. Check that DIP switch SW803 is set to OFF.
2. Jot down the states of LED800 to LED804. (Display mode 1)
3. Press SW800 for at least 1 second. The LED status changes to display mode 2.
4. Check the code whose display mode 1 equals the LED states jotted down and display mode 2 equals the current
flashing status of LED800 to LED804 from the following table to identify the cause.
Verifying an abnormal state in the past although the abnormal state no longer occurs
1. Set bit 1 of DIP switch SW803 to ON.
2. Jot down the states of LED800 to LED804. (Display mode 1)
3. Press SW800 for at least 1 second. The LED status changes to display mode 2.
4. Find an error whose display mode 1 equals the LED states jotted down and display mode 2 equals the current
flashing states of LED800 to LED804 from the following table to identify the error.
• An outside air temperature (TO) sensor error can be checked only while it occurs.
No. Cause
Display mode 1 Display mode 2
D800 D801 D802 D803 D804 D800 D801 D802 D803 D804
1Normal
2 Discharge (TD) sensor error
3 Heat exchanger (TE) sensor error
4 Heat exchanger (TL) sensor error
5 Outside air temperature (TO) sensor error
6
Suction (TS) sensor error
7 Heat sink (TH) sensor error
8 Outdoor temperature sensor (TE/TS) connection error
9 Outdoor EEPROM error
10 Compressor breakdown
11 Compressor lock
12 Current detection circuit error
13 Thermostat for compressor activated
14 Model data not set (on the service P.C. board)
15 MCU-MCU communication error
16 Discharge temperature error
17 Abnormal power (open phase detected or abnormal voltage)
18 Heat sink overheat
19 Gas leak detected
20 4-way valve reverse error
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