112
Troubleshooting
NOTE:
● Measure the insulation resistance of inverter compressor.
Do not perform the emergency operation when the insulation resistance is 0Ω
The other compressors may be damaged because there is a possibility that refrigerant oil is oxidized.
● In this emergency operation, compressor frequency cannot be controlled normally.
Therefore, alarm code “07”, “43”, “44”, “45” or “47” may display on LCD.
● This emergency operation may not provide sucient cooling and heating capacity.
● This operation is an emergency but a temporary operation when the inverter compressor is damaged.
Therefore, replace it with the new one as soon as possible.
● Turn OFF DSW5-No.1, No.2 of outdoor unit PCB after replacing the compressor.
If this setting is not performed, the inverter compressor will be damaged.
(2) Emergency Mode Operation from Outdoor Unit PCB for Compressor Failure
①
For Combination of Outdoor Units
This operation is an emergency operation by excluding the failed unit when the inverter compressor fails.
<Alarms Corresponding to Inverter Compressor Failure>
06: Abnormality of inverter voltage
23: Abnormality of discharge thermistor
48: Activation of over current protection device
51: Abnormality of inverter current sensor
53: Inverter error signal detection
54: Abnormality of inverter n temperature
<Procedure>
1. Turn OFF all the main switches of outdoor and indoor units.
2. Check the inverter PCB. If inverter PCB is faulty, disconnect the wiring (U, V, W) of diode module. (Insulate the
disconnected terminals.)
3. Turn DSW5-No.1 and No.2 ON to stop the compressor operation. If they are set, all the set compressors in the
failed outdoor unit will NOT operate.
For heat pump system, fully close the stop valves (for gas/liquid) of the failed outdoor unit.
Set control PCB of the failed outdoor unit.
4. Turn ON the power supply.
5. Start the operation by remote control switch.
Even if one unit fails, the others can keep operating.
TB2
(DSW5)
DSW5 Compressor
1 Inverter Compressor 1
2 Inverter Compressor 2
<Outdoor Unit PCB>
Failed Outdoor Unit
ON
11111 2
Compressor
Compressor
Compressor
x
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