TROUBLESHOOTING
102
Situation 1: L1 or L2 error is displayed immediately after the outdoor unit is switched on
L1 - L2
↓
The P N +15V wire on the refrigerant circuit board is
not connected properly (1)
YES
→
Ensure P N +15V wire is connected properly
NO
↓
The voltage between N and +15 is incorrect (2)
YES →
Check the +15V circuit (3)
NO
↓
DC voltage between terminals P and N is incorrect
YES →
Check the power supply, three-phase bridge
rectifier (4)
NO
↓
Replace main PCB
Notes:
1 P N +15V terminal on the refrigerant circuit board.
2 Voltage between N and +15.
3 Check the +15V circuit according to the corresponding wiring diagram. If the output power supply of the
inverter module in IC4/5/6PIN12 is not +15V, the inverter module is faulty. If the output power supply of the
inverter module is +15V, the main PCB is faulty.
4 Check the bridge rectifier using one of the two following methods
• Method 1: measure the resistance between two of the 5 bridge rectifier terminals. If one of the resistances is
close to zero, the bridge rectifier is faulty.
• Method 2: use a multimeter to set the diode:
• put the red probe on the negative DC power output terminal (terminal 5) and put the black probe on each
of the AC power input terminals (terminals 1, 2 and 3) in turn. The voltage between terminal 5 and each of
terminals 1, 2 and 3 should be approximately 0.378 V. If the voltage is 0, the bridge rectifier has failed.
• put the red probe on the positive DC power output terminal (terminal 4) and put the black probe on each
of the AC power input terminals (terminals 1, 2 and 3) in turn. The voltage between terminal 4 and each of
terminals 1, 2 and 3 should be infinite. If the voltage is 0, the bridge rectifier is faulty.
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