107
Troubleshooting (Cont.)
Solving steps for typical malfunction (Cont.)
(2) For outdoor unit
a. Phase sequence error
b. Overload of current
c. Lack of phase
Phase sequence error
Change the order of two of the wires to power supply.
Switch on the unit again.
If the problem cannot be solved, the outdoor PCB is defective
Overload of current
Check the current, normally
Is the current in rated range?
The outdoor PCB is defective
Yes
No
Possible reason
1. Outdoor fan is defective
2. Compressor is defective
3. Refrigerant is over charged
4. Air enter the refrigerant system
5. Outdoor coil is too dirty
Check the power supply, is it 3 phase,
380-420V?
Check the connection between power supply and terminal,
is the voltage in outdoor terminal is 3 phase, 380-420V?
Yes
Lack of phase
Yes
Outdoor PCB is defective
To Next Page
Loading...
Need help?
General
