Troubleshooting MCAC-UTSM-2008-11
122 Outdoor Units
(2) For the 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 can not 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
Lack of phase
Check the power supply, is it 3 phase, 380-415V?
Check the connection between power supply and terminal, is
the voltage in outdoor terminal is 3 phase, 380-415V?
Outdoor PCB is defective
Yes
Yes
Possible reason
1. Outdoor fan is defective
2. The compressor is defective
3. Refrigerant is over charged
4. Air enter the refrigerant system
5. Heat exchanger is too dirty
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