78
Installation and Maintenance
Service Manual
9. Maintenance
8.Malfunction diagnosis for failure startup
Main check points:
(1) compressor wire (2) compressor (3) charging amount of refrigerant
NOTE:The control board as below means the control board of outdoor unit.
N
N
Y
N
Y
N
Y
N
Y
Y
N
Put through the
power and turn on
the unit
The time for stop operation is not enough and
the system's high pressure and low pressure is
unbalanced. Please wait for 3mins and then
turn on the unit again.
Check whether the compressor
has stopped operation for more than
3mins.
Please improve the connection between
the control board and the compressor
and then connect it well according to
the wiring diagram.
Does the unit started
up normally?
Check whether the compressor wire
(UVW) is connected and the connection sequence
is correct.
Check whether the charging
amount of refrigerant is too much.
Charge the refrigerant according to
the Service Manual.
Does the unit started
up normally?
Replace the control board
Eliminate malfunction
Replace the compressor
End
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