26
Installation and Maintenance
Service Manual
9. Maintenance
No.
Malfunction
Name
Display Method
A/C Status
Possible Causes
Dual-8
Code
Display
Indicator Display (during
blinking, ON 0.5s and OFF
0.5s)
Operation
Indicator
Cool
Indicator
Heat
Indicator
22
Voltage of
DC bus-bar
is too low
PL
OFF 3S
and blink
21 times
During cooling and drying operation,
compressor will stop while indoor
fan will operate;During heating
operation, the complete unit will stop
1. Measure the voltage of position
L and N on wiring board (XT), if the
voltage is higher than 150VAC,turn
on the unit after the supply voltage is
increased to the normal range.
2.If the AC input is normal, measure
the voltage of electrolytic
capacitor C on control panel (AP1),
if its normal, theres malfunction for
the circuit, please replace the control
panel (AP1)
23
Compressor
Min frequence
in test state
P0
(during
blinking,
ON
0.25s
and OFF
0.25s)
(during
blinking,
ON
0.25s
and OFF
0.25s)
Showing during min. cooling or min.
heating test
24
Compressor
rated
frequence in
test state
P1
(during
blinking,
ON
0.25s
and OFF
0.25s)
(during
blinking,
ON
0.25s
and OFF
0.25s)
Showing during nominal cooling or
nominal heating test
25
Compressor
maximum
frequence in
test state
P2
(during
blinking,
ON
0.25s
and OFF
0.25s)
(during
blinking,
ON
0.25s
and OFF
0.25s)
Showing during max. cooling or
max. heating test
26
Compressor
intermediate
frequence in
test state
P3
(during
blinking,
ON
0.25s
and OFF
0.25s)
(during
blinking,
ON
0.25s
and OFF
0.25s)
Showing during middle cooling or
middle heating test
27
Overcurrent
protection of
phase
current for
compressor
P5
OFF 3S
and blink
15 times
During cooling and drying operation,
compressor will stop while indoor
fan will operate;During heating
operation, the complete unit will stop
operation.
Refer to the malfunction
analysis (IPM protection, loss
of synchronism protection and
overcurrent protection of phase
current for compressor.
