59
Installation and Maintenance
Service Manual
No. Malfunction Name
Display Method of
Indoor Unit
A/C status Possible Causes
Dual-8 Code
Display
21
Voltage for DC bus-bar is
too high
PH
During cooling and drying operation, compressor
will stop while indoor fan will operate;
During heating operation, the complete unit will
stop operation.
1. Measure the voltage of position L and N on
wiring board (XT), if the voltage is higher than
265VAC, 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 it's normal, There's malfunction for the circuit,
please replace the control panel (AP1)
22
Voltage of DC bus-bar is
too low
PL
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 it's normal, There's malfunction for the circuit,
please replace the control panel (AP1)
23
Compressor Min
frequence in test state
P0 Showing during min. cooling or min. heating test
24
Compressor rated
frequence in test state
P1
Showing during nominal cooling or nominal
heating test
25
Compressor maximum
frequence in test state
P2 Showing during max. cooling or max. heating test
26
Compressor intermediate
frequence in test state
P3
Showing during middle cooling or middle heating
test
27
Overcurrent protection of
phase current for
compressor
P5
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.
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