20
Check code Abnormal point and detection method
Cause
Countermeasure
P6
Freezing/overheating protection is work-
ing
1
Freezing protection (Cooling mode)
• In case when
outside temperature > −4°F [−20
:
]
The unit is in 6-minute resume preven-
tion mode if pipe <liquid or condenser/
evaporator> temperature stays under
−5°F [−15
:
] for 3 minutes, 3 minutes
after the compressor started.
Abnormal if it stays under −5°F [−15
:
]
for 3 minutes again within 16 minutes
after 6-minute resume prevention mode.
• In case when
outside temperature
[
−4°F [−20
:
]
The unit is in 6-minute resume preven-
tion mode if pipe <liquid or condenser/
evaporator> temperature stays under
−31°F [−35
:
] for 3 minutes, 3 minutes
after the compressor started.
Abnormal if it stays under −31°F [−35
:
]
for 3 minutes again within 16 minutes
after 6-minute resume prevention mode.
2
Overheating protection (Heating mode)
The unit is in 6-minute resume
prevention mode if pipe <liquid or con-
denser/evaporator> temperature is
detected as over 158°F [70
:
] after the
compressor started. Abnormal if the tem-
perature of over 158°F [70
:
] is detected
again within 30 minutes after 6-minute
resume prevention mode.
P8
1
Slight temperature difference
between indoor room
temperature and pipe <liquid
or condenser/evaporator>
temperature thermistor
• Shortage of refrigerant
• Disconnected holder of pipe
<liquid or condenser/
evaporator> thermistor
• Defective refrigerant circuit
2
Converse connection of
extension pipe (on plural units
connection)
3
Converse wiring of indoor/
outdoor unit connecting wire
(on plural units connection)
4
Defective detection of indoor
room temperature and pipe
<condenser/evaporator>
temperature thermistor
5
Stop valve is not opened
completely.
(Cooling or drying mode)
1
Clogged filter (reduced airflow)
2
Short cycle of air path
3
Low-load (low temperature)
operation out of the tolerance
range
4
Defective indoor fan motor
• Fan motor is defective.
• Indoor controller board is defec-
tive.
5
Defective outdoor fan control
6
Overcharge of refrigerant
7
Defective refrigerant circuit
(clogs)
(Heating mode)
1
Clogged filter (reduced airflow)
2
Short cycle of air path
3
Over-load (high temperature)
operation out of the tolerance
range
4
Defective indoor fan motor
• Fan motor is defective.
• Indoor controller board is defec-
tive.
5
Defective outdoor fan control
6
Overcharge of refrigerant
7
Defective refrigerant circuit
(clogs)
8
Bypass circuit of outdoor unit is
defective.
(Cooling or drying mode)
1
Check clogs of the filter.
2
Remove shields.
4
Refer to "9-6. HOW TO CHECK THE
PARTS".
5
Check outdoor fan motor.
67
Check operating condition of refrigerant
circuit.
(Heating mode)
1
Check clogs of the filter.
2
Remove shields.
4
Refer to "9-6. HOW TO CHECK THE
PARTS".
5
Check outdoor fan motor.
6
–
8
Check operating condition of refrigerant
circuit.
Pipe temperature
<Cooling mode>
Detected as abnormal when the pipe tem-
perature is not in the cooling range 3 min-
utes after compressor start and 6 minutes
after the liquid or condenser/evaporator
pipe is out of cooling range.
Note 1: It takes at least 9 minutes to
detect.
Note 2: Abnormality P8 is not detected in
drying mode.
Cooling range: −5.4°F [−3°C]
]
(TH−TH1)
TH: Lower temperature between liquid pipe
temperature (TH2) and condenser/
evaporator temperature (TH5)
TH1: Intake temperature
<Heating mode>
When 10 seconds have passed after the
compressor starts operation and the hot
adjustment mode has finished, the unit is
detected as abnormal when condenser/
evaporator pipe temperature is not in heat-
ing range within 20 minutes.
Note 3: It takes at least 27 minutes to
detect abnormality.
Note 4: It excludes the period of defrosting.
(Detection restarts when defrosting
mode is over.)
Heating range: 5.4°F [3°C]
[
(TH5−TH1)
1
–
4
Check pipe <liquid or condenser/evapora-
tor> temperature with room temperature
display on remote controller and outdoor
controller circuit board.
Pipe <liquid or condenser/evaporator>
temperature display is indicated by set-
ting SW2 of outdoor controller circuit
board as follows.
23
Check converse connection of extension
pipe or converse wiring of indoor/outdoor
unit connecting wire.
Conduct temperature check with outdoor
controller circuit board after connecting
‘A-Control Service Tool(PAC-SK52ST)’.
(
)
OCH580
