22
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 >
í
4°F [
í
20
:
]
The unit is in 6-minute resume preven-
tion mode if pipe <liquid or condenser/
evaporator> temperature stays under
í
5°F [
í
15
:
] for 3 minutes, 3 minutes
after the compressor started.
Abnormal if it stays under
í
5°F [
í
15
:
]
for 3 minutes again within 16 minutes
after 6-minute resume prevention mode.
In case when
outside temperature
[
í
4°F [
í
20
:
]
The unit is in 6-minute resume preven-
tion mode if pipe <liquid or condenser/
evaporator> temperature stays under
í
31°F [
í
35
:
] for 3 minutes, 3 minutes
after the compressor started.
Abnormal if it stays under
í
31°F [
í
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.
(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 refriger-
ant
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 refriger-
ant circuit.
P8
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:
í
5.4°F [
í
3°C]
]
(TH
í
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
í
TH1)
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.
1
–
4
Check pipe <liquid or condenser/
evaporator> temperature with room
temperature display on remote con-
troller and outdoor controller circuit
board.
Pipe <liquid or condenser/evapora-
tor> temperature display is indicated
by setting SW2 of outdoor controller
circuit board as follows.
Conduct temperature check with outdoor
controller circuit board after connecting
µ
A-Control Service Tool(PAC-SK52ST)’.
23
Check converse connection of exten-
sion pipe or converse wiring of indoor/
outdoor unit connecting wire.
(
(
OCH638
