15
Error Code
Abnormal point and detection method
Cause
Countermeasure
P6
Freezing/overheating protection is oper-
ating
1
Freezing protection (Cooling mode)
The unit is in 6-minute resume prevention
mode if pipe <liquid or condenser/evap-
orator> temperature stays under 5°F for
3 minutes after the compressor started.
Abnormal if it stays under 5°F for 3
minutes again within 16 minutes after
6-minute resume prevention mode.
2
Overheating protection (Heating mode)
The units is in 6-minute resume
prevention mode if pipe <condenser /
evaporator> temperature is detected as
over 158°F after the compressor started.
Abnormal if the temperature of over
158°F is detected again within 10 min-
utes 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
(clogging)
(Heating mode)
1
Clogged filter (reduced airflow)
2
Short cycle of air path
3
Overload (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
(clogging)
8
Bypass circuit of outdoor unit
is defective.
(Cooling or drying mode)
1
Check clogging of the filter.
2
Remove blockage.
4
Measure the resistance of fan motor's winding.
Measure the output voltage of fan's connector
(FAN) on the indoor controller board.
W
The indoor controller board should be
normal when voltage of AC 208/230V is
detected while fan motor is connected.
Refer to 6-4.
5
Check outdoor fan motor.
67
Check operating condition of refrigerant
circuit.
(Heating mode)
1
Check clogs of the filter.
2
Remove blockage.
4
Measure the resistance of fan motor's
winding.
Measure the output voltage of fan's connector
(FAN) on the indoor controller board.
W
The indoor controller board should be
normal when voltage of AC 208/230V is
detected while fan motor is connected.
Refer to 6-4.
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 min. to detect.
Note 2) Abnormality P8 is not detected in
drying mode.
Cooling range : -5.4 deg
]
(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 deg
[
(TH5-TH1)
1
~
4
Check pipe <liquid or condenser /
evaporator> temperature with room
temperature display on remote
controller
board.
23
Check converse connection of extension
pipe or converse wiring of indoor/outdoor
unit connecting wire.
