19
OCHT669
Check code
Abnormal point and detection method
Cause
Countermeasure
P6
Freezing/overheating protection is
operating
Freezing protection (Cooling mode)
The unit is in 6-minute resume prevention
mode if pipe <liquid or condenser/
evaporator> 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.
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 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
Converse connection of
extension pipe (on plural units
connection)
Converse wiring of indoor/
outdoor unit connecting wire (on
plural units connection)
Defective detection of indoor
room temperature and pipe
<condenser/evaporator>
temperature thermistor
Stop valve is not opened
completely.
(Cooling or drying mode)
1
Clogged filter (reduced airflow)
Short cycle of air path
Low-load (low temperature)
operation out of the tolerance
range
Defective indoor fan motor
• Fan motor is defective.
• Indoor controller board is
defective.
Defective outdoor fan control
Overcharge of refrigerant
Defective refrigerant circuit
(clogging)
(Heating mode)
1
Clogged filter (reduced airflow)
Short cycle of air path
Overload (high temperature)
operation out of the tolerance
range
Defective indoor fan motor
• Fan motor is defective.
• Indoor controller board is
defective.
Defective outdoor fan control
Overcharge of refrigerant
Defective refrigerant circuit
(restriction)
Bypass circuit of outdoor unit is
defective.
(Cooling or drying mode)
1
Check cleanliness of the filter.
Remove blockage.
Refer to "8-7-2. DC Fan Motor (Fan Motor /
Indoor Controller Board)".
Check outdoor fan motor.
Check operating condition of refrigerant
circuit.
(Heating mode)
1
Check cleanliness of the filter.
Remove blockage.
4
Refer to "8-7-2. DC Fan Motor (Fan Motor /
Indoor Controller Board)".
Check outdoor fan motor.
– 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 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
– Check pipe <liquid or condenser/
evaporator> temperature with room
temperature display on remote controller
and outdoor controller circuit board.
Pipe <liquid or condenser/evaporator>
temperature display is indicated by setting
SW2 of outdoor controller circuit board as
follows.
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)’.
(
)
Drain pump lock protection operation
1
Suspected abnormality, if drain pump
stops for 5 seconds continuously with
drain pump on.
Drain pump will be restarted after turning
off for 10 seconds.
2
Drain pump is abnormal if the condition
above is detected 4 times during
operation.
1
Malfunction of drain pump
2
Clogged drain pump
Disconnected drain pump
Defective indoor controller board
12
Check if drain pump works.
Check if connector (CNP) is connected.
Turn the emergency operation switch (SWE)
on and check the voltage between CNP
1
– .
• Replace drain pump if the output is 13V DC.
• Replace indoor controller board if the output
is under 13V DC.
P5
*1: only P-series outdoor unit
*1
