31
HWE1305A
TROUBLESHOOTING
9-3. Self-diagnosis action table
Note: Refer to the manual of outdoor unit for the details of display such as F, U, and other E.
Error Code
Abnormal point and detection method
Cause
Countermeasure
P1
Room temperature thermistor (TH1)
1
The unit is in 3-minute resume prevention
mode if short/open of thermistor is
detected. Abnormal if the unit does not
reset normally after 3 minutes. (The unit
returns to normal operation, if it has been
reset normally.)
2
Constantly detected during cooling, drying,
and heating operation.
Short: -90°C or more
Open: -40°C or less
1
Defective thermistor
characteristics
2
Contact failure of connector
(CN20) on the indoor controller
board (Insert failure)
3
Breaking of wire or contact
failure of thermistor wiring
4
Defective indoor controller
board
1
–
3
Check resistance value of thermistor.
0°C: 15.0kΩ
10°C: 9.6kΩ
20°C: 6.3kΩ
30°C: 4.3kΩ
40°C: 3.0kΩ
If you put force on (draw or bend) the lead wire
while measuring resistance value of thermistor,
breaking of wire or contact failure can be
detected.
2
Check contact failure of connector (CN20)
on the indoor controller board. Refer to 9-7.
Turn the power on again and check restart
after inserting connector again.
4
Check room temperature display on remote
controller.
Replace indoor controller board if there is
abnormal difference with actual room
temperature.
Turn the power off, and on again to operate
after check.
P2
Pipe temperature thermistor/Liquid (TH2)
1
The unit is in 3-minute resume prevention
mode if short/open of thermistor is
detected. Abnormal if the unit does not
reset normally after 3 minutes. (The unit
returns to normal operation, if it has been
reset normally.)
2
Constantly detected during cooling, drying,
and heating (except defrosting) operation.
Short: 90°C or more
Open: -40°C or less
1
Defective thermistor
characteristics
2
Contact failure of connector
(CN44) on the indoor controller
board (Insert failure)
3
Breaking of wire or contact
failure of thermistor wiring
4
Defective refrigerant circuit is
causing thermistor temperature
of 90°C or more or -40°C or
less.
5
Defective indoor controller
board
1
–
3
Check resistance value of thermistor.
For characteristics, refer to (P1) above.
2
Check contact failure of connector (CN44)
on the indoor controller board. Refer to 9-7.
Turn the power on and check restart after
inserting connector again.
4
Check pipe <liquid> temperature with remote
controller in test run mode. If pipe <liquid>
temperature is extremely low in cooling
mode, refrigerant circuit may have defective.
5
Check pipe <liquid> temperature with remote
controller in test run mode. If there is
extremely difference with actual pipe
<liquid> temperature, replace indoor
controller board.
Turn the power off, and on again to operate
after check.
P4
(5701)
Contact failure of drain float switch (CN4F)
1
Extract when the connector of drain float
switch is disconnected.
(
3
and
4
of connector CN4F is not
short-circuited.)
2
Constantly detected during operation.
1
Contact failure of connector
(Insert failure)
2
Defective indoor controller
board
1
Check contact failure of float switch
connector.
Turn the power on again and check after
inserting connector again.
2
Operate with connector (CN4F) short-
circuited.
Replace indoor controller board if
abnormality reappears.
P5
Drain overflow protection operation
1
Suspensive abnormality, if drain float
switch is detected to be underwater for 1
minute and 30 seconds continuously with
drain pump on.
Turn off compressor and indoor fan.
2
Drain pump is abnormal if the condition
above is detected during suspensive
abnormality.
3
Constantly detected during drain pump
operation.
1
Malfunction of drain pump
2
Defective drain
Clogged drain pump
Clogged drain pipe
3
Defective drain float switch
Jamming of drain float switch
or malfunction of moving parts
causing drain float switch to be
detected under water (Switch
On)
4
Defective indoor-controller
board
1
Check if drain pump operates.
2
Check drain function.
3
Remove drain float switch connector CN4F
and check if it is short (Switch On) with the
moving part of float switch UP, or OPEN with
the moving part of float switch down.
Replace float switch if it is short with the
moving part of float switch down.
4
Replace indoor controller board if it is
short-circuited between
3
-
4
of the drain
float switch connector CN4F and
abnormality reappears.
It is not abnormal if there is no problem about
the above-mentioned
1
~
4
Turn the power off, and on again to operate
after check.
