16
9-3. SELF-DIAGNOSIS ACTION TABLE
Note:Refer to the manual of outdoor unit for the details of display
suchas F,U, and other E.
ErrorCode Abnormalpoint and detection method Cause Countermeasure
P1
Roomtemperature thermistor (TH1)
Theunit is in 3-minute resume
preventionmode if short/open of
thermistoris detected. Abnormal if the
unitdoes not reset normally after 3 min-
utes.(The unit returns to normal opera-
tion,if it has been reset normally.)
Constantlydetected during cooling,
drying,and heating operation.
Short:90
Open:-40
Defectivethermistor
characteristics
Contactfailure of connector
(CN20)on the indoor controller
board(Insert failure)
Breakingof wire or contact
failureof thermistor wiring
Defectiveindoor controller
board
–Checkresistance value of thermistor.
0••••••••••15.0k
10 ••••••••••••9.6k
20 ••••••••••••6.3k
30 ••••••••••••4.3k
40 •••••••••••
3.0k
Ifyou put force on (draw or bend) the lead wire
whilemeasuring resistance value of thermis-
tor,breaking of wire or contact failure can be
detected.
Checkcontact failure of connector (CN20) on
theindoor controller board. Refer to 9-7.
Turnthe power on again and check restart
afterinserting connector again.
Checkroom temperature display on remote
controller.
Replaceindoor controller board if there is
abnormaldifference with actual room
temperature.
Turnthe power off, and on again to operate
aftercheck.
P2
Pipetemperature thermistor/Liquid
(TH2)
Theunit is in 3-minute resume
preventionmode if short/open of
thermistoris detected.Abnormal if the
unitdoes not reset normally after 3 min-
utes.(The unit returns to normal opera-
tion,if it has been reset normally.)
Constantlydetected during cooling,
drying,and heating (except defrosting)
operation.
Short:90
Open:-40
Defectivethermistor
characteristics
Contactfailure of connector
(CN44)on the indoor controller
board(Insert failure)
Breakingof wire or contact
failureof thermistor wiring
Defectiverefrigerant circuit is
causingthermistor tempera-
tureof 90
-40
Defectiveindoor controller
board
–Checkresistance value of thermistor.
Forcharacteristics, refer to (P1) above.
Checkcontact failure of connector (CN44) on
theindoor controller board. Refer to 9-7.
Turnthe power on and check restart after
insertingconnector again.
Checkpipe <liquid> temperature with remote
controllerin test run mode. If pipe <liquid>
temperatureis extremely low (in cooling
mode)or high (in heating mode), refrigerant
circuitmay have defect.
Checkpipe <liquid> temperature with remote
controllerin test run mode. If there is extremely
differencewith actual pipe <liquid> temperature,
replaceindoor controller board.
Turnthe power off, and on again to operate
aftercheck.
P4
(5701)
Contactfailure of drain float switch (CN4F)
Extractwhen the connector of drain float
switchis disconnected.
( and of connector CN4F is not
short-circuited.)
Constantlydetected during operation.
Contactfailure of connector
(Insertfailure)
Defectiveindoor controller
board
Checkcontact failure of float switch connec-
tor.
Turnthe power on again and check after
insertingconnector again.
Operatewith connector (CN4F) short-circuited.
Replaceindoor controller board if abnormality
reappears.
P5
Drainoverflow protection operation
Suspensiveabnormality, if drain float
switchis detected to be underwater for
1minute and 30 seconds continuously
withdrain pump on.
Turnoff compressor and indoor fan.
Drainpump is abnormal if the condition
aboveis detected during suspensive
abnormality.
Constantlydetected during drain pump
operation.
Malfunctionof drain pump
Defectivedrain
Cloggeddrain pump
Cloggeddrain pipe
Defectivedrain float switch
Catchof drain float switch or
malfunctionof moving parts
causedrain float switch to be
detectedunder water (Switch
On)
Defectiveindoor-controller
board
Checkif drain pumpworks.
Checkdrain function.
Removedrain float switch connector CN4F
andcheck if it is short (Switch On) with the
movingpart of float switch UP, or OPEN with
themoving part of float switch down.
Replacefloat switch if it is short with the
movingpart of float switch down.
Replaceindoor controller board if it is short-
circuitedbetween - of the drain float
switchconnector CN4F and abnormality
reappears.
Itis not abnormal if there is no problem about
theabove-mentioned ~
Turnthe power off, and on again to operate
aftercheck.