18
ErrorCode Abnormalpoint and detection method Cause Countermeasure
P9
Pipetemperature thermistor/
Condenser-Evaporator(TH5)
Theunit is in 3-minute resume protec-
tionmode if short/open of thermistor is
detected.Abnormal if theunit doesnot
getback to normal within 3 minutes. (The
unitreturns to normal operation, if it has
beenreset normally.)
Constantlydetected during cooling,
drying,and heating operation (except
defrosting)
Defectivethermistor
characteristics
Contactfailure of connector
(CN44)on the indoor controller
board(Insert failure)
Breakingof wire or contact
failureof thermistor wiring
Temperatureof thermistor is
defectiverefrigerant circuit.
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.
Operatein test run mode and check pipe <con-
denser/evaporator>temperature with outdoor
controllercircuit board. If pipe
<condenser/evaporator>temperature is exclu-
sivelylow (in cooling mode) or high (in heating
mode),refrigerant circuit may have defect.
Operatein test run mode and check pipe <con-
denser/evaporator>temperature with outdoor
controlcircuit board. If there is
extremedifference with actual pipe
<condenser/evaporator>temperature, replace
indoorcontroller board.
Thereis no abnormality if none of above comes
withinthe unit.
Turnthe power off and on again to operate.
E0
or
E4
Remotecontroller transmission
error(E0)/signalreceiving error(E4)
Abnormalif main or sub remote con-
trollercannot receive any transmission
normallyfrom indoor unit of refrigerant
address“0” for 3 minutes.
(Errorcode : E0)
Abnormalif sub remote controller could
notreceive for any signal for 2 minutes.
(Errorcode: E0)
Abnormalif indoor controller board
cannotreceive any data normally from
remotecontroller board or from other
indoorcontroller board for 3 minutes.
(Errorcode: E4)
Indoorcontroller board cannot receive
anysignal from remote controller for 2
minutes.(Error code: E4)
Checkdisconnection or looseness of indoor
unitor transmission wire of remote controller.
Setone of the remote controllers “main”
ifthere is no problem with the action above.
Checkwiring of remote controller.
(Donot use cable 3or more.)
• The number of connecting indoor units:
max.16 units
• The number of connecting remote control-
ler:max. 2 units
Whenthe above-mentioned problem of ~
arenot applied,
Diagnoseremote controllers.
a)When “RC OK” is displayed, remote con-
trollershave noproblem. Turn the power
off,and on again to check. If abnormality
generatesagain, replace indoor controller
board.
b)When “RC NG” is displayed, replace
remotecontroller.
c)When “RCE3” or “ERC 00-06”is dis-
played, noise may be causing abnormality.
Ifthe unit is not normal after replacing
indoorcontroller board in group control,
indoorcontroller board of address “0”
maybe abnormal.
Contactfailure at transmission
wireof remote controller
Allremote controllers are set
as“sub” remote controller. In
thiscase, E0 is displayed on
remotecontroller, and E4 is
displayed at LED (LED1, LED2)
onthe outdoor controller circuit
board.
Miswiringof remote controller
Defectivetransmitting receiving
circuitof remote controller
Defectivetransmitting receiving
circuitof indoor controller board
ofrefrigerant addresses “0 ”.
Noisehas entered into the
transmissionwire of remote
controller.
Incase of checking pipe temperature
withoutdoor controller circuit board,
besure to connect A-control service
tool(PAC-SK52ST).
()
PA
(2500)
Forcedcompressor stop
(dueto water leakage abnormality)
Theunit has a water leakage abnor-
malitywhen the following conditions, a)
andb), are satisfied while the above-
mentioneddetection is performed.
a)The intake temperaturesubtracted
withliquid pipe temperature detects to
beless than -10 [14
30minutes. (When the drain sensor
isdetected to be NOT soaked in the
water,the detection record of a) and b)
willbe cleared.)
b)Drain float switch detects to be in the
waterfor more than 15 minutes.
*Oncethe water leakage abnormality is
detected,abnormality state will not be
releaseduntil the main power is reset.
Drainpump trouble
Draindefective
·Drain pump clogging
·Drain pipe clogging
Opencircuit of float switch
Contactfailure of float switch
connector
Dewcondensation on float switch
·Drainwater descends along
leadwire.
·Drainwater waving due to filter
clogging.
Extensionpiping connection
differenceat twin, triple, quad-
ruplesystem.
Miswiringof indoor/outdoor
connectingat twin, triple, quad-
ruplesystem.
Roomtemperature thermistor/
liquidpipe temperature thermis-
tordetection is defective.
Checkthe drain pump.
Checkwhether water can be drained.
Checkthe resistance of the float switch.
Checkthe connector contact failure.
Checkthe float switch leadwire mounted.
Checkthe filter clogging.
Checkthe piping connection.
Checkthe indoor/outdoor connecting wires.
Checkthe room temperature display of
remotecontroller.
Checkthe indoor liquid pipe temperature dis-
playof outdoor controller board.