18
E6
1Contact failure, short circuit or,
miswiring (converse wiring) of
indoor/outdoor unit connecting
wire
2Defective transmitting receiving
circuit of indoor controller board
3Defective transmitting receiving
circuit of indoor controller board
4Noise has entered into indoor/
outdoor unit connecting wire.
∗Check LED display on the outdoor control cir-
cuit board. (Connect A-control service tool,
PAC-SK52ST.)
Refer to EA-EC item if LED displays EA-EC.
1Check disconnection or looseness of indoor/
outdoor unit connecting wire of indoor unit or
outdoor unit.
Check all the units in case of twin indoor
unit system.
2-4Turn the power off, and on again to
check. If abnormality generates again,
replace indoor controller board or outdoor
controller circuit board.
∗Other indoor controller board may have
defect in case of twin indoor unit system.
E7
Indoor/outdoor unit communication
error (Transmitting error)
Abnormal if “1” receiving is detected 30
times continuously though indoor controller
board has transmitted “0”.
1Defective transmitting receiving
circuit of indoor controller board
2Noise has entered into power
supply.
3Noise has entered into outdoor
control wire.
1-3Turn the power off, and on again to
check. If abnormality generates again,
replace indoor controller board.
Indoor/outdoor unit communication
error (Signal receiving error)
1Abnormal if indoor controller board
cannot receive any signal normally for 6
minutes after turning the power on.
2Abnormal if indoor controller board
cannot receive any signal normally for 3
minutes.
3Consider the unit as abnormal under the
following condition: When 2 or more
indoor units are connected to 1
outdoor unit, indoor controller board
cannot receive a signal for 3 minutes
from outdoor controller circuit board, a
signal which allows outdoor controller
circuit board to transmit signals.
Error Code Abnormal point and detection method Cause Countermeasure
Fb
Indoor controller board
Abnormal if data cannot be normally read
from the nonvolatile memory of the indoor
controller board.
1Defective indoor controller
board
1Replace indoor controller board.
E1
or
E2
Remote controller control board
1Abnormal if data cannot be normally
read from the nonvolatile memory of the
remote controller control board.
(Error code: E1)
2Abnormal if the clock function of remote
controller cannot be normally operated.
(Error code: E2)
1Defective remote controller 1Replace remote controller.
PA
(2502)
(2500)
Forced compressor stop
(due to water leakage abnormality)
1
When the intake temperature subtracted
with liquid pipe temperature is less than
-10:(14˚F), drain sensor detects
whether it is soaked in the water or not
at the interval of 90 seconds.
(Drain
pump will start operating when the drain sen-
sor detects to be soaked in the water.)
2The unit has a water leakage abnormality
when the following conditions, a and b,
are satisfied while the above-mentioned
detection is performed.
a) The drain sensor detects to be
soaked in the water 10 times in a row.
b) The intake temperature subtracted
with liquid pipe temperature is detect-
ed to be less than -10:(14˚F) for a
total of 30 minutes. (When the drain
sensor detects to be NOT soaked in
the water, the detection record of a
and b will be cleared.)
3The drain sensor detection is performed
in operations other than cooling. (When
the unit stops operating, during heating
or fan operation, when the unit stops
because of some abnormality)
*Once the water leakage abnormality is
detected, abnormality state will not be
released until the main power is reset.
1Drain pump trouble
2Drain defective
· Drain pump clogging
· Drain pipe clogging
3Open circuit of drain sensor
side heater
4Contact failure of drain sensor
connector
5Dew condensation on drain
sensor
· Drain water trickles along
lead wire.
· Drain water waving due to filter
clogging
6Extension piping connection
difference at twin system
7Miswiring of indoor/ outdoor
connecting at twin system
8Room temperature thermistor /
liquid pipe temperature thermis-
tor detection is defective.
1Check the drain pump.
2Please confirm whether water can be
drained.
3Confirm the resistance of the drain sensor.
4Check the connector contact failure.
5Check the drain sensor leadwire mounted.
Check the filter clogging.
6Check the piping connection.
7Check the indoor/ outdoor connecting wires.
8Check the room temperature display of
remote controller.
Check the indoor liquid pipe temperature
display of outdoor controller board.
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