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Abnormal point and detection method
Error Code
Indoor/outdoor unit communication
error (Signal receiving error)
1 Abnormal if indoor controller board
cannot receive any signal normally for 6
minutes after turning the power on.
2 Abnormal if indoor controller board
cannot receive any signal normally for 3
E6
minutes.
3 Consider the unit abnormal under the fol-
lowing condition: When 2 or more indoor
units are connected to one
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.
Indoor/outdoor unit communication
error (Transmitting error)
Abnormal if "1" receiving is detected 30
E7
times continuously though indoor controller
board has transmitted "0".
Indoor controller board
Abnormal if data cannot be normally read
Fb
from the nonvolatile memory of the indoor
controller board.
Remote controller control board
1 Abnormal if data cannot be normally
read from the nonvolatile memory of the
remote controller control board.
E1
(Error code: E1)
or
E2
2 Abnormal if the clock function of remote
controller cannot be normally operated.
(Error code: E2)
Forced compressor stop
(due to water leakage abnormality)
1 When the intake temperature subtracted
with liquid pipe temperature is less than
-10°C, 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 sensor detects
to be soaked in the water.)
2 The unit has a water leakage abnormal-
ity when the following conditions, a)
and b), are satisfied while the above-
mentioned detection is performed.
a) The drain sensor detects to be
PA
soaked in the water 10 times in a row.
(2502)
b) The intake temperature subtracted
(2500)
with liquid pipe temperature is detect-
ed to be less than -10°C 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.)
3 The 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.
Cause
1 Contact failure, short circuit or,
miswiring (converse wiring) of
indoor/outdoor unit connecting
wire
2 Defective transmitting/receiv-
ing circuit of indoor controller
board
3 Defective transmitting/receiv-
ing circuit of indoor controller
board
4 Noise has entered into indoor/
outdoor unit connecting wire.
1 Defective transmitting receiving
circuit of indoor controller board
2 Noise has entered into power
supply.
3 Noise has entered into outdoor
control wire.
1 Defective indoor controller
board
1 Defective remote controller
1 Drain pump trouble
2 Drain defective
· Drain pump clogging
· Drain pipe clogging
3 Open circuit of drain sensor
side heater
4 Contact failure of drain sensor
connector
5 Dew condensation on drain
sensor
· Drain water trickles along
lead wire.
· Drain water waving due to filter
clogging
6 Extension piping connection
difference at twin, triple,
quadruple system
7 Miswiring of indoor/outdoor
connecting at twin, triple,
quadruple system
8 Room temperature thermistor/
liquid pipe temperature themis-
tor detection is defective.
17
Countermeasure
1 Check 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.
2-4 Turn 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.
1-3 Turn the power off, and on again to check.
If abnormality generates again, replace
indoor controller board.
1 Replace indoor controller board.
1 Replace remote controller.
1 Check the drain pump.
Performance
2 Please check whether water can be drained.
3 Check the resistance of the drain sensor
side heater.
4 Check the connector contact failure.
5 Check the drain sensor lead wire mounted.
Check the filter clogging.
6 Check the piping connection.
7 Check the indoor/outdoor connecting wires.
8 Check the room temperature display of
remote controller.
Check the indoor liquid pipe temperature dis-
play of outdoor controller board.
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