20
21
E6
E7
Abnormal point and detection method
Cause
Countermeasure
Fb
E1
or
E2
PA
Forced compressor stop
(due to water leakage abnormality)
1
When the intake temperature subtracted
with liquid pipe temperature is less than
−10
:
, drain sensor is detected whether
it is soaked in the water or not at the
interval of 90 seconds. (Drain pump will
start operating when the drain sensor is
detected to be soaked in the water.)
2
The 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 is detected to be
soaked in the water 10 times in a row.
b) The intake temperature subtracted
with liquid pipe temperature is
detected to be less than -10
:
for a
total of 30 minutes.
(When the drain sensor is detected
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)
Note:
Once the water leakage abnormality is
detected, abnormality state will not be
released until the main power is reset.
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 descends along
lead wire.
· Drain water is waving due to
filter clogging.
6
Extension piping connection
difference at twin, triple or
quadruple system
7
Miswiring of indoor/ outdoor con-
necting at twin, triple or quadruple
system
8
Room temperature thermistor /
liquid pipe temperature thermistor
detection is defective.
1
Check the drain pump.
2
Please confirm whether water can be
drained.
3
Confirm the resistance of the drain sensor.
4
Check the connector contact failure.
5
Check the drain sensor leadwire 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
display of outdoor controller board.
1
Contact failure, short circuit or,
miswiring (converse wiring) of
indoor/outdoor unit connecting
wire
2
Defective transmitting receiving
circuit of indoor controller board
3
Defective transmitting receiving
circuit of indoor controller board
4
Noise has entered into indoor/
outdoor unit connecting wire.
Note:
Check LED display on the outdoor control
circuit board. (Connect A-control service
tool, PAC-SK52ST.)
Refer to outdoor unit service manual.
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 triple
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.
Note:
Other indoor controller board may have defect
in the case of twin triple indoor unit system.
Indoor/outdoor unit communication
error (Transmitting error)
Abnormal if “1” receiving is detected 30
times continuously though indoor controller
board has transmitted “0”.
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
-
3
Turn the power off, and on again to check.
If abnormality generates again, replace
indoor controller board.
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
minutes.
3
Consider the unit abnormal under the
following condition: When 2 or more
indoor units are connected to an 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 controller board
Abnormal if data cannot be read normally
from the nonvolatile memory of the indoor
controller board.
1
Defective indoor controller
board
1
Replace indoor controller board.
Remote controller control board
1
Abnormal if data cannot be read
normally from the nonvolatile memory
of the remote controller control board.
(Check code: E1)
2
Abnormal if the clock function of remote
controller cannot be operated normally.
(Check code: E2)
1
Defective remote controller
1
Replace remote controller.
Check Code
OCH492A
