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Check code
Abnormal point and detection method
Condenser/evaporator temperature ther-
mistor (TH5)
1 The unit is in 3-minute resume protec-
tion mode if short/open of thermistor is
detected. Abnormal if the unit does not
get back to normal within 3 minutes. (The
unit returns to normal operation, if it has
been reset normally.)
2 Constantly detected during cooling,
drying, and heating operation (except
defrosting)
Short: 194°F [90:] or more
P9
Note:
When all of the following conditions have
been satisfied, the error is not detected:
1) During cooling operation, or for 3 min-
utes after cooling operation is stopped.
2) Up to 16 minutes from 10 seconds after
cooling operation is started.
Forced compressor stop
(due to water leakage abnormality)
1 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 intake temperature subtracted with
liquid pipe temperature detects to be
less than
30 minutes. (When the drain sensor
PA
is detected to be NOT soaked in the
water, the detection record of a) and b)
will be cleared.)
b) Drain float switch detects to be in the
water for more than 15 minutes.
Note:
Once the water leakage abnormality is
detected, abnormality state will not be
released until the main power is reset.
Remote controller transmission
error(E0)/signal receiving error(E4)
1 Abnormal if main or sub remote con-
troller cannot receive any transmission
normally from indoor unit of refrigerant
address "0" for 3 minutes.
(Check code: E0)
2 Abnormal if sub remote controller could
not receive any signal for 2 minutes.
(Check code: E0)
E0
1 Abnormal if indoor controller board can
or
not receive any data normally from
E4
remote controller board or from other
indoor controller board for 3 minutes.
(Check code: E4)
2 Indoor controller board cannot receive
any signal from remote controller for 2
minutes. (Check code: E4)
OCH640C
1 Defective thermistor
characteristics
2 Contact failure of connector
(CN44) on the indoor controller
board (Insert failure)
3 Breaking of wire or contact
failure of thermistor wiring
4 Temperature of thermistor is
194°F [90:
defective refrigerant circuit.
5 Defective indoor controller
:] or less
board
:]
1 Drain pump trouble
2 Drain defective
• Drain pump clogging
• Drain pipe clogging
3 Open circuit of float switch
4 Contact failure of float switch connector
5 Dew condensation on float switch
• Drain water trickles down
lead wire.
for a total of
• Drain water ripples due to
filter clogging.
6 Extension piping connection difference
at twin, triple or quadruple system
7 Miswiring of indoor/outdoor connecting
at twin, triple or quadruple system
8 Room temperature thermistor/
liquid pipe temperature thermis-
tor detection is defective.
1 Contact failure at transmission
wire of remote controller
2 All remote controllers are set as
"sub" remote controller. In this
case, E0 is displayed on remote
controller, and E4 is displayed
at LED (LED1, LED2) on the
outdoor controller circuit board.
3 Miswiring of remote controller
4 Defective transmitting receiving
circuit of remote controller
5 Defective transmitting receiving
circuit of indoor controller board
of refrigerant addresses "0".
6 Noise has entered into the
transmission wire of remote
controller.
Cause
1–3 Check resistance value of thermistor.
2 Check contact failure of connector (CN44)
4 Operate in test run mode and check pipe
:] or less caused by
5 Operate in test run mode and check pipe
(
Turn the power off and on again to operate.
In case of checking pipe temperature with outdoor
controller circuit board, be sure to
connect A-control service tool (PAC-SK52ST).
1 Check the drain pump.
2 Check whether water can be drained.
3 Check the resistance of the float switch.
4 Check the connector contact failure.
5 Check the float switch lead wire mounted.
6 Check the piping connection.
7 Check the indoor/outdoor connecting wires.
8 Check the room temperature display of
1 Check disconnection or looseness of indoor unit or
2 Set one of the remote controllers "main"
3 Check wiring of remote controller.
If the cause of trouble is not in above 1–3,
4 Diagnose remote controllers.
Note: If the unit is not normal after replacing
24
Countermeasure
For characteristics, refer to (P1).
on the indoor controller board.
Refer to "9-7. TEST POINT DIAGRAM".
Turn the power on and check restart
after inserting connector again.
<condenser/evaporator> temperature with
outdoor controller circuit board. If pipe
<condenser/evaporator> temperature is
extremely low (in cooling mode) or high (in
heating mode), refrigerant circuit may have
defect.
<condenser/evaporator> temperature with
outdoor control circuit board. If there is
extreme difference with actual pipe
<condenser/evaporator> temperature,
replace indoor controller board.
There is no abnormality if none of above
comes within the unit.
Check the filter clogging.
remote controller.
Check the indoor liquid pipe temperature
display of outdoor controller board.
transmission wire of remote controller.
if there is no problem with the action above.
• Total wiring length: max. 500 m
(Do not use cable x with 3 cores or more.)
• The number of connecting indoor units:
max. 16 units
• The number of connecting remote con-
troller: max. 2 units
a) When "RC OK" is displayed,
Remote controllers have no problem.
Turn the power off, and on again to
check. If abnormality generates again,
replace indoor controller board.
b) When "RC NG" is displayed,
Replace remote controller.
c) When "RC E3" or "ERC 00-66" is dis-
played, noise may be causing abnormality.
indoor controller board in group control,
indoor controller board of address "0"
may be abnormal.
(
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