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Check Code
Abnormal point and detection method
Remote controller transmission error
(E0)/signal receiving error (E4)
1 Abnormal if main or sub remote
controller cannot receive any
transmission normally from Interface
unit/Flow temp. controller 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)
1 Abnormal if Interface/Flow temp.
E0
controller board cannot receive any
or
data normally from remote controller
E4
board or from other Interface/Flow temp.
controller board for 3 minutes. (Check
code: E4)
2 Interface/Flow temp. controller board
cannot receive any signal from remote
controller for 2 minutes. (Check code:
E4)
Remote controller control board
1 Abnormal if data cannot be read nor-
mally from the nonvolatile memory of
the remote controller control board.
E1
(Check code: E1)
or
2 Abnormal if the clock function of remote
E2
controller cannot be operated normally.
(Check code: E2)
Remote controller transmission error
(E3)/signal receiving error (E5)
1 Abnormal if remote controller could not
find blank of transmission path for 6 sec-
onds and could not transmit.
(Check code: E3)
2 When remote controller receives the
transmitted data same time and com-
pares these data. Abnormal if the data is
judged to be different for 30 continuous
E3
times. (Check code: E3)
or
E5
1 Abnormal if Interface/Flow temp. control-
ler board could not find blank of transmis-
sion path. (Check code: E5)
2 When Interface/Flow temp. controller
receives the transmitted data same time
and compares these data. Abnormal if
the data is judged to be different for 30
continuous times. (Check code: E5)
Interface unit/Flow temp. controller-out-
door unit communication error (Signal
receiving error)
1 Abnormal if Interface/Flow temp.
controller board cannot receive any
signal normally for 6 minutes after
turning the power on.
E6
2 Abnormal if Interface/Flow temp.
controller board cannot receive any
signal normally for 3 minutes.
OCH605A
Case
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 control-
ler circuit board.
3 Miswiring of remote controller
4 Defective transmitting receiv-
ing circuit of remote controller
5 Noise has entered into the
transmission wire of remote
controller.
1 Defective remote controller
1 Refer to the indoor unit's
Installation Manual for remote
controller connection.
2 Defective transmitting receiv-
ing circuit of remote controller
3 Defective transmitting receiv-
ing circuit of Interface/Flow
temp. controller board
4 Noise has entered into trans-
mission wire of remote con-
troller.
1 Contact failure, short circuit or,
miswiring (converse wiring) of
Interface unit/Flow temp. con-
troller-outdoor unit connecting
wire
2 Defective transmitting receiving
circuit of Interface/Flow temp.
controller board
3 Defective transmitting receiv-
ing circuit of Interface/Flow
temp. controller board
4 Noise has entered into Interface
unit/Flow temp. controller-
outdoor unit connecting wire.
20
Judgment and action
1 Check disconnection or looseness of
Interface unit/Flow temp. controller unit or
transmission wire of remote controller.
2 Set one of the remote controllers "main", If
there is no problem with the action above.
3 Check wiring of remote controller.
• Total wiring length: max. 500 m
(Do not use cable × 3 or more.)
• The number of connecting remote controller
(Refer to the indoor unit's Installation Manual.)
If the cause of trouble is not in 1–3 above,
4 Diagnose remote controllers.
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
Interface/Flow temp. controller board.
b) When "RC NG" is displayed, replace remote
controller.
c) When "RC E3" or "ERC 00–66" is displayed,
noise may be causing abnormality.
1 Replace remote controller.
1 Refer to the indoor unit's Installation Manual
for remote controller connection.
2–4 Diagnose remote controller.
a) When "RC OK" is displayed, remote
controllers have no problem.
Turn the power off, and on again to
check.
When becoming abnormal 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 abnor-
mality.
Note: Check LED display on the outdoor
controller circuit board. (Connect
A-control service tool, PAC-SK52ST.)
1 Check disconnection or looseness of
Interface unit/Flow temp. controller-outdoor
unit connecting wire of Interface unit/Flow
temp. controller or outdoor unit.
2–4 Turn the power off, and on again to
check. If abnormality generates again,
replace Interface/Flow temp. controller
board or outdoor controller circuit board.
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