Mitsubishi Electric PEY Series Service Manual page 33

TROUBLESHOOTING
Error 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 normally any transmission
from indoor unit of refrigerant address "0"
for 3 minutes.
(Error code : E0)
2 Abnormal if sub remote controller could not
receive for any signal for 2 minutes. (Error
code: E0)
1 Abnormal if indoor controller board can not
receive any data normally from remote
E0
controller board or from other indoor
or
controller board for 3 minutes. (Error code:
E4
E4)
2 Indoor controller board cannot receive any
signal from remote controller for 2 minutes.
(Error code: E4)
Remote controller transmission error(E3)/
signal receiving error(E5)
1 Abnormal if remote controller could not find
blank of transmission path for 6 seconds
and could not transmit.
(Error code: E3)
2 Remote controller receives transmitted
data at the same time, compares the data,
and when detecting it, judges different data
E3
to be abnormal 30 continuous times. (Error
or
code: E3)
E5
1 Abnormal if indoor controller board could
not find blank of transmission path. (Error
code: E5)
2 Indoor controller board receives
transmitted data at the same time,
compares the data,and when detecting it,
judges different data to be abnormal 30
continuous times. (Error code: E5)
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.
E6 3 Consider the unit as 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/outdoor unit communication error
(Transmitting error)
Abnormal if "1" receiving is detected 30 times
continuously though indoor controller board
E7
has transmitted "0".
HWE1305A
Cause
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.
1 2 remote controllers are set as
"main."
(In case of 2 remote
controllers)
2 Remote controller is connected
with 2 indoor units or more.
3 Repetition of refrigerant
address
4 Defective transmitting receiving
circuit of remote controller
5 Defective transmitting receiving
circuit of indoor controller
board
6 Noise has entered into
transmission wire of remote
controller.
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.
1 Defective transmitting receiving
circuit of indoor controller
board
2 Noise has entered into power
supply.
3 Noise has entered into outdoor
control wire.
33
Countermeasure
1 Check disconnection or looseness of indoor
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. 500m (Do not use
cable × 3 or more.)
• The number of connecting indoor units:
max.16 units
• The number of connecting remote controller:
max. 2 units
When it is not the above-mentioned problem of
1~3
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 indoor
controller board.
b) When "RC NG" is displayed, Replace
remote controller.
c) When "RC E3" or "ERC 00-06" is displayed,
noise may be causing abnormality.
* If the unit is not normal after replacing indoor
controller board in group control, indoor
controller board of address "0" may be
abnormal.
1 Set a remote controller to main, and the
other to sub.
2 Remote controller is connected with only one
indoor unit.
3 The address changes to a separate setting.
4~6 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 displayed,
noise may be causing abnormality.
* 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.
* Other indoor controller board may have defect
in case of twin triple indoor unit system.
1-3 Turn the power off, and on again to
check. If abnormality generates again,
replace indoor controller board.