Mitsubishi Electric Mr Slim PUHZ-RP50VHA4 Service Manual page 55

Error Code Abnormal points and detection method
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
E3
data, and when detecting it, judges
or
different data to be abnormal 30
E5
continuous times. (Error code: E3)
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 could
not receive any signal normally for 6
minutes after turning the power on.
2 Abnormal if indoor controller board could
not receive any signal normally for 3
minutes.
3 Consider the unit as abnormal under
the following condition. When 2 or more
indoor units are connected to an outdoor
E6
unit, indoor controller board could not
(6840)
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/outdoor unit communication
error (Signal receiving error)
(Outdoor unit)
E8
Abnormal if outdoor controller circuit board
(6840)
could not receive anything normally for 3
minutes.
Indoor/outdoor unit communication
error (Transmitting error) (Outdoor unit)
1 Abnormal if "0" receiving is detected 30
E9
times continuously though outdoor con-
(6841)
troller circuit board has transmitted "1".
2 Abnormal if outdoor controller circuit
board could not find blank of transmis-
sion path for 3 minutes.
OCH451D
Case
1 2 remote controller are set as
"main."
(When connecting 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 outdoor controller
circuit board.
3 Defective transmitting receiving
circuit of indoor controller
board.
4 Noise has entered into indoor/
outdoor unit connecting wire.
5 Defective fan motor
6 Defective rush current resistor
of outdoor power circuit board
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 Contact failure of indoor/
outdoor unit connecting wire
2 Defective communication circuit
of outdoor controller circuit
board
3 Defective communication circuit
of indoor controller board
4 Noise has entered into indoor/
outdoor unit connecting wire.
1 Indoor/ outdoor unit connecting
wire has contact failure.
2 Defective communication cir-
cuit of outdoor controller circuit
board
3 Noise has entered power supply.
4 Noise has entered indoor/ out-
door unit connecting wire.
55
Judgment and action
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 outdoor controller
circuit board. (Connect A-Control service tool
(PAC-SK52ST))
Refer to EA~EC item if LED displays EA~AC.
1 Check disconnecting or looseness of indoor
/outdoor unit connecting wire of indoor unit
or outdoor unit.
Check all the units in case of twin/triple/
quadruple 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/quadruple indoor unit
system.
5 Turn the power off, and detach fan motor
from connector (CNF1, 2). Then turn the
power on again.
If abnormality is not displayed, replace fan
motor.
If abnormality is displayed, replace outdoor
controller circuit board.
6 Check the rush current resistor on outdoor
power circuit board with tester. If open is
detected, replace the power circuit board.
1-3 Turn the power off, and on again to check.
If abnormality generates again, replace
indoor controller board.
1 Check disconnection or looseness of indoor/
outdoor unit connecting wire of indoor or
outdoor units.
2~4 Turn the power off, and on again to
check. Replace indoor controller board
or outdoor controller circuit board if
abnormality is displayed again.
1 Check disconnection or looseness of indoor/
outdoor unit connecting wire.
2~4 Turn the power off, and on again to
check. Replace outdoor controller circuit
board if abnormality is displayed again.