Mitsubishi Electric PUZ-SM100VKA2 Service Manual page 36

Check code
Abnormal points and detection method
Remote controller transmission error
(E3)/signal receiving error (E5)
Abnormal if remote controller could not
find blank of transmission path for 6
seconds and could not transmit.
(Check code: E3)
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. (Check code: E3)
Abnormal if indoor controller board could
not find blank of transmission path.
(Check code: E5)
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. (Check code: E5)
Indoor/outdoor unit communication
error (Signal receiving error)
Abnormal if indoor controller board could
not receive any signal normally for 6
minutes after turning the power on.
Abnormal if indoor controller board could
not receive any signal normally for 3
minutes.
Consider the unit as abnormal under
the following condition. When 2 or more
indoor units are connected to an outdoor
unit, indoor controller board could not
E6
receive a signal for 3 minutes from
(6840)
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)
Abnormal if "0" receiving is detected 30
E9
times continuously though outdoor con-
(6841)
troller circuit board has transmitted "1".
Abnormal if outdoor controller circuit
board could not find blank of transmission
path for 3 minutes.
OCH774A
Cause
2 remote controller are set as
"main."
(In case of 2 remote controllers)
Remote controller is connected
with 2 indoor units or more.
Repetition of refrigerant
address
Defective transmitting receiving
circuit of remote controller
Defective transmitting receiving
circuit of indoor controller board
Noise has entered into
transmission wire of remote
controller.
Contact failure, short circuit or
miswiring (reverse wiring) of
indoor/outdoor unit connecting
wire
Defective transmitting receiving
circuit of outdoor controller
circuit board
Defective transmitting receiving
circuit of indoor controller board
Noise has entered into indoor/
outdoor unit connecting wire.
Defective fan motor
Disconnection of 52C relay
(PUZ-SM·VKA2)
Defective transmitting receiving
circuit of indoor controller board
Noise has entered into power
supply.
Noise has entered into outdoor
control wire.
Contact failure of indoor/
outdoor unit connecting wire
Defective communication circuit
of outdoor controller circuit board
Defective communication circuit
of indoor controller board
Noise has entered into indoor/
outdoor unit connecting wire.
Indoor/ outdoor unit connecting
wire has contact failure.
Defective communication circuit
of outdoor controller circuit board
Noise has entered power supply.
Noise has entered indoor/ out-
door unit connecting wire.
36
Judgment and action
Set a remote controller to main, and the
other to sub.
Remote controller is connected with only one
indoor unit.
The address changes to a separate setting.
– 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.
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.
– Turn the power off, and on again to check.
If abnormality occurs 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.
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.
Connect 52C relay properly to CN52C
(PUZ-SM·VKA2)
– Turn the power off, and on again to check.
If abnormality occurs again, replace indoor
controller board.
Check disconnection or looseness of indoor/
outdoor unit connecting wire of indoor or
outdoor units.
– Turn the power off, and on again to
check. Replace indoor controller board
or outdoor controller circuit board if
abnormality is displayed again.
Check disconnection or looseness of indoor/
outdoor unit connecting wire.
– Turn the power off, and on again to
check. Replace outdoor controller circuit
board if abnormality is displayed again.