Mitsubishi Electric PUHZ-ZRP35VKA2 Service Manual page 38

Check 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.
(Check code: E3)
2 Remote controller receives transmitted
data at the same time, compares the
data, and when detecting it, judges
E3
different data to be abnormal 30
or
continuous times. (Check code: E3)
E5
1 Abnormal if indoor controller board could
not find blank of transmission path.
(Check 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. (Check 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
unit, indoor controller board could not
receive a signal for 3 minutes from
outdoor controller circuit board, a signal
E6 which allows outdoor controller circuit
(6840) 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)
Abnormal if outdoor controller circuit board
E8
could not receive anything normally for 3
(6840)
minutes.
Indoor/outdoor unit communication
error (Transmitting error) (Outdoor unit)
1 Abnormal if "0" receiving is detected 30
times continuously though outdoor con-
E9
troller circuit board has transmitted "1".
(6841)
2 Abnormal if outdoor controller circuit
board could not find blank of transmission
path for 3 minutes.
OCH635A
Cause
1 2 remote controller 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 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 circuit of out-
door controller circuit board
3 Noise has entered power supply.
4 Noise has entered indoor/ outdoor
unit connecting wire.
38
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 to EC item if LED displays EA
to 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.
Note: Other indoor controller board may
have
defect in the 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 dis-
played again.