Mitsubishi Electric PUZ-ZM200YKA2-ET Service Manual page 47

Check Code Abnormal points and detection method
Remote controller control board
Abnormal if data cannot be normally
read from the nonvolatile memory of the
E1
remote controller control board. (Check
or
code: E1)
E2
Abnormal if the clock function of remote
controller cannot be normally operated.
(Check code: E2)
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 data,
and when detecting it, judges different
E3
data to be abnormal 30 continuous times.
or
(Check code: E3)
E5
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
E6
the following condition. When 2 or more
(6840)
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
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)
Abnormal if outdoor controller circuit board
E8
could not receive anything normally for 3
(6840)
minutes.
OCH771C
Cause
Defective remote controller
2 remote controller are set as
"main."
(In the 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 (reversed 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
Defective rush current resistor of
outdoor power circuit board
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.
47
Judgment and action
Replace remote controller.
Set a remote controller to main, and the
other to sub.
Remote controller is connected with only 1
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 the 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.
Note: Other indoor controller board may have
defect in the 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.
Check the rush current resistor on outdoor
power circuit board with tester. If open is
detected, replace the power circuit board.
– 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.