Mitsubishi Electric PUZ-ZM100VKA.UK Service Manual page 43

Check Code Abnormal points and detection method
Remote controller control board
Abnormal if data cannot be normally read
from the nonvolatile memory of the remote
E1
controller control board. (Check code: E1)
or
Abnormal if the clock function of remote
E2
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 data to be
abnormal 30 continuous times. (Check code:
E3
E3)
or
Abnormal if indoor controller board could not
E5
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
E6
units are connected to an outdoor unit,
(6840)
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.
OCH654D
Cause
Defective remote controller
1 2 remote controller are set as
"main."
(In the 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 (reversed 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.
43
Judgment and action
Replace remote controller.
1 Set a remote controller to main, and the
other to sub.
2 Remote controller is connected with only 1
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 the case of twin/
triple/quadruple indoor unit system.
2–4 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.
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 occurs 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.