Mitsubishi Electric SLZ Series Technical & Service Manual page 18

Abnormal point and detection method
Check code
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 different
E3
data to be abnormal 30 continuous times.
or (Check code: E3)
E5
1 Abnormal if indoor controller board could
(6832
not find blank of transmission path.
or
(Check code: E5)
6833)
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 cannot
receive any signal normally for 6 minutes
after turning the power on.
2 Abnormal if indoor controller board cannot
receive any signal normally for 3 minutes.
Consider the unit abnormal under the
E6
following condition: When 2 or more
indoor units are connected to one outdoor
unit, indoor controller board cannot
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
times continuously though indoor controller
E7 board has transmitted "0".
Indoor controller board
Abnormal if data cannot be normally read
from the nonvolatile memory of the indoor
FB(Fb)
controller board.
Remote controller control board
1 Abnormal if data cannot be normally
read from the nonvolatile memory of the
E1
remote controller control board.
or
(Check code: E1)
E2
(6201
2 Abnormal if the clock function of remote
or
controller cannot be normally operated.
6202)
(Check code: E2)
TCH118
Cause
1 2 remote controllers are set as
"main."
(In case of 2 remote controllers)
2 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 transmis-
sion 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 indoor controller board
Defective transmitting/receiving
circuit of indoor controller board
Noise has entered into indoor/
outdoor unit connecting wire.
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 Defective indoor controller board 1 Replace indoor controller board.
1 Defective remote controller
18
Countermeasure
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.
– Diagnose remote controller.
a) When "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 "NG" is displayed, replace remote
controller.
c) When "E3" or "ERC" is displayed, noise may
be causing abnormality.
1 Check disconnection or looseness of indoor/
outdoor unit connecting wire of indoor unit or
outdoor unit.
Check all the units in case of twin indoor unit
system.
2–4Turn 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 case of twin indoor unit system.
1–3 Turn the power off, and on again to
check. If abnormality generates again,
replace indoor controller board.
*The check code in the parenthesis indicates
PAR-41MAA model.
1 Replace remote controller.