Mitsubishi Electric Mr. SLIM MSZ-FA25VA Technical Manual página 765

Meaning of error code and detection method
Error Code
Indoor/outdoor unit communication
error (Signal receiving error)
1 Abnormal if indoor controller board
cannot receive any signal normally for
six minutes after putting the power on.
2 Abnormal if indoor controller board
cannot receive any signal normally for
three minutes.
E6
3 Consider the unit abnormal under the
following condition: When two or more
indoor units are connected to one
outdoor unit, indoor controller board
cannot receive a signal for three 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".
Abnormality of indoor controller board
Abnormal if data cannot be normally read
Fb
from the nonvolatile memory of the indoor
controller board.
Cause
1 Contact failure, short circuit or,
mis-wiring (converse wiring) of
indoor/outdoor unit connecting
wire
2 Defective transmitting receiving
circuit of indoor controller board
3 Defective transmitting receiving
circuit of indoor controller board
4 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.
Resolución de averías
Countermeasure
∗ Check LED display on the outdoor control cir-
cuit board. (Connect A-control service tool,
PAC-SK52ST.)
Refer to EA-EC item if LED displays EA-EC.
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 triple
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.
∗ Other indoor controller board may have
defective in case of twin triple indoor unit
system.
1 -3 Turn the power off, and on again to check.
If abnormality generates again, replace
indoor controller board.
1 Replace indoor controller board.
765