Mitsubishi Electric Mr.SLIM PU-P71VHA Service Manual page 42

Error Code Meaning of error code and detection method
Not defined error code
EF
This code is displayed when not defined
(6607
error code is received.
or
6608)
Serial communication error
Abnormal if communication between
outdoor controller circuit board and M-NET
board is not available.
Ed
(0403)
<M-NET communication error>
Error Code Meaning of error code and detection method
Address duplicate definition
This error is displayed when transmission
from the units of same address is detected.
Note) The address and attribute displayed
A0
at remote controller indicate the con-
(6600)
troller that detected abnormality.
Hard ware error of transmission P line
Transmission processor intended
to transmit "0", but "1" appeared on
transmission wire.
Note) The address and attribute display
at remote controller indicate the
A2
controller that detected abnormality.
(6602)
BUS BUSY
1. Over error by collision damage
Abnormal if transmitting is not possible
for 8-10 minutes continuously because
of collision of transmission.
2. Data could not reach transmission wire
for 8-10 minutes continuously because
of noise or etc.
Note) The address and attribute displayed
at remote controller indicate the
A3 controller that detected abnormality.
(6603)
Communication error with
communication P line
Defective communication between unit
processor and transmission processor
A6
Note) The address and attribute display
(6606)
at remote controller indicate the
controller that detected abnormality.
OC379F
Case
1 Noise has entered transmis-
sion wire of remote controller.
2 Noise has entered indoor/
outdoor unit connecting wire.
1 Breaking of wire or contact
failure of connector between
outdoor controller circuit board
and M-NET board
2 Contact failure of M-NET
board power supply line
3 Noise has entered into M-NET
transmission wire.
(Note) "Indoor unit" in the text indicates M-NET P.C. board in outdoor unit.
Case
1 There are two or more same
address of controller of out-
door unit, indoor unit, FRESH
MASTER, or LOSSNAY.
2 Noise has entered into trans-
mission signal and signal was
transformed.
1 Error is detected if waveform is
transformed when wiring works
of transmission wire of outdoor
unit, indoor unit, FRESH
MASTER or LOSSNAY are
done, or polarity is changed
with the power on and
transmission data collide each
other.
2 Defective transmitting receiving
circuit of transmission processor
3 Transmission data is changed
by the noise on transmission.
1 Transmission processor could
not transmit because short
cycle voltage of noise and
the like have entered into
transmission wire continuously.
2 Transmission quantity has
increased and transmission
is not possible because there
was wiring mistake of terminal
block for transmission wire
(TB3) and terminal block for
central control (TB7) in outdoor
unit.
3 Transmission are mixed with
others and occupation rate
on transmission wire rose
because of defective repeater
(a function to connector or
disconnect transmission of
control and central control
system) of outdoor unit, then
abnormality is detected.
1 Data of transmission processor
or unit processor is not
transmitted normally because
of accidental trouble such as
noise or thunder surge.
2 Address forwarding from unit
processor is not transmitted
normally because of defective
transmission processor
hardware.
42
Judgment and action
12 Turn the power off, and on again to check.
Replace indoor controller board or outdoor
controller board if abnormality is displayed
again.
1 Check disconnection, looseness, or breaking
of connection wire between outdoor
controller circuit board (CNMNT) and M-NET
board (CN5).
2 Check disconnection, looseness, or breaking
of connection wire between outdoor
controller circuit board (CNMNT) and
M-NET board (CND).
3 Check M-NET transmission wiring method.
Judgment and action
Search the unit with same address as
abnormality occurred. If the same address is
found, shut of the power supply of outdoor
unit and indoor unit and FRESH MASTER or
LOSSNAY at the same time for 2 minutes or
more after the address is corrected, and turn
the power on again.
Check transmission waveform or noise on
transmission wire.
1 If the works of transmission wire is done
with the power on, shut off the power supply
of outdoor unit and indoor unit and FRESH
MASTER or LOSSNAY at the same time for
2 minutes or more, and turn the power on
again.
2 Check transmission waveform or noise on
transmission wire.
1 Check if transmission wire of indoor unit,
FRESH MASTER, LOSSNAY, or remote
controller is not connected to terminal block
for central control (TB7) of outdoor unit.
2 Check if transmission wire of indoor unit,
FRESH MASTER or LOSSNAY is not
connected to terminal block for transmission
wire of outdoor unit.
3 Check if terminal block for transmission wire
(TB3) and terminal block for central control
(TB7) is not connected.
4 Check transmission waveform or noise on
transmission wire.
Turn off the power supply of outdoor unit
and indoor unit and FRESH MASTER or
LOSSNAY at the same time for 2 minutes or
more, and put the power on again. System
returns normally if abnormality was accidental
malfunction. If the same abnormality generates
again, abnormality-generated controller may be
defective.