Mitsubishi Electric AE-200A Service Handbook page 57

[V Troubleshooting]
Error Description and method
code of detection
Communication error -
Address duplicate
Error detected when
units with the same
address are
transmitting.
6600
Communication error -
Polarity unsettled
1. Error detected
when the
transmission
processor which is
an M-NET
communication
component cannot
verify the + and -
voltage polarity of
the M-NET
transmission line.
6601
2. Detected invalid
signal due to a
transmission
waveform error or
noise on the
M-NET
transmission line.
3. Polarity not set error 9)
Cause
1) There are two more units with the same
address among the
AE-200/AE-50/EW-50, outdoor units,
indoor units, LOSSNAY, M-NET
remote controllers, and other units.
2) Two or more AE-200/AE-50/EW-50
with the same address set are installed
in the same transmission line system.
<Example> The part in ( ) indicates the
detection source.
000-6600(000)
There are two or more controllers with
the address "000".
3) The transmitted data changed due to
noise during transmission.
4) While AE-200 M-NET is set to [Do not
use], the power jumper (CN21) of the
AE-200 was removed.
1) There is no voltage between the M-NET
transmission line connected to the
AE-200/AE-50/EW-50.
2) The M-NET transmission line
connected to the AE-200/AE-50/EW-50
is shorted.
3) The M-NET power supply is duplex
feeding and has a different polarity
connection.
CN21
4) Contact failure of the transmission line
of an outdoor unit or indoor unit.
5) Attenuation of the transmission
voltage/signal because the allowable
range for the transmission line wiring
has been exceeded.
・ Farthest end: Exceeds 200 m (656 ft)
・ Remote controller line: Exceeds 10 m
(32 ft)
However, there is no problem if the
portion where the remote controller line
exceeds 10 m (32 ft) is 1.25 mm
6) Attenuation of the transmission
voltage/signal because mismatch of
transmission line types
Wire diameter: Less than 1.25 mm
7) The M-NET power supply is duplex
feeding and has a same polarity
connection.
8) Failure of control board in the outdoor
unit
Defective AHC ADAPTER
53
Check procedure and remedy
Causes 1) and 2) Find the unit that has the same
address as the unit where the
error occurred.
If the same address could be verified, check
whether there are any mistakes with the wiring
and whether there are any mistakes with the
addresses in the system, and fix any mistakes
you find.
Turn off the power of the air-conditioning units,
controllers, and other equipment at the same
time, leave it off for at least 5 minutes, and then
turn it back on.
Cause 3) Check the transmission waveform and
noise on the transmission line. For the
check procedure, refer to "V [4] M-NET
transmission waveform and noise
check procedure."
Cause 4) Check the connection of the power
jumper of the AE-200. Be sure to
connect the power jumper even when
AE-200 M-NET is set to [Do not use].
Causes 1) and 2)
Check whether there is a voltage to the M-NET
transmission line of the AE-200/AE-50/EW-50
and fix any wiring work mistakes.
In the case of a system for which power is
supplied from the AE-200/AE-50/EW-50 to the
MN converter, check that the M-NET power
jumper (CN21) is connected.
Cause 3) Check whether power is being supplied
to the M-NET transmission line from
multiple equipment, and fix the power
supply configuration if it is incorrect.
Causes 4) to 8)
→ If you find the cause, fix the problem.
→ If you cannot find the cause, check the
transmission waveform and noise on the
transmission line.
Perform the check procedure in accordance
with "V [4] M-NET transmission waveform and
noise check procedure" and <Transmission
waveform and noise check procedure> in the
Service Handbook of the air-conditioning unit.
The part causing the error may be a different
2
. line than the one where the error was detected
so check all wiring in the same system.
2
Check the voltage and short circuit.
Replace the product.