Mitsubishi Electric Lossnay LGH-50RVS-E Handbook page 32

Error LED1 LED2
Code (green) (red)
6603 5 Transmission
blinks error
(transmission
bus busy)
6606 3 Transmission/
blinks reception error
(communica-
tion error with
transmission
processor)
6607 8 Transmission/
blinks reception error
(no ACK error)
6608 8 Transmission/
blinks reception error
(no response
error)
*1 This refers to devices assigned an address number in MELANS such as the Lossnay unit, City Multi indoor
unit, City Multi outdoor unit, or system controller.
Symptom
Faulty connection of the M-NET
transmission cable
Wiring was performed with power
•
still supplied to the M-NET trans-
mission cable.
Accidental communication error
•
Power is supplied to the same trans-
mission cable from two or more
power supply units.
The power supply unit is connected
to the TB3 terminal of the transmis-
sion booster.
PZ-62DR-E is connected to the ter-
minals (TB5 [A] [B]).
Malfunction of the unit (*1) where an
error occurs
Faulty connection of the M-NET
transmission cable
Wiring was performed with power
•
still supplied to the M-NET trans-
mission cable.
Accidental communication error
•
Malfunction of the unit (*1) where an
error occurs
The power of the Lossnay unit is not ON. Check the power of the Lossnay unit.
The Lossnay address was changed. Check the Lossnay address.
PZ-62DR-E is connected to the ter-
minals (TB5 [A] [B]).
Multiple M-NET transmission cables
are wired using multicore cables.
The M-NET transmission cable is not
securely connected.
The wiring length of the M-NET trans-
mission cable is longer than specified.
• Max. extension: 200 m
• Total extension: 500 m
PZ-62DR-E is connected to the ter-
minals (TB5 [A] [B]).
Cause
─ 32 ─
Corrective action
Check the items described in (1)
[2].
Restart the system after complet-
ing wiring.
If the error re-occurs, check for
noise on the transmission cable.
If the above does not correct the
problem, replace the Lossnay con-
trol circuit board.
Check the wiring of the power
supply unit and the transmission
booster.
Connect PZ-62DR-E to the termi-
nals (TM4 [1] [2]). (See the Lossnay
Operating/Installation Instructions or
PZ-62DR-E Instruction Book.)
Check the unit (*1) where the error
occurs.
Check the items described in (1)
[2].
Restart the system after complet-
ing wiring.
If the error re-occurs, check for
noise on the transmission cable.
If the above does not correct the
problem, replace the Lossnay con-
trol circuit board.
Check the unit (*1) where the error
occurs.
Connect PZ-62DR-E to the termi-
nals (TM4 [1] [2]). (See the Lossnay
Operating/Installation Instructions or
PZ-62DR-E Instruction Book.)
Using the applicable cable, wire
the transmission cable away from
one another.
Check the transmission cable
connections.
Check the wiring length of the
transmission cable.
Connect PZ-62DR-E to the termi-
nals (TM4 [1] [2]). (See the Lossnay
Operating/Installation Instructions or
PZ-62DR-E Instruction Book.)