Mitsubishi Electric LGH-F300RVX-E Handbook page 33

Error LED1 LED2
code (Green) (Red)
6603 5 Transmission
blinks error
(transmission
bus busy)
6606 3 Transmission/
blinks reception
error (com-
munication
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 transmis-
sion 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-61DR-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 transmis-
sion cable.
Accidental communication error
•
Malfunction of the unit (*1) where an
error occurs
The power of the Lossnay unit is not
ON.
The Lossnay address was changed. Check the Lossnay address.
PZ-61DR-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
transmission cable is longer than
specified. (Longer than 219 yd. (200
m) from the power supply unit, longer
than 547 yd. (500 m) in total length)
PZ-61DR-E is connected to the ter-
minals (TB5 [A] [B]).
Cause
─ 33 ─
Corrective action
Check the items described in (1) [2].
Restart the system after completing
wiring.
If the error re-occurs, check for
noise on the transmission cable.
If the above does not correct the
problem, replace the Lossnay circuit
board.
Check the wiring of the power
supply unit and the transmission
booster.
Connect PZ-61DR-E to the termi-
nals (TM4 [1] [2]).
(See the Lossnay technical manual.)
Check the unit (*1) where the error
occurs.
Check the items described in (1) [2].
Restart the system after completing
wiring.
If the error re-occurs, check for
noise on the transmission cable.
If the above does not correct the
problem, replace the Lossnay circuit
board.
Check the unit (*1) where the error
occurs.
Check the power of the Lossnay
unit.
Connect PZ-61DR-E to the termi-
nals (TM4 [1] [2]).
(See the Lossnay technical manual.)
Using the applicable cable, wire the
transmission cable away from one
another.
Check the transmission cable con-
nections.
Check the wiring length of the trans-
mission cable.
Connect PZ-61DR-E to the termi-
nals (TM4 [1] [2]).
(See the Lossnay technical manual.)