Mitsubishi Electric LGH-15RVX3-E Handbook page 36

Error LED1 LED2
Code (green) (red)
6602 2 Transmission
blinks error
(transmis-
sion proces-
sor hardware
error)
6603 5 Transmission
blinks error
(transmission
bus busy)
(*3) 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-EA/EB is connected to the
terminals (TB5 [A] [B]).
Malfunction of the unit (*3) 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
•
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-EA/EB is connected to the
terminals (TB5 [A] [B]).
Malfunction of the unit (*3) where an
error occurs
Cause
─ 36 ─
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-EA/EB to the
terminals (TM4 [1] [2]).
(See the Lossnay Operating/
Installation Instructions or
PZ-62DR-E Instruction Book.)
Check the unit (*3) 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 wiring of the power
supply unit and the transmission
booster.
Connect PZ-62DR-EA/EB to the
terminals (TM4 [1] [2]).
(See the Lossnay Operating/
Installation Instructions or
PZ-62DR-E Instruction Book.)
Check the unit (*3) where the error
occurs.