Service Manual

─ 36 ─
Error
Code
LED1
(green)
LED2
(red)
Symptom Cause Corrective action
6602
2
blinks
Transmission
error
(transmis-
sion proces-
sor hardware
error)
Faulty connection of the M-NET
transmission cable
Check the items described in (1)
[2].
• Wiring was performed with power
still supplied to the M-NET trans-
mission cable.
• Accidental communication error
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.
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.
Check the wiring of the power
supply unit and the transmission
booster.
PZ-62DR-EA is connected to the ter-
minals (TB5 [A] [B]).
Connect PZ-62DR-EA to the termi-
nals (TM4 [1] [2]).
(See the Lossnay Operating/
Installation Instructions or
PZ-62DR-E Instruction Book.)
Malfunction of the unit (*3) where an
error occurs
Check the unit (*3) where the error
occurs.
6603
5
blinks
Transmission
error
(transmission
bus busy)
Faulty connection of the M-NET
transmission cable
Check the items described in (1)
[2].
• Wiring was performed with power
still supplied to the M-NET trans-
mission cable.
• Accidental communication error
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.
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.
Check the wiring of the power
supply unit and the transmission
booster.
PZ-62DR-EA is connected to the ter-
minals (TB5 [A] [B]).
Connect PZ-62DR-EA to the termi-
nals (TM4 [1] [2]).
(See the Lossnay
Operating/Installation Instructions or
PZ-62DR-E Instruction Book.)
Malfunction of the unit (*3) where an
error occurs
Check the unit (*3) where the error
occurs.
(*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.