- 138 -
Checking
code
Meaning, detecting method
Cause
Checking method & Countermeasure
Checking method and processing
NO
YES
YES
YES
NO
NO
NO
YES
NO
YES
NO
YES
Transmission line
installed while turning
power source on?
Ground fault or
shield contacted with
transmission line?
Shut off the power source of outdoor/
indoor units and make it again
Erroneous power
source work
Erroneous transmis-
sion work
Check power source of indoor unit.
220V ~ 240V ?
System composition?
Check transmission line
work and shield
Single refrigerant
system
Investigation of trans-
mission line noise
Faulty controller of
generating unit
Noise exist?
Investigation of the
cause of noise
Plural refrigerant
system
Confirm supply power con-
nector CN40 of outdoor unit
CN40 inserted?
Replace insertion of
CN40 to CN41
Modification of
faulty point
Only 1 set with
CN40 inserted?
Modification of CN40
insertion method.
System with the power supply
unit for transmission line
✻
For the investigation method, follow <Investiga-
tion method of transmission wave shape/noise>
6603
(1) As the voltage of short
frequency like noise is mixed
in transmission line
continuously, transmission
processor can not transmit.
(2) Faulty controller of
generating unit.
(a) Check transmission wave
shape/noise on trans-mission line
by following <Investigation method
of transmission wave shape/noise>.
→
No noise indicates faulty
controller of generat-ing unit.
→
Noise if existed, check the noise.
Transmission circuit bus-busy
abnormality
1. Collision of data transmission:
Transmission can not be per-
formed for 4~10 consecutive
minutes due to collision of data
transmission.
2. Data can not be transmitted on
transmission line due to noise for
4~10 consecutive minutes.
Note:
The address/attribute shown on
remote controller indicates the
controller which has detected error.
Confirm supply power con-
nector CN40 of outdoor unit
6602
(1) At the collision of mutual transmission data generated during the wiring
work or polarity change of the transmission line of indoor or outdoor
unit while turning the power source on, the wave shape is changed and
the error is detected.
(2) Ground fault of transmission line.
(3) Insertion of power supply connector (CN40) of plural outdoor units at
the grouping of plural refrigerant systems.
(4) Insertion of power supply connector (CN40) of plural outdoor units in
the connection system with MELANS.
(5) When using the power supply unit for transmission line in the connected
system with MELANS, the power supply connector (CN40) of the
outdoor unit is inserted into the transmission line.
(6) Faulty controller of unit in trouble.
(7) Change of transmission data due to the noise in transmission.
(8) Connection system with plural refrigerant systems or MELANS for
which voltage is not applied on the transmission line for central control.
Transmission processor hardware
abnormality
Though transmission processor
intends to transmit “0”, “1” is dis-
played on transmission line.
Note:
The address/attribute shown on
remote controller indicates the
controller which has detected
error.
