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Transmission processor hardware
error
Transmission circuit bus-busy er-
ror
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.
Checking method and processing
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.
Checking
code
6602
6603
Meaning, detecting method Cause Checking method & Countermeasure
Transmission line
installed while turning
power source on?
Check power source of indoor
unit.
220V ~ 240V?
Shut off the power source of outdoor/in-
door units/BC controller and make it again.
Erroneous power
source work
Erroneous transmis-
sion work
Check transmission line
work and shield finish
Ground fault or shield
contacted with transmission
line?
System composition?
Single refrigerant
system
Investigation of trans-
mission line noise
Modification of
faulty point
Replace insertion
of CN40 to CN41
CN40 inserted?
Confirm supply power
connector CN40 of outdoor unit
MELANS connected
system
Investigation of the
cause of noise
* For the investigation method, follow <Investiga-
tion method of transmission wave shape/noise>
Modification of CN40
insertion method.
Only 1 set with
CN40 inserted?
Noise exist?
Faulty controller of
generating unit
Plural refrigerant
system
Confirm supply power
connector CN40 of outdoor unit
NO
YES
YES
YES
NO
NO
YES
NO
YES
NO
YES