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Checking
code
Meaning, detecting method Cause Checking method & Countermeasure
6600
6602
Multiple address error
Transmission from units with
the same address is detected.
Note:
The address/attribute
shown on remote con-
troller indica tes the con-
troller which has de-
tected error.
At the genration of 6600 error, release the error
by remote controller (with stop key) and start
again.
a) If the error occures again within 5 minutes
→ Search for the unit which has the same ad-
dress with that of the source of the trouble.
When the same address is found, turn off
the power source of outdoor unit, and in-
door unit for 5 minutes or more after modify-
ing the address, and then turn on it again.
b) When no trouble is generated even continuing
operation over 5 minutes
→ The transmission wave shape/noise on the
transmission line should be investigated in
accordance with <Investigation method of
transmission wave shape/noise>.
1) Two or more controllers of out-
door unit, indoor unit, remote con-
troller, etc. have the same ad-
dress.
2) In the case that signal has
changed due to noise entered into
the transmission signal.
(2) Communication/system
Transmission processor
hardware error
Though transmission proces-
sor intends to transmit "0", "1"
is displayed on transmission
line.
Note:
The address/attribute
shown on remote con-
troller indicates the con-
trol
ler which has detected
error.
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) 100V power source connection to indoor unit.
3) Ground fault of transmission line.
4) Insertion of power supply connector (CN40) of plural outdoor units at the grouping of
plural refrigerant systems.
5) Insertion of power supply connector (CN40) of plural outdoor units in the connection
system with MELANS.
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.
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