Symptom Cause Checking method & countermeasure
[Generates at registration and confirmation]
1) Erroneous address of unit to be coupled
2)Slipping off of transmission line of unit to be
coupled (No connection)
3) Faulty circuit board of unit to be coupled
4) Installation miss of transmission line
[Confirmation of different refrigerant system con-
troller]
5) Breaking of power source of outdoor unit to be
confirmed
6) Slipping off of centralized control transmission
line (TB7) of outdoor unit
7) Power supply connector (CN40) is not inserted
into centralized control transmission line in
grouping with different refrigerant system with-
out using MELANS
8)More than 2 sets of power supply connector
are inserted into the centralized control trans-
mission line of outdoor unit
9) In the system connected with MELANS, power
supply connector (CN40) is inserted into the
centralized control transmission line of outdoor
unit.
10) Short circuit of centralized control transmission
line
a) Confirm the address of unit to be coupled.
b) Check the connection of transmission line.
c) Check the transmission terminal block voltage
of unit to be coupled
i) Normal if voltage is DC17 ~ 30V
ii) Check the item d) in case other than i).
d) Confirm the power source of outdoor unit to be
coupled with the unit to be confirmed
e) Confirm that the centralized control transmis-
sion line (TB7) of outdoor unit is not slipped off.
f) Confirm the voltage of centralized control trans-
mission line.
i) Normal in case of 10V ~ 30V
ii) Check the items 7) ~ 10) left in case that
other than i).
“88” appears on re-
mote controller at the
registration and
access
remote controller
4
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52-