Table of Contents
Phenomena
4
"88" appears on remote
controller at registration and
access remote controller.
Factors
(Generates at registration and
confirmation)
(1) Erroneous address of unit to be
coupled.
(2) Disconnection 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.
(Generates at interlocking registration
between LOSSNAY and the indoor unit)
(5) The power of LOSSNAY is OFF.
(Confirmation of different refrigerant
system controller)
(6) Disconnection of power source of
outdoor unit to be confirmed.
(7) Disconnection of centralized control
transmission line (TB7) of outdoor
unit.
(8) Power supply connector (CN40) is
not inserted into centralized control
transmission line in grouping with
different refrigerant system without
using MELANS.
(9) More than 2 sets of power supply
connector are inserted into the
centralized control transmission
line of outdoor unit.
(10) In the system connected with
MELANS, power supply connector
(CN40) is inserted into the
centralized control transmission
line of outdoor unit.
(11) Short circuit of centralized control
transmission line.
- 155 -
Checke method & Handling
(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) Check for the main power of
LOSSNAY.
(e) Confirm the power source of
outdoor unit to be coupled with the
unit to be confirmed.
(f) Confirm that the centralized control
transmission line (TB7) of outdoor
unit is not disconnection.
(g) Confirm the voltage of centralized
control transmission line.
i) Normal in case of 10V ~ 30V.
ii) Check the items (8) ~ (11) left in
case other than i).
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Troubleshooting
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