Installation manual

30
E
9. Troubleshooting
If any of the above-mentioned functions do not work properly, search for the cause in the following chart and correct accordingly. (This troubleshooting
chart applies only to operation in trial run mode.)
Symptoms
One-to-one system
• In cooling mode, indoor coil temperature code
does not change.
• The remote controller display temporarily
shows “CENTRALLY CONTROLLED” when
operation is started, but disappears soon af-
terward. (The same symptom appears if there
is a short circuit in the remote controller wir-
ing.)
• The remote controller display shows “CEN-
TRALLY CONTROLLED”, but the switches fail
to work. (On shipping, the remote controller
and indoor unit are set to the address “0”. Ac-
cidental setting changes can cause this symp-
tom.)
• Nothing is displayed on the remote control-
ler.
• “P7” is shown sometimes.
Group control
• The same symptom as on the left appears
when the master unit (the unit to which the
remote controller is connected) is not correctly
wired.
• When any of the slave units are incorrectly
wired, the blower will not run, or nine to ten
minutes later, the system displays “P8” followed
by the slave unit number.
• The same symptom as on the left appears
when the master unit or remote controller has
a setting error.
• If there are overlapping slave addresses, the
system shows “P7” followed by the overlap-
ping unit number.
• The same as on the left
• The same as on the left
• Nothing is displayed on the remote controller.
Cause
(1) Wrong indoor-outdoor connections, or a re-
verse phase in the power line to the outdoor
unit
(2) Improper setting of the remote controller or
the indoor unit address
(3) Wrong connections or a short circuit in the
remote controller
(4) In a two-remote controller system, no setting
was made for the slave remote controller.
(DIPSW7 should be set to ON.)
(5) In group control, connector CN40 is still con-
nected in the slave units (No.1 and afterward).
• The above causes are attributable to improper installation. If the unit itself develops trouble, “P!8!” will be shown. In such cases consult the trouble-
shooting section of the Instruction Manual.
• If the equipment uses the optional central control system’s remote controller, program timer or other devices, also refer to the applicable section in the
Instruction Manual.
• Conduct the trial run as explained before, and confirm hat no condensation drips from the refrigerant or drain pipes.
• Confirm that air is not leaking from the opening between the unit and the grille, or between the grille and the ceiling. Air leakage may cause
condensation to drip.
• When the trial run is successfully completed, use the Instruction Manual to explain all the operation procedures to the customer.