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Troubleshooting - Mitsubishi Electric PLH-2 Installation Manual

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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.)
(1) Wrong indoor-outdoor connections, or a re-
verse phase in the power line to the outdoor
(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.
One-to-one system
In cooling mode, indoor coil temperature code
does not change.
The remote controller display temporarily
operation is started, but disappears soon af-
terward. (The same symptom appears if there
is a short circuit in the remote controller wir-
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-
Nothing is displayed on the remote control-
"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
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.


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