Mitsubishi Electric PU-P71VHA Service Manual page 42

Problem
The unit started even though the
start/stop button was not pushed.
The unit stopped even though the
start/stop button was not pushed.
The remote controller`s timer can-
not be set.
"PLEASE WAIT" is displayed in
the remote controller.
"FILTER" is displayed.
"STAND BY" is displayed.
Solution
Is this timer on?
Press the start/stop button to stop
the unit.
Was a distant commend sent from
the remote controller?
Find out if the remote controller
was used.
Is the CENTRALLY CON-
TROLLED indicator displayed?
Find out if the remote controller
was used.
Is the automatic (cooling/heating)
mode selected?
Press the start/ stop button to stop
the unit.
Is the timer on?
Press the start/stop button to
restart the unit.
Was a distant command sent from
the remote controller?
Find out if the remote controller
was used.
Is the CENTRALLY CON-
TROLLED indicator displayed?
Find out if the remote controller
was used.
Set the schedule timer if one is
connected.
An automatic startup test is being
performed (will last for about two
minutes).
Indicates that it is time to clean the
air filter. Clean the air filter. Press
the FILTER button on the remote
controller twice to make the dis-
play disappear.
See the instruction manual that
came with the product for how to
clean the filter.
Displayed when the unit starts
HEAT operation, when the air con-
ditioning function puts the com-
pressor in operation mode, or
when the outdoor unit ends
DEFROST operation and returns
to HEAT operation. The display
disappears after about 10 minutes.
"STAND BY" displayed on the
remote controller indicates that the
indoor unit's heat exchanger hasn't
fully heated up, so the blower air
volume is restricted. To prevent
cold air from being felt at this time,
the up/down vane is automatically
set to horizontal blow. When
"STAND BY" is released, the
up/down vane returns to the set-
ting specified by the remote con-
troller.
Problem
"DEFROST" is displayed (no air
comes out the unit).
An error code is displayed in the
remote controller.
No display appears on the wire-
less remote controller. Signals are
not received by the thin sensor
unless sent from close up.
The operating display of the wire-
less remote controller`s receiver is
flashing.
42
Solution
Frost adheres to the outdoor unit
when the outside air temperature
is low and the humidity is high.
This display indicates that the
DEFROST operation is being per-
formed to melt this frost. The
DEFROST operation ends after
about 10 minutes (15 minutes
maximum).
During the DEFROST operation,
the indoor unit's heat exchanger
becomes cold, so the blower is
stopped. The up/down vane is
automatically set to horizontal
blow. When the DEFROST opera-
tion ends, the unit switches to the
HEAT SETUP operation.
A self-diagnostic function is being
performed to preserve the air con-
ditioner.
* Do not attempt to make repairs
yourself. Turn the main switch off
and contact the dealer from
whom you bought the air condi-
tioner. Provide him or her with
the name of the unit and the
information displayed in the
remote controller.
The batteries are becoming weak.
Replace the batteries and press
the reset button.
* If the display does not appear
after replacing the batteries,
make sure that the (+,–) cells are
aligned correctly.
A self-diagnostic function is being
performed to preserve the air con-
ditioner.
* Do not attempt to make repairs
yourself. Turn the main switch off
and contact the dealer from
whom you bough the air condi-
tioner. Provide him or her with
the name of the unit.