Mitsubishi Electric FRESH MASTER GUF-50RD4 Handbook page 13

State of machine Remote controller
Does not operate. The power display
"
appear on the
remote controller
when power is
supplied to the
system. (When
PAR-F27MEA is
used)
Cool air or warm The LCD screen
air does not come shows that it is in
out. operation.
It runs briefly, but
The
soon stops. check code flash-
es on the LCD
screen.
Does not humidify.
(GUF-50/100RDH
4
types only)
Dry mode cannot
be set from the
remote controller.
Dry mode can be Dry mode display
set from the cen- is flashing in LCD.
tral controller, but
does not operate.
When a power supply unit is used:
1 The power supply unit is not con-
" does not
nected with the transmission cable.
2 The power supply unit is not
turned on.
3 The length of the M-NET transmis-
sion cable wiring from the power
supply unit is longer than specified
(longer than 200 m).
The transmission cable power supply
restrictions have been exceeded.
The restart protection delay circuit is
in operation for 3 minutes.
OA processing unit operation has
restarted following the heating and
defrosting operation.
The air inlet or outlet of the OA pro-
and
CHECK
cessing unit and/or outdoor unit is
obstructed.
The filters are clogged with dust and
dirt.
The OA processing unit is not set to
the "
—
Water is not supplied.
There is no dry mode on the OA pro-
cessing unit. Cannot set to dry mode
—
from the remote controller.
When the unit is set to dry mode from
the central controller, the dry mode
display flashes on the LCD and the
OA processing unit fan operates.
Cause
heating" mode.
─ 13 ─
Remedy
1 Connect the power supply unit with
the transmission cable.
2 Check the power of the power sup-
ply unit.
3 Check the length of the transmis-
sion cable wiring. (See the technical
manual for details about the regula-
tions.)
Make connections within the transmis-
sion cable power supply restrictions of
the outdoor units, or the power supply
units. (See the technical manual for
details about the restrictions.)
Wait for a while.
(To protect the compressor, a 3
minutes delay circuit is built into the
OA processing unit. Therefore, some-
times the compressor will not start
operating immediately. This delay
may be up to 3 minutes.)
Wait for a while.
(Heating operation starts after de-
frosting operation has ended.)
Restart after removing the obstruc-
tion.
Restart after cleaning the filters.
Set to the heating mode.
Open the service valve.
Use a mode other than dry mode.