Is the
temperature
differnce between inlet and
outlet air 10-20degC
at cooling?
Check the indoor fan operation.
Check the temperature differnce between
inlet and outlet air.
Does the heat
load increase after
installtion?
“ WAIT ”
message is displayed (for 3 seconds) when
performing cooling, defrosting and heating
operations from the remote
controller.
Is the compressor
rotation speed low?
Are the
temperature conditions of
room and ambient air close to the
rated conditions?
Mistake in model selection.
Calculate heat load once more.
Check which control “Determination control
of conpressor rotation speed” or “Protective
control by controlling compressor rotation
speed” is appropriate to this phenomenon.
The unit is operating normally but is
operating under the contol for
protecting compressor or other
respective parts.
NO
YES
YES
NO
YES
YES
YES
NO
NO
Compressor
is operating.
NO
YES
NO
Note (1) Ambient: 35°C, Room: 27°CDB/19°CWB
(1)
It is normal.
(This unit is designed to
start in the soft start mode
by detecting the compressor
under dome temperature
when it restart after power
reset.
It is necessary to replace to
higher capacity unit or to
install additional unit.
Compressor refrigerant oil
protection control at starting
is activated. For the contents
of control, refer to the
compressor start control.
Compressor may be stopped
by the error detection
control. For the contents of
control, refer to anomalous
stop control by controlling
compressor rotation speed
of microcomputor control
functions.
Inspect the followings.
• Minor clogging of filter
• Minor fouling of heat
exchanger
• Minor short-circuit
• Minor shortage of
refrigerant amount
• Poor compression of
compressor
Considering appropriate
operation control, check
suspicious points.
Inspect the followings for
reference.
• Major clogging of filter
• Major fouling of heat
exchanger
• Major short-circuit
• Major shortage of
refrigerant amount
•
Compressor protection ON
• Indoor fan tap
• Valid setting of silent mode
2. Error detection method
3
.
Condition of error displayed
4. Presumable cause
•
Poor compression of
compressor
•
Faulty expansion valve
operation
Note:
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