Mitsubishi Electric CITY MULTI PKFY-P VLM Series Operation Manual page 16

7. Troubleshooting
Having trouble?
Noise is louder than specifications.
Nothing appears in the wireless remote controller display, the display
is faint, or signals are not received by the indoor unit unless the
remote controller is close.
The operation lamp near the receiver for the wireless remote
controller on the indoor unit is blinking.
Warm air blows from the indoor unit intermittently when heating mode
is off or during fan mode.
The wireless remote controller does not operate (the indoor unit
beeps 4 times).
Refrigerant noise is heard or warm air comes out from the suspended
indoor unit.
Warning:
If the air conditioner operates but does not cool or heat (depending on model) the room, consult your dealer since there may be a
refrigerant leak. Be sure to ask the service representative whether there is refrigerant leakage or not when repairs are carried out.
The refrigerant charged in the air conditioner is safe. Refrigerant normally does not leak. However, if refrigerant gas leaks indoors, and
comes into contact with the fire of a fan heater, space heater, stove, etc., harmful substances will be generated.
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Here is the solution. (Unit is operating normally.)
■
The indoor operation sound level is affected by the acoustics of the
particular room as shown in the following table and will be higher than
the noise specification, which was measured in an echo-free room.
High sound-
absorbing
rooms
Broadcasting
Location
studio, music
examples
room, etc.
Noise levels 3 to 7 dB
■
The batteries are low.
Replace the batteries and press the Reset button.
■
If nothing appears even after the batteries are replaced, make sure that
the batteries are installed in the correct directions (+, –).
■
The self diagnosis function has operated to protect the air conditioner.
■
Do not attempt to repair this equipment by yourself.
Turn off the power switch immediately and consult your dealer. Be sure
to provide the dealer with the model name.
■
When another indoor unit is operating in heating mode, the control valve
opens and closes occasionally to maintain stability in the air conditioning
system. This operation will stop after a while.
* If this will cause an undesirable rise in the room temperature in small
rooms, etc., stop the operation of the indoor unit temporarily.
■
Switch the auto mode setting to the AUTO (single set point) mode or
AUTO (dual set point) mode. For details, refer to the included Notice (A5
sheet) or the Installation Manual.
■
A small amount of refrigerant flows into the suspended indoor unit while
other indoor units are in operation at HEAT mode.
Low sound-
Normal rooms absorbing
rooms
Reception
Office, hotel
room, hotel
room
lobby, etc.
6 to 10 dB 9 to 13 dB