Mitsubishi Electric PMFY-P40VBM-E [14/32] Troubleshooting

7. Troubleshooting

Having trouble? Here is the solution. (Unit is operating normally.)

Noise is louder than specifications.

■ 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

Normal rooms

Low sound-

absorbing

rooms

Location

examples

Broadcasting

studio, music

room, etc.

Reception

room, hotel

lobby, etc.

Office, hotel

room

Noise levels 3 to 7 dB 6 to 10 dB 9 to 13 dB

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 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 operation lamp near the receiver for the wireless remote

controller on the indoor unit is blinking.

■ 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.

Warm air blows from the indoor unit intermittently when heating mode

is off or during fan mode.

■ 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.

The damper opens and closes automatically.

(For PFFY-P·VKM-E2)

■ The damper is automatically controlled by a microcomputer according to

the air flow temperature and operation time of the air conditioner.

Air outlet control (PFFY-P·VKM-E2)

This unit is automatically controlled that air comes out simultaneously from the upper and lower air outlets so that the room can be cooled or heated

effectively.

Description of operation

Operation COOL DRY HEAT FAN

Air flow

Upper and lower air flow

Upper air flow Upper air flow only

Upper and lower air flow

Upper air flow

Upper and lower air flow

Conditions

Room temperature

and set

temperature are

different.

Room temperature

is close to set

temperature or

thermo-off.

—

(Normal condition

(in heating))

During defrosting

operation, start of

operation, thermo-

off

—

• Be sure to keep the area around the damper of the lower air outlet free of any objects.

This unit can be set to blow out air from the upper air outlet only by changing the switch setting on the address board (ask the dealer).

Range of application

The range of working temperatures for both the indoor and outdoor units of the series Y, R2, Multi-S is as below.

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.

Mitsubishi Electric PMFY-P40VBM-E [14/32] Troubleshooting

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