Mitsubishi Electric PUHZ-SW50VHA Service Manual download pdf (Page 24)

A ﬂ owing water sound or occasional hissing sound is heard.

■

These sounds can be heard when refrigerant and/or water is (are) ﬂ owing

in the indoor unit or refrigerant pipe, or when the refrigerant and/or water

is (are) chugging.

Water does not heat or cool well.

■

Clean the filter of water piping. (Flow is reduced when the filter is dirty or

clogged.)

■

Check the temperature adjustment and adjust the set temperature.

■

Make sure that there is plenty of space around the outdoor unit.

Water or vapour is emitted from the outdoor unit.

■

During cooling mode, water may form and drip from the cool pipes and joints.

■

During heating mode, water may form and drip from the heat exchanger

of outdoor unit.

■

During defrosting mode, water on the heat exchanger of outdoor unit

evaporates and water vapour may be emitted.

The operation indicator does not appear in the remote control-

ler display.

■

Turn on the power switch. “

” will appear in the remote controller display.

“

” appears in the remote controller display.

■

During external signal control, “ ” appears in the remote controller dis-

play and FTC operation cannot be started or stopped using the remote

controller.

When restarting the outdoor unit soon after stopping it, it does

not operate even though the ON/OFF button is pressed.

■

Wait approximately 3 minutes. (Operation has stopped to protect the out-

door unit.)

FTC operates without the ON/OFF button being pressed.

■

Is the on timer set?

Press the ON/OFF button to stop operation.

■

Is the FTC connected to a external signal?

Consult the concerned people who control the FTC.

■

Does “ ” appear in the remote controller display?

Consult the concerned people who control the FTC.

■

Has the auto recovery feature from power failures been set?

Press the ON/OFF button to stop operation.

FTC stops without the ON/OFF button being pressed.

■

Is the off timer set?

Press the ON/OFF button to restart operation.

■

Is the air conditioner connected to a central remote controller?

Consult the concerned people who control the FTC.

■

Does “

” appear in the remote controller display?

Consult the concerned people who control the FTC.

Remote controller timer operation cannot be set.

■

Are timer settings invalid?

If the timer can be set,

WEEKLY

SIMPLE

, or

AUTO OFF

appears in the

remote controller display.

“PLEASE WAIT” appears in the remote controller display.

■

The initial settings are being performed. Wait approximately 3 minutes.

■

If the remote controller is not only for FTC, change it.

An error code appears in the remote controller display.

■

The protection devices have operated to protect the FTC and outdoor unit.

■

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 and information that appeared in

the remote controller display.

•

If the unit cannot be operated properly after test run, refer to the following table to find the cause.

Symptom

Cause

Wired remote controller LED 1, 2 (PCB in outdoor unit)

PLEASE WAIT

PLEASE WAIT → Error code

Display messages do not

appear even when operation

switch is turned ON (operation

lamp does not light up).

For about 2

minutes after

power-on

Subsequent to

about 2 minutes

after power-on

After LED 1, 2 are lighted, LED 2 is

turned off, then only LED 1 is

Only LED 1 is lighted. →

LED 1, 2 blink.

Only LED 1 is lighted.

→

LED 1 blinks twice,

LED 2 blinks once.

•

For about 2 minutes following power-on,op-

eration of the remote controller is not possible

due to system start-up. (Correct operation)

• Connector for the outdoor unit’s protection

device is not connected.

• Reverse or open phase wiring for the outdoor

unit’s power terminal block (L1, L2, L3)

• Incorrect wiring between FTC and outdoor

(incorrect polarity of S1, S2, S3)

• Remote controller wire short

Note: Operation is not possible for about 30 seconds after cancellation of function selection. (Correct operation)

For description of each LED (LED1, 2, 3) provided on the FTC, refer to the following table.

LED1 (power for microprocessor) Indicates whether control power is supplied. Make sure that this LED is always lit.

LED2 (power for remote controller) Indicates whether power is supplied to the remote controller.

This LED lights only in the case of the FTC which is connected to the outdoor unit

refrigerant addresses “0”.

LED3 (communication between FTC and outdoor units) Indicates state of communication between the FTC and outdoor units.

Make sure that this LED is always blinking.

lighted.

(Correct operation)

10-4. TROUBLESHOOTING

OCH525

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Mitsubishi Electric PUHZ-SW50VHA Service Manual Page 24

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