Mitsubishi PLA-RP Manuel de service télécharger pdf (Page 67)

10-3. TROUBLESHOOTING BY INFERIOR PHENOMENA

Note: Refer to the manual of outdoor unit for the detail of remote

controller.

(3)Upward/downward vane perfor-

mance failure

1 The vane is not downward during defrosting and

heat preparation and when the thermostat is OFF in

HEAT mode. (Working of COOL protection function)

2 Vane motor does not rotate.

• Defective vane motor

• Breaking of wire or connection failure of connector

3 Upward/downward vane does not work.

• The vane is set to fixed position.

1 Normal operation (The vane is set to hor-

izontal regardless of remote control.)

2 Check 2 (left).

• Check the vane motor. (Refer to “How

to check the parts”.)

• Check for breaking of wire or connec-

tion failure of connector.

3 Normal operation (Each connector on

vane motor side is disconnected.)

Phenomena

Factor

Countermeasure

(1)LED2 on indoor controller board

is off.

• When LED1 on indoor controller board is also off.

1 Power supply of 220~240V is not supplied to outdoor

unit.

2 Defective outdoor controller circuit board.

3 Power supply of 220~240V is not supplied to indoor

unit.

4 Defective indoor power board.

5 Defective indoor controller board.

1 Check the voltage of outdoor power

supply terminal block (L, N)

• When AC 220~240V is not detected.

Check the power wiring to outdoor unit

and the breaker.

• When AC 220~240V is detected.

—Check 2 (below).

2 Check the voltage between outdoor

terminal block S1 and S2.

• When AC 220~240V is not detected.

Check the fuse on outdoor controller

circuit board (10A).

Check the wiring connection.

• When AC 220~240V is detected.

—Check 3 (below).

3 Check the voltage between indoor terminal

block S1 and S2.

• When AC 220~240V is not detected.

Check indoor/outdoor unit connecting

wire for mis-wiring.

• When AC 220~240V is detected.

—Check 4 (below).

4 Check voltage output from CN2S on indoor

power board (DC14V). Refer to 10-6-1.

• When no voltage is output.

Check the fuse on indoor power board.

Check the wiring connection.

• When output voltage is between 12V

and 16V.

—Check 5 (below).

5 Check the wiring connection between

indoor controller board and indoor power

board. If no problems are found, indoor

controller board is defective.

• When LED1 on indoor controller board is lit.

1 Mis-setting of refrigerant address for outdoor unit

(There is no unit corresponding to refrigerant

address “0”.)

1 Reconfirm the setting of refrigerant

address for outdoor unit

Set the refrigerant address to “0”.

(For grouping control system under

which 2 or more outdoor units are

connected, set one of the units to “0”.)

Set refrigerant address using SW1

on outdoor controller circuit board.

(2)LED2 on indoor controller board

is blinking.

• When LED1 on indoor controller board is also blinking.

Connection failure of indoor/outdoor unit connecting

wire

• When LED1 is lit.

Mis-wiring of remote controller wires

Under twin triple indoor unit system, 2 or more indoor

units are wired together.

1 Refrigerant address for outdoor unit is wrong or not

set.

Under grouping control system, there are some units

whose refrigerant address is 0.

2 Short-cut of remote controller wires

3 Defective remote controller

Check indoor/outdoor unit connecting wire

for connection failure. Check the connection

of remote controller wires in case of twin

triple indoor unit system. When 2 or more

indoor units are wired in one refrigerant

system, connect remote controller wires to

one of those units.

1 Check the setting of refrigerant address

in case of grouping control system.

If there are some units whose refrigerant

addresses are 0 in one group, set one of

the units to 0 using SW1 on outdoor

controller circuit board.

23 Remove remote controller wires and

check LED2 on indoor controller board.

• When LED2 is blinking, check the

short-cut of remote controller wires.

• When LED2 is lit, connect remote

controller wires again and:

if LED2 is blinking, remote controller

is defective; if LED2 is lit, connection

failure of remote controller terminal

block etc. has returned to normal.

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Mitsubishi PLA-RP Manuel de service Page 67

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