Mitsubishi Electric PUHZ-SW50VHA Service Manual download pdf (Page 22)

Error Code

Abnormal points and detection method

Judgment and action

Case

Indoor/outdoor unit communication

error (Transmitting error) (Outdoor unit)

1 Abnormal if “0” receiving is detected

30 times continuously though outdoor

controller circuit board has transmitted

“1”.

2 Abnormal if outdoor controller circuit

board could not find blank of transmission

path for 3 minutes.

1 Indoor/ outdoor unit connecting

wire has contact failure.

2 Defective communication circuit

of outdoor controller circuit board

3 Noise has entered power supply.

4 Noise has entered indoor/

outdoor unit connecting wire.

1 Check disconnection or looseness of indoor/

outdoor unit connecting wire.

2~4 Turn the power off, and on again to

check. Replace outdoor controller circuit

board if abnormality is displayed again.

Indoor/outdoor unit communication

error (Signal receiving error)

(Outdoor unit)

Abnormal if outdoor controller circuit board

could not receive anything normally for 3

minutes.

1 Contact failure of indoor/

outdoor unit connecting wire

2 Defective communication circuit

of outdoor controller circuit board

3 Defective communication circuit

of indoor controller board

4 Noise has entered into indoor/

outdoor unit connecting wire.

1 Check disconnection or looseness of indoor/

outdoor unit connecting wire of indoor or

outdoor units.

2~4 Turn the power off, and on again to

check. Replace indoor controller board

or outdoor controller circuit board if

abnormality is displayed again.

Indoor/outdoor unit communication

error (Signal receiving error)

1 Abnormal if indoor controller board could

not receive any signal normally for 6

minutes after turning the power on.

2 Abnormal if indoor controller board could

not receive any signal normally for 3

minutes.

3 Consider the unit as abnormal under

the following condition. When 2 or more

indoor units are connected to an outdoor

unit, indoor controller board could not

receive a signal for 3 minutes from

outdoor controller circuit board, a signal

which allows outdoor controller circuit

board to transmit signals.

w Check LED display on outdoor controller

circuit board. (Connect A-Control service tool

(PAC-SK52ST))

Refer to EA~EC item if LED displays EA~AC.

1 Check disconnecting or looseness of indoor

/outdoor unit connecting wire of indoor unit

or outdoor unit.

Check all the units in case of twin/triple/

quadruple indoor unit system.

2~4

Turn the power off, and on again to check.

If abnormality generates again, replace

indoor controller board or outdoor controller

circuit board.

Other indoor controller board may have

defect in case of twin/triple/quadruple indoor

unit system.

5 Turn the power off, and detach fan motor

from connector (CNF1, 2). Then turn the

power on again.

If abnormality is not displayed, replace fan

motor.

If abnormality is displayed, replace outdoor

controller circuit board.

6 Check the rush current resistor on outdoor

power circuit board with tester. If open is

detected, replace the power circuit board.

1 Contact failure, short circuit or

miswiring (converse wiring) of

indoor/outdoor unit connecting

wire

2 Defective transmitting receiving

circuit of outdoor controller

circuit board.

3 Defective transmitting receiving

circuit of indoor controller

board.

4 Noise has entered into indoor/

outdoor unit connecting wire.

5 Defective fan motor

6 Defective rush current resistor

of outdoor power circuit board

Non defined error code

This code is displayed when non defined

error code is received.

1 Noise has entered transmission

wire of remote controller.

2 Noise has entered indoor/

outdoor unit connecting wire.

3 Outdoor unit is not a series of

power-inverter.

4 Model name of remote

controller is PAR-S25A.

12 Turn the power off, and on again to check.

Replace indoor controller board or outdoor

controller circuit board if abnormality is

displayed again.

3 Replace outdoor unit with power-inverter type

outdoor unit.

4 Replace remote controller with MA remote

controller.

Serial communication error

1 Abnormal if serial communication

between outdoor controller circuit board

and outdoor power circuit board is

defective.

1 Breaking of wire or contact

failure of connector CN2

between the outdoor controller

circuit board and the outdoor

power circuit board

2 Breaking of wire or contact

failure of connector CN4

between the outdoor controller

circuit board and the outdoor

power circuit board

3 Defective communication circuit

of outdoor power circuit board

4 Defective communication circuit

of outdoor controller circuit board

for outdoor power circuit board

12 Check connection of each connector CN2

and CN4 between the outdoor controller

circuit board and the outdoor power circuit

board.

3 Replace outdoor power circuit board.

4 Replace outdoor controller circuit board.

OCH525

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Mitsubishi Electric PUHZ-SW50VHA Service Manual Page 22

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