(In the case of M-NET remote controller)

Symptom

 

 

 

Cause

Checking method & countermeasure

 

 

 

 

 

 

 

1 Despite pressing of

1)

M-NET transmission power source is not supplied

a) Check transmission terminal block of

remote controller

 

from outdoor unit.

remote controller for voltage.

ON/OFF switch,

 

1

Main power source of outdoor unit is not

i)

In case of 17 ~ 30V

operation does not

 

 

connected.

 

 

→ Faulty network remote controller

start and there is no

 

2

Disconnection of connector on outdoor unit circuit

ii) In case of less than 17V

electronic sound.

 

 

board.

 

 

→ See “Transmission Power Circuit

 

 

 

Main board

: CNS1, CNVCC3

 

 

(30V) Check Procedure”.

(No powering signal

 

 

INV board

: CNAC2, CNVCC1, CNL2

 

 

 

 

 

 

appears.)

 

3

Faulty power source circuit of outdoor unit.

 

 

 

 

 

 

 

 

 

• Faulty INV board,

 

 

 

 

 

 

 

 

 

• Blown fuse (F1 on INV board)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Broken diode stack

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Broken resistor (R1) for rush current protection

 

 

 

 

 

 

 

 

 

 

 

 

 

The cause of 2) and 3) is

 

 

2)

Short circuit of transmission line.

 

 

 

 

 

 

 

 

 

 

 

 

3)

Erroneous wiring of M-NET transmission line at outdoor unit.

 

 

 

displayed with self-diagnosis

 

 

 

 

 

 

 

 

1

Transmission line disconnection or slipping off from terminal

 

 

LED for 7102 error.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

block.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2Erroneous connection of indoor/outdoor transmission line to TB7.

4)Disconnection of transmission wiring at remote controller.

5)Faulty remote controller.

2 At about 10 seconds

1) Power source is not fed to indoor unit from transformer.

after turning remote

1

Main power source of indoor unit is not turned on.

controller operation

2

Disconnection of connector (CND, CNT, CN3T) on indoor controller board.

switch ON, the

3

Blown fuse on indoor controller board.

display distinguishes

4

Faulty or disconnected transformer of indoor unit.

and the operation

5

Faulty indoor controller board.

stops.

 

 

 

 

2)Faulty outdoor control circuit board uncontrolled.

As normal transmission is fails between indoor and outdoor units, outdoor unit model can not be recognized.

Checking method & countermeasure

 

 

Check indoor unit

 

 

 

 

 

 

power source terminal

 

 

 

 

Check indoor LED3

 

block voltage

 

 

 

 

 

 

 

 

 

 

 

 

AC 220~240V?

NO

Check main power source

Apply power

 

 

 

of power source wiring.

source again.

Lighting?

 

 

 

Extinguishing or

YES

 

 

 

 

 

 

 

 

 

 

Check fuse on circuit

 

 

 

 

Lighting

unable to confirm

 

 

 

 

 

 

board

 

 

 

 

 

 

 

YES

Check 220V~240V

 

 

 

Blown?

circuit for short circuit

 

 

 

 

 

 

 

NO

 

and ground fault.

 

 

 

 

 

 

 

 

 

Check connection of con-

 

 

 

 

 

 

nector (CND, CNT, CN3T)

 

 

 

 

 

 

Disconnected

YES

Improper connector

 

 

 

 

 

 

 

 

 

connection

 

 

 

NO

 

 

 

 

 

 

Check transformer

*1

 

 

 

 

 

resistance value

 

 

 

 

 

 

 

 

Check cause of trans-

 

 

 

 

NO

former disconnection.

 

 

 

Within rated?

• Ground fault on circuit

 

 

 

 

board

 

 

 

 

 

 

 

 

 

 

YES

 

• Ground fault on

 

 

 

 

sensor, LEV

 

 

 

Check self-diagnosis

 

 

Check for the change of LED

 

 

 

 

display by operating dip switch

function of outdoor unit

 

 

 

 

SW1 for self-diagnosis.

 

 

 

 

 

 

 

 

Changed?

NO

 

 

 

 

 

 

 

 

 

 

 

Check self-diagnosis function af-

 

 

 

ter powering outdoor unit again.

 

 

 

 

 

Changed?

NO

 

 

 

 

 

 

 

 

 

 

 

YES

Faulty outdoor unit

 

 

 

YES

 

Accidental

control circuit board

 

 

 

Faulty indoor

 

trouble

 

Repair

 

 

 

 

 

 

 

controller board

 

 

 

faulty point.

*1 Check the transformer in accordance with the “TROUBLE SHOOTING” in the indoor unit’s service handbook.

–79–

Page 80 Page 82
Page 81
Image 81
Mitsubishi Electronics PURY-P400 Case of M-NET remote controller, CNS1, CNVCC3, 30V Check Procedure, CNAC2, CNVCC1, CNL2
Page 80 Page 82

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