Error Code

Abnormal point and detection method

Case

Judgment and action

 

 

 

 

 

M-NET NO RESPONSE

1 Transmitting condition is

1 Check transmission waveform or noise on

 

Abnormal if a message was transmitted

repeated fault because of

transmission wire.

 

and there were reply (ACK) that message

noise and the like.

2 Turn off the power supply of outdoor unit and

 

was received, but response command

2 Extension of transmission wire

indoor unit and FRESH MASTER or LOSS-

 

does not return. Transmitting side detects

voltage and signal is caused

NAY at the same time for 2 minutes or more,

 

abnormality every 30 seconds, 6 times

by over-range transmission

and turn the power on again. If malfunction

 

wire.

 

continuously.

was accidental, the unit returns to normal. If

 

• Maximum distance ······200m

 

Note) The address and attribute displayed

the same abnormality generates again, con-

 

[656ft]

 

at remote controller indicate the con-

troller of displayed address and attribute

 

• Remote controller line ··(12m

 

troller that did not reply (ACK).

may be defective.

 

[39ft])

 

 

 

 

 

3 Extension of transmission wire

 

A8

 

voltage and signal is caused

 

(6608)

 

by type-unmatched transmis-

 

 

 

sion wire.

 

 

 

Type ······

 

 

 

With shield wire-

 

 

 

CVVS, CPEVS

 

 

 

With normal wire (no shield)-

 

 

 

VCTF, VCTFK, CVV

 

 

 

CVS, VVR, VVF, VCT

 

 

 

Diameter····1.25mm2 [AWG16]

 

 

 

or more

 

 

 

4 Accidental malfunction of

 

 

 

abnormality-generated

 

 

 

controller

 

 

 

 

 

10-5. TROUBLESHOOTING BY INFERIOR PHENOMENA

Phenomena

 

Factor

Countermeasure

 

 

 

1. Remote controller display does not

1DC12V is not supplied to remote controller.

1Check LED2 on indoor controller board.

work.

(Power supply display

is not indicated on LCD.)

(1) When LED2 is lit.

 

2DC12~15V is supplied to remote controller, however,

Check the remote controller wiring for

 

no display is indicated.

breaking or contact failure.

 

• “PLEASE WAIT” is not displayed.

(2) When LED2 is blinking.

 

• “PLEASE WAIT” is displayed.

Check short circuit of remote controller

 

 

 

wiring.

 

 

 

(3) When LED2 is not lit.

 

 

 

Refer to phenomena No.3 below.

 

 

 

2Check the following.

 

 

 

• Failure of remote controller if “PLEASE

 

 

 

WAIT” is not displayed

 

 

 

• Refer to phenomena No.2 below if

 

 

 

“PLEASE WAIT” is displayed.

 

 

 

2. “PLEASE WAIT” display is remained

1At longest 2 minutes after the power supply “PLEASE

1Normal operation

on the remote controller.

WAIT” is displayed to start up.

2Self-diagnosis of remote controller

 

2Communication error between the remote controller

3”PLEASE WAIT” is displayed for 6 min-

 

and indoor unit

 

utes at most in case of indoor/outdoor unit

 

3Communication error between the indoor and outdoor

communication error. Check LED3 on

 

unit

 

indoor controller board.

 

4Outdoor unit protection device connector is open.

(1)When LED3 is not blinking.

 

 

 

Check indoor/outdoor connecting wire

 

 

 

for miswiring.

 

 

 

(Converse wiring of S1 and S2, or

 

 

 

break of S3 wiring.)

 

 

 

(2)When LED3 is blinking.

 

 

 

Indoor/outdoor connecting wire is nor-

 

 

 

mal.

 

 

 

4Check LED display on outdoor controller

 

 

 

circuit board. Refer to 10-10.

 

 

 

Check protection device connector (63L

 

 

 

and 63H) for contact failure.

 

 

 

Refer to 10-9.

 

 

 

3. When pressing the remote controller

1After cancelling to select function from the remote

1Normal operation

operation switch the OPERATION

controller, the remote controller operation switch will

 

display is appeared but it will be

not be accepted for approx. 30 seconds.

 

turned off soon.

 

 

 

 

 

 

 

45

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Mitsubishi Electronics PUZ-A30NHA2, PUY-A36NHA2 Troubleshooting by Inferior Phenomena, Vctf, Vctfk, Cvv Cvs, Vvr, Vvf, Vct
Page 44 Page 46

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