Error Code

Abnormal point and detection method

Case

Judgment and action

 

 

 

 

 

Communication error with communica-

1 Data of transmission proces-

Turn off the power supply of outdoor unit and

 

tion processor

sor or unit processor is not

indoor unit and FRESH MASTER or LOSSNAY

 

Defective communication between unit

transmitted normally because

at the same time for 2 minutes or more, and

 

processor and transmission processor

of accidental trouble such as

turn the power on again. System returns to nor-

 

Note) The address and attribute display at

noise or thunder surge.

mal if abnormality was accidental malfunction.

A6

remote controller indicate the con-

2 Address forwarding from unit

If the same abnormality generates again,

(6606)

troller that detected abnormality.

processor is not transmitted

abnormality-generated controller may be defec-

normally because of defective

tive.

 

 

 

 

transmission processor hard-

 

 

 

ware.

 

 

 

 

 

 

NO ACK signal

Common factor that has no rela-

Always try the followings when the error

 

1. Transmitting side controller detects

tion with abnormality source.

“A7” occurs.

 

abnormal if a massage was transmitted

1 The unit of former address

 

 

but there is no reply (ACK) that a mes-

does not exist as address

1 Turn off the power supply of outdoor unit and

 

sage was received. Transmitting side

switch has changed while the

indoor unit and FRESH MASTER or LOSS-

 

unit was energized.

NAY at the same time for 2 minutes or more,

 

detects abnormality every 30 seconds, 6

 

2 Extinction of transmission wire

and turn the power on again. If malfunction

 

times continuously.

voltage and signal is caused by

was accidental, the unit returns to normal.

 

Note) The address and attribute displayed

 

over-range transmission wire.

2 Check address switch of abnormality gener-

 

at remote controller is indicate the

 

• Maximum distance ······200m

ated address.

 

controller that did not reply (ACK).

 

[656ft]

3 Check disconnection or looseness of abnor-

 

 

 

 

• Remote controller line ··(12m

mality generated or abnormality detected

 

 

[39ft])

transmission wire (terminal block and con-

 

 

3 Extinction of transmission wire

nector)

 

 

voltage and signal is caused by

4 Check if tolerance range of transmission wire

 

 

type-unmatched transmission

is not exceeded.

 

 

wire.

5 Check if type of transmission wire is correct

 

 

Type ······

or not.

 

 

With shield wire-

 

 

 

CVVS, CPEVS

If there were some troubles of 1-5above,

 

 

With normal wire (no shield)-

repair the defective, then turn off the power

 

 

VCTF, VCTFK, CVV

supply of outdoor unit and indoor unit and

 

 

CVS, VVR, VVF, VCT

FRESH MASTER or LOSSNAY at the same

 

 

Diameter····1.25mm2 [AWG16]

time for 2 minutes or more, and turn the power

 

 

or more

on again.

 

 

4 Extinction of transmission wire

• If there was no trouble with 1-5above in sin-

 

 

voltage and signal is caused

gle refrigerant system (one outdoor unit), con-

 

 

by over-numbered units.

troller of displayed address or attribute is

 

 

5 Accidental malfunction of

defective.

 

 

abnormality-detected controller

• If there was no trouble with 1-5above in dif-

 

 

(noise, thunder surge)

ferent refrigerant system (2 or more outdoor

A7

 

6 Defective of abnormality gen-

units), judge with 6.

(6607)

 

erated controller

6 If address of abnormality source is the

 

 

 

 

 

 

2. If displayed address or attribute is out-

1 Contact failure of transmission

address that should not exist, there is the

 

door unit, Indoor unit detects abnormali-

wire of outdoor unit or indoor

unit that memorizes nonexistent address

 

ty when indoor unit transmitted to out-

unit

information. Delete useless address informa-

 

door unit and there was no reply (ACK).

2 Disconnection of transmission

tion with manual setting function of remote

 

 

connector (CN2M) of outdoor

controller.

 

 

unit

Only the system FRESH MASTER or LOSS-

 

 

3 Defective transmitting receiv-

NAY are connected to, or the system that is

 

 

ing circuit of outdoor unit or

equipped with group setting of different

 

 

indoor unit

refrigerant system.

 

 

 

If there was no trouble with 1-6above,

 

 

 

replace the controller board of displayed

 

3. If displayed address or attribute is

1 During group operation with

 

address or attribute.

 

indoor unit, remote controller detects

indoor unit of multi- refrigerant

 

If the unit does not return to normal, multi-con-

 

abnormality when remote controller

system, if remote controller

 

troller board of outdoor unit may be defective

 

transmitted to indoor unit and there was

transmit to indoor unit while

 

(repeater circuit).

 

no reply (ACK).

outdoor unit power supply of

 

Replace multi-controller board one by one to

 

 

one refrigerant system is

 

 

check if the unit returns to normal.

 

 

turned off or within 2 minutes

 

 

 

 

 

of restart, abnormality is

 

 

 

detected.

 

 

 

2 Contact failure of transmission

 

 

 

wire of remote controller or

 

 

 

indoor unit

 

 

 

3 Disconnection of transmission

 

 

 

connector (CN2M) of indoor

 

 

 

unit

 

 

 

4 Defective transmitting receiv-

 

 

 

ing circuit of indoor unit or

 

 

 

remote controller

 

 

 

 

 

 

 

 

Continued to the next page.

43

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Mitsubishi Electronics PUY-A12NHA2-BS, PUZ-A42NHA2-BS, PUZ-A30NHA2, PUY-A36NHA2, PUZ-A18NHA2-BS, PUY-A30NHA2-BS To the next
Page 42 Page 44

PUZ-A36NHA2-BS, PUY-A12NHA2, PUY-A42NHA2-BS, PUY-A30NHA2, PUZ-A36NHA2 specifications

Mitsubishi Electronics has long been a leader in the HVAC industry, and their range of air conditioning units, including the PUY-A24NHA2, PUZ-A24NHA2, PUY-A24NHA2-BS, PUZ-A42NHA2-BS, and PUY-A42NHA2, exemplifies their commitment to innovation and energy efficiency. These models are designed to provide optimal climate control for both residential and commercial applications, ensuring comfort throughout the year.

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