Mitsubishi Electronics PUHY-YMC Transmission error Transmission route Busy Error, Display, 21S4

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3. Remote controller

Check code	Abnormality	Check code	Abnormality
6101	Unreadable response receiving error	6606	Transmission and reception error (Communication trou-
6600	Duplicated unit address setting		ble with transmission processor)
6602	Transmission error (Transmission processor hardware	6607	Transmission and reception error (No ACK error)
	error)	6608	Transmission and reception error (No responsive frame
6603	Transmission error (Transmission route BUSY)		error)

2Diagnostic switch (SW1) and the service LED on multi-controller board of the variable capacity unit can be used to judge a malfunction of outdoor unit.

<Operation of self-diagnosis switch (SW1) and the service LED display>

Self-diagnosing

SW1 setting

Display at LED lighting (blinking)

Remarks

item

Flag 1

Flag 2

Flag 3

Flag 4

Flag 5

Flag 6

Flag 7

Flag 8

Relay output

During

Compres-

Compres-

SV22/32

Always

Flag 8 always lights

display 1

A

compres-

sor 1

sor 2

21S4

SV1

(Note:1)

lighting

at microcomputer

(Lighting)

sor run

operations

operations

power ON

B

Check

1

2

3

4

5

6

7

8

9 10

C

(Note:1) Type 500

a

display 1

0000 to 9999 (Alternate display of address and error code)

only

(Blinking)

Relay output

A

SV4

21S4b

SV5b

SV6

CH2, 3

52F

SV5A and 5B are

display 2

B

closed with flag 1

1

2

3

4

5

6

7

8

9 10

A

No.1

No.2

No.3

No.4

No.5

No.6

No.7

No.8

B

unit

unit

unit

unit

unit

unit

unit

unit

1

2

3

4

5

6

7

8

9 10

A

No.9

No.10

No.11

No.12

No.13

No.14

No.15

No.16

B

unit

unit

unit

unit

unit

unit

unit

unit

Lights at emergency

Check

1

2

3

4

5

6

7

8

9 10

stop in IC

indoor unit

A

No.17

No.18

No.19

No.20

No.21

No.22

No.23

No.24

Turns off by resetting

B

unit

unit

unit

unit

unit

unit

unit

unit

1

2

3

4

5

6

7

8

9 10

A

No.25

No.26

No.27

No.28

No.29

No.30

No.31

No.32

B

unit

unit

unit

unit

unit

unit

unit

unit

1

2

3

4

5

6

7

8

9 10

A

No.1

No.2

No.3

No.4

No.5

No.6

No.7

No.8

B

unit

unit

unit

unit

unit

unit

unit

unit

1

2

3

4

5

6

7

8

9 10

A

No.9

No.10

No.11

No.12

No.13

No.14

No.15

No.16

B

unit

unit

unit

unit

unit

unit

unit

unit

Lights at cooling

Indoor unit

1

2

3

4

5

6

7

8

9 10

b

Blinks at heating

mode

A

No.17

No.18

No.19

No.20

No.21

No.22

No.23

No.24

Turns off at stop/fan

B

unit

unit

unit

unit

unit

unit

unit

unit

1

2

3

4

5

6

7

8

9 10

A

No.25

No.26

No.27

No.28

No.29

No.30

No.31

No.32

B

unit

unit

unit

unit

unit

unit

unit

unit

1

2

3

4

5

6

7

8

9 10

A

No.1

No.2

No.3

No.4

No.5

No.6

No.7

No.8

B

unit

unit

unit

unit

unit

unit

unit

unit

1

2

3

4

5

6

7

8

9 10

A

No.9

No.10

No.11

No.12

No.13

No.14

No.15

No.16

B

unit

unit

unit

unit

unit

unit

unit

unit

Lights at thermostat

Indoor unit

1

2

3

4

5

6

7

8

9 10

on Turns off at

thermostat

A

No.17

No.18

No.19

No.20

No.21

No.22

No.23

No.24

thermostat off

B

unit

unit

unit

unit

unit

unit

unit

unit

1

2

3

4

5

6

7

8

9 10

A

No.25

No.26

No.27

No.28

No.29

No.30

No.31

No.32

B

unit

unit

unit

unit

unit

unit

unit

unit

1

2

3

4

5

6

7

8

9 10

Indoor unit

A

Displays in order the addresses (1 through 50) of all indoor units connected to the outdoor unit.

address

B

1

2

3

4

5

6

7

8

9 10

a Outdoor unit

A ON

* Turn SW4-2 of variable capacity unit off. If SW4-2 is on, constant capacity unit data will be

b Indoor unit

B OFF

displayed.

CAt factory shipment

36