Mitsubishi MXZ-2A52VA Service Manual download pdf (Page 57)

Operation start

Check the outdoor unit

LED indicator.

Refer to 13-6.

A "Check of power supply".

• Indoor unit

serial signal

error

Refer to 13-6.

B "How to

check

mis-wiring and

serial signal

error".

• COOL or

HEAT

operation only

Refer to 13-6.

C "Check of

R.V. coil".

• When cooling,

room does not

cool.

Refer to 13-6.E

"How to check

of inverter/

compressor".

• When cooling, heat

exchanger of

non-operating indoor

unit frosts.

•When heating, non-

operating indoor unit

gets warm.

Refer to 13-6.

D "Check of LEV".

• When cooling,

dew drops in the

non-operating

indoor unit.

Check of mis-

piping

• When heating,

room does not get

warm.

Refer to 13-6.E

"How to check of

inverter/ compressor".

Check mis-piping,

shortage of capacity

Refer to 13-4.

Troubleshooting check table.

OFF

Both LED 1 and

LED 2 lighting

LED 1 or LED 2

has blinked.

13-3. Instruction of troubleshooting

• Check the indoor unit with referring to the indoor unit service manual, and confirm that there is any problem in the indoor

unit.

Then, check the outdoor unit with referring to this page.

11-time flash

15-time flash

• Check the connecting

wire between outdoor

electronic control

P.C. board and power

board.

• Replace the power

board.

• Check the connecting

wire among electronic

control P.C. board,

noise filter P.C. board

and power board.

• Replace the power

board.

• Refer to 13-6.D "Check

of LEV".

• Check the drain pump of

the indoor unit.

When the communication between

boards protection stop is

continuously performed twice.

Communication error occurs

between the electronic control P.C.

board and power board for more

than 10 seconds.

Current sensor protection stop is

continuously performed twice.

When a short or open circuit is

detected in the current sensor

during compressor operating.

The protection stop of the zero

cross detecting circuit is

continuously performed 10 times.

When zero cross signal cannot be

detected while the compressor is

operating.

When a failure is detected in the

operation of the converter during

operation.

When the bus-bar voltage exceeds

400V or falls to 200V or below

during compressor operating.

When the bus-bar voltage exceeds

400V or falls to 50V or below during

compressor operating.

Communication error

between P.C. boards

(MXZ-3A54/4A71/4A80)

Current sensor

Zero cross detecting circuit

Converter

Bus-bar voltage

(1)

Bus-bar voltage

(2)

wEven if this protection stop is

performed continuously three

times, it does not mean the

abnormality in outdoor power

system.

LEV for drain

Lighting 6 times

Lighting 7 times

5 times Goes

out

5 times

Goes

out

5 times

6 times

Goes

out

Goes

out

When the indoor unit detectes any

abnormal in the LEV for drain.

Lighting

Abnormal point

(Failure mode / protection)

Condition

Correspondence

Indoor/outdoor

unit failure mode

recall function

LED indication

(Outdoor P.C. board)

LED

1 LED

The left lamp of

OPERATION INDICATOR

lamp(Indoor unit)

NOTE : Blinking patterns of this mode differ from the ones of Troubleshooting check table (13-4.).

OB377--2.qxp 05.12.14 3:13 PM Page 57

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 97 98

Comments to this Manuals

No comments

Mitsubishi MXZ-2A52VA Service Manual Page 57

Comments to this Manuals

Related products and manuals for Split-system air conditioners Mitsubishi MXZ-2A52VA