Error Code

Abnormal point and detection method

Case

Judgment and action

 

Outdoor fan motor

1 Failure in the operation of

1 Check or replace the DC fan motor.

 

The outdoor fan motor is considered to be

the DC fan motor

 

 

abnormal if the rotational frequency of fan

2 Failure in the outdoor circuit

2 Check the voltage of the outdoor circuit

 

motor is abnormal when detected during

controller board

controller board during operation.

 

operation.

 

3 Replace the outdoor circuit controller

 

Fan motor rotational frequency is abnormal

 

board. (when the failure is still indicated

U8

if;

 

even after performing the remedy 1

• 100 rpm or below detected continuously

 

above.)

(4400)

 

for 15 seconds at 20:[68˚F] or more

 

 

 

 

 

 

outside air temperature

 

 

 

• 50 rpm or below or 1500 rpm or more

 

 

 

detected continuously for 1 minute.

 

 

 

 

 

 

Overvoltage or voltage shortage and

1 Decrease of power supply volt- 1 Check the facility of power supply.

 

synchronous signal to main circuit

age

2 Correct the wiring (U·V·W phase) to com-

 

Abnormal if any of followings are detected

2 Disconnection of compressor

pressor. Refer to 10-9 (Outdoor power circuit

 

wiring

board).

 

during compressor operation;

3 Disconnection or loose con-

3 Check CN52C wiring.

 

• Decrease of DC bus voltage to 310V

nection of CN52C

 

 

• Instantaneous decrease of DC bus volt-

4 Defective PFC module of out- 4 Replace outdoor power circuit board.

 

age to 200V

door power board (A12, 18,

(A12, 18, 24N only)

 

• Increase of DC bus voltage to

24N only)

 

 

A12, 18, 24N : 420V

5 Defective ACT module (A30,

5 Replace ACT module. (A30, 36, 42N only)

 

A30, 36, 42N : 400V

36, 42N only)

 

 

• Decrease of input current of outdoor unit

6 Defective ACT module drive

6 Replace outdoor power circuit board.

 

to 0.5A only if operation frequency is

circuit of outdoor power circuit

(A30, 36, 42N only)

 

more than or equal to 40Hz or compres-

board (A30, 36, 42N only)

 

 

sor

7 Disconnection or loose con-

7 Check CNAF wiring. (A30, 36, 42N only)

U9

current is more than or equal to 5A.

nection of CNAF (A30, 36, 42N

 

• Abnormal power synchronous (zero

only)

 

(4220)

 

cross) signal

8 Defective 52C drive circuit of

8 Replace outdoor noise filter circuit board.

 

 

• PFC error (overcurrent) when the current

outdoor noise filter circuit

 

 

peak of input current increase A12, 18,

board

 

 

24N: 47A (peak)

9 Disconnection or loose

9 Check CN5 wiring on the outdoor power

 

 

connection of CN5 on the

circuit board.

 

 

outdoor power circuit board

Refer to 10-9.

 

 

0 Disconnection or loose

0 Check CN2 wiring on the outdoor power

 

 

connection of CN2 on the

circuit board.

 

 

outdoor power circuit board

Refer to 10-9.

 

Compressor overcurrent interruption

1 Stop valve is closed.

1 Open stop valve.

 

(When compressor locked)

2 Decrease of power supply

2 Check facility of power supply.

 

Abnormal if overcurrent of DC bus or

voltage

 

 

compressor is detected within 30 seconds

3 Looseness, disconnection or

3 Correct the wiring (U·V·W phase) to

UF

after compressor starts operating.

converse of compressor wiring

compressor.

(4100)

 

connection

Refer to 10-9 (Outdoor power circuit board).

 

4 Defective compressor

4 Check compressor.

 

 

 

 

 

Refer to 10-6.

 

 

5 Defective outdoor power board 5 Replace outdoor power circuit board.

 

 

 

 

 

Current sensor error

1 Disconnection of compressor

1 Correct the wiring (U·V·W phase) to

 

• Abnormal if current sensor detects –1.5A

wiring

compressor. Refer to 10-9 (Outdoor power

 

to 1.5A during compressor operation.

 

circuit board).

 

(This error is ignored in case of test run

2 Defective circuit of current

2 Replace outdoor power circuit board.

 

mode.)

sensor on outdoor power

 

UH

w This error is ignored in case of test run

circuit board

 

(5300)

mode.

3 Decrease of power supply

3 Check the facility of power supply.

 

• It’s abnormal for 38A the input current or

voltage

 

 

10 seconds continuous 34A or more.

 

 

39

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Image 39
Mitsubishi Electronics PUZ-A42NHA2 Case Judgment and action Outdoor fan motor, Overvoltage or voltage shortage
Page 38 Page 40

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