Indication

Outdoor controller board

Contents

LED1 (Green) LED2 (Red)

3 blinking 1 blinking Abnormality of shell thermostat and discharging temperature (TH4)

2 blinking Abnormal high pressure (High pressure switch 63H worked.)

 

Error

Error

Inspection method

code

w1

 

U2

1Check if stop valves are open.

 

2Check if connectors (TH4, LEV-A) on outdoor controller board are not

 

disconnected.

 

3Check if unit is filled with specified amount of refrigerant.

 

4Measure resistance values among terminals on indoor valve and outdoor linear

 

expansion valve using a tester.

U1

1Check if indoor/outdoor units have a short cycle on their air ducts.

 

2Check if connector (63H) on outdoor controller board is not disconnected.

3Check if heat exchanger and filter is not dirty.

4Measure resistance values among terminals on linear expansion valve using a tester.

Detailed

reference

page

P.37

P.37

3 blinking Abnormality of outdoor fan

U8

motor rotational speed

 

4 blinking Compressor overcurrent breaking (Start-up locked)

UF

Compressor overcurrent breaking

UP

Abnormality of current sensor (P.B.)

UH

Abnormality of power module

U6

5 blinking Open/short of discharge thermistor (TH4)

U3

Open/short of outdoor thermistors

U4

(TH3, TH6, TH7 and TH8)

 

6 blinking Abnormality of heatsink

U5

temperature

 

7 blinking Abnormality of voltage

U9

1Check the outdoor fan motor.

1Check if stop valves are open.

2Check looseness, disconnection, and converse connection of compressor wiring. 3Measure resistance values among terminals on compressor using a tester.

4Check if outdoor unit has a short cycle on its air duct.

1Check if connectors (TH3, TH4, TH6 and TH7) on outdoor controller board and conn- ector (CN3) on outdoor power board are not disconnected.

2Measure resistance value of outdoor thermistors.

1Check if indoor/outdoor units have a short cycle on their air ducts. 2Measure resistance value of outdoor thermistor(TH8).

1Check looseness, disconnection, and converse connection of compressor wiring. 2Measure resistance value among terminals on compressor using a tester.

3Check the continuity of contactor (52C).

4Check if power supply voltage decreases.

5Check the wiring of CN52C.

6Check the wiring of CNAF.

P.39

P.39

P.40

P.39

P.38

P.38

P.38

P.38

P.39

4 blinking 1 blinking Abnormality of room temperature thermistor (TH1) Abnormality of pipe temperature thermistor /Liquid (TH2) Abnormality of pipe temperature thermistor/Condenser-Evaporator(TH5)

2 blinking Abnormality of drain sensor (DS) Float switch connector open(FS) Indoor drain overflow protection

3 blinking Freezing (cooling)/overheating

(heating) protection

4 blinking Abnormality of pipe temperature

5 blinking Abnormality of indoor con- troller board

–– Abnormality of remote con- troller board

W1 Error code displayed on remote controller W2 Refer to service manual for indoor unit.

P1

P2

P9

P4

P5

P6

P8

Fb

E1

E2

1Check if connectors (CN20, CN21, CN29, and CN44) on indoor controller board are not disconnected.

2Measure resistance value of indoor thermistors.

1Check if connector (CN31)(CN4F) on indoor controller board is not disconnected. 2Measure resistance value of indoor thermistors.

3Measure resistance value among terminals on drain-up machine using a tester.

4Check if drain-up machine works.

5Check drain function.

1Check if indoor unit has a short cycle on its air duct.

2Check if heat exchanger and filter is not dirty.

3Measure resistance value on indoor and outdoor fan motors.

4Check if the inside of refrigerant piping is not clogged.

1Check if indoor thermistors (TH2 and TH5) are not disconnected from holder. 2Check if stop valve is open.

3Check converse connection of extension pipe. (on plural units connection)

4Check if indoor/outdoor connecting wire is connected correctly. (on plural units connection)

1Replace indoor controller board.

1Replace remote controller.

W2

W2

W2

W2

W2

W2

w2

P.40

75

Page 74 Page 76
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Image 75
Mitsubishi Electronics PUY-A30NHA2, PUZ-A42NHA2-BS, PUZ-A30NHA2 Blinking Abnormality of outdoor fan Motor rotational speed
Page 74 Page 76

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