Symptoms: Nothing is displayed on the remote controller 2

LED display of the indoor controller board

LED1 : LED2 :

LED3 : or

Diagnosis flow

Cause

Inspection method and

troubleshooting

 

 

Check the voltage between S1 and S2 on the terminal block (TB4) of the indoor unit.

AC 187V to AC 253V?

NO

 

YES

 

Check the status

Not lighting.

of the indoor controller

 

board LED3 display.

Check the looseness or disconnection

 

of the indoor/outdoor connecting wire.

Blinking

Are there looseness or

YES

 

disconnection of the indoor/

 

• Breaking or poor

• Fix the breaking or poor

outdoor connecting wire?

 

contact of the indoor/

contact of the indoor/outdoor

 

 

 

NO

 

outdoor connecting

connecting wire.

 

wire

 

 

 

 

 

Check the refrigerant address of the outdoor unit. (SW1-3 to 1-6)

Is the refrigerant

 

NO

• Normal

• Set the refrigerant

address “0”?

 

 

 

 

Only the unit which

address to “0”. In case of

 

 

 

 

YES

 

 

has the refrigerant

the multiple grouping

Check the LED display of the

 

 

address “0” supplies

system, recheck the

 

 

power to the remote

refrigerant address again.

outdoor unit after turning on the

 

main power again.

 

 

controller.

 

Is anything displayed?

 

Not displayed.

• Defective outdoor

• Replace the outdoor

 

 

 

 

 

 

 

controller circuit

controller circuit board.

Displayed.

 

 

board

 

Is “EA” or “Eb”

NO

 

 

 

 

displayed?

 

 

 

 

 

YES

 

Is “E8” displayed?

YES

• Defective outdoor

• Replace the outdoor

 

 

 

 

 

 

 

controller circuit

controller circuit board.

 

 

NO

 

board

 

 

 

Can the unit be restarted?

 

 

 

 

 

Can all the indoor

NO

• Defective indoor

• Replace the indoor controller

 

 

unit be operated?

 

controller board

board of the indoor unit which

 

 

 

 

Check the voltage between S2

YES

 

 

doesn’t operate.

and S3 on the terminal block of

 

 

• Influence of

• Not abnormal.

the outdoor unit.

 

 

 

electromagnetic noise

There may be the influence

 

 

 

 

 

 

 

 

 

of electromagnetic noise.

 

 

 

 

 

Check the transmission wire

 

 

 

 

 

and get rid of the causes.

DC 17V to DC 28V?

NO

 

 

• Defective outdoor

• Replace the outdoor

 

 

 

 

 

 

 

power circuit board

power circuit board.

YES

 

 

 

• Defective indoor

• Replace the indoor

 

 

 

 

 

 

 

 

power board

power board.

49

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Page 49
Image 49
Mitsubishi Electronics PUY-A36NHA2-BS Not lighting, Indoor/outdoor connecting wire Blinking, Contact of the indoor
Page 48 Page 50

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