9-3 Fault Diagnosis by Symptom

9-3-1 Basic Check Flow

Preparation : multimeter (AC voltage, DC voltage, Resistance)

Short check for safety

Power Source

check

Outdoor unit

Indoor unit

START

Check point

 

 

 

 

 

 

Detach cable cover of the terminal blocks

(HANDLE CABI RH) on outdoor unit.

Check resistance value between

No Good

• Outdoor unit controller (see 12-3-2)

 

L and N of Main power terminal block.

 

• Indoor unit controller (see 12-3-3)

OK : over 180KΩ

Apply the power

Check AC voltage between L and N of

 

No Good

 

• Power cable (see 12-3-4, 12-2)

 

 

MAIN power

 

terminal block.

 

 

• Breaker

 

 

 

 

OK : 207-253V(50Hz)

No Good

 

 

 

 

 

 

 

 

Check AC voltage between L and N of

 

 

Terminal block wiring

 

 

power terminal block for indoor unit.

 

 

 

 

 

 

 

 

OK : 207-253V

No

 

• Main PCB,

 

 

 

 

 

Is there any

 

display of LED?

 

 

 

• Display PCB,

 

 

 

 

Yes

 

 

• wiring between PCBs.

 

 

No Good

 

Starting by remocon or ON/OFF switch on the indoor

 

 

 

 

 

Start operation

 

 

 

 

unit or K2 button on the Outdoor PCB display.

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Any Error code on LED display?

Error code starts in '' ''

 

 

 

 

Wait for 5 minutes to check error

 

 

 

Consult error code table

 

 

 

 

 

code because some error judgement

 

 

 

 

 

 

 

 

 

 

 

needs long time.

 

 

 

 

 

 

No

 

 

• Remote control

 

 

 

 

 

 

Receiving of remote control signal ?

 

No

 

• Remote control battery

 

 

• Infrared signal receiving path

(Check by buzzer sound)

 

 

 

 

(front panel duct, infrared receiving module, wiring)

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check operation ON/OFF by the button

at lower right of the display module (By buzzer sound and LED display)

Ok

Any Error code on LED display?

Wait for 5 minutes to check error code

because some error judgement

needs long time

No

• Indoor unit,

 

 

• Wiring cable to outdoor unit

Yes

Error code starts in '' ''.

Error code consists of 4 digits and displays first 2 digit and last 2 digit alternatively.

Consult error code table

Check Major parts(See 12-5)

Consult error code(Next Page)

Samsung Electronics

9-12

Page 82
Image 82
Samsung MH026FNCA service manual Fault Diagnosis by Symptom, Basic Check Flow

MH026FNCA specifications

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