Fault Diagnosis By Symptom - Samsung MH020FPEA Service Manual

6-3 Fault Diagnosis by Symptom

6-3-1 Basic Check Flow
Preparation : multimeter (AC voltage, DC voltage, Resistance)
Item
• Detach cable cover of the terminal blocks
(HANDLE CABI RH) on outdoor unit.
Short check
for safety
Check resistance value between L and N
of Main power terminal block.
• Apply the power
Power
Source check
Check AC voltage between L and N of
MAIN power terminal block.
Check AC voltage between L and N of
power terminal block for indoor unit.
Is there any display of LED
Outdoor unit
Any Error code on LED display?
Wait for 5 minutes to check error code
because some error judgement needs
long time.
Check receiving of remote control signal
Check operation ON/OFF by the button at
Indoor unit lower right of the display module
Any Error code on LED display?
Wait for 5 minutes to check error code
because some error judgement needs
long time
Is the error code related to
communication?
Is the error code related to cycle
protection?
Error code
Are some of the indoor units' operation
mode (cooling/heating) different from
others?
Error related outdoor controller except
temperature sensor and communication
between indoor unit and outdoor unit?
64
Procedure Judgement
OK : over 180KΩ • Outdoor unit controller
• Indoor unit controller
OK : 207-253V (50Hz) • Power cable
• Breaker
OK : 207-253V terminal block wiring
• Main PCB,
• Display PCB,
• Wiring between PCBs.
Error code starts in " " Consult error code table
By buzzer sound • Remote control
• Remote control battery
• Infrared signal receiving path (front panel
By buzzer sound and • Indoor unit,
LED display • Wiring cable to outdoor unit
Error code starts in " ". Consult error code table
Error code consists of 4
digits and displays first 2
digit and last 2 digit
alternatively.
, , , • Cable wiring between indoor and outdoor
, , • Communication wire socket check on
• Cycle check
,
• Pipe matching
Each indoor unit operation mode
Consult LED pattern on wiring diagram on
-- outdoor controller
Next check if fault
dirt, infrared receiving module, wiring)
outdoor unit controller PCB
Samsung Electronics