Samsung MH020FPEA Service Manual page 180

12-3-2 Checking Outdoor Controller
1. Making sure the wire connections.
2. Checking AC line
1) Checking FUSE
2) Checking resistance between 'L wire (BRN)' and 'DB01 Live
side' normal value : 190 - 210Ω
If value is ∞ then check R001.
3) Checking resistance between 'N wire (SKYBLU)' and 'DB01 Neutral side'
normal value : 0 - 0.1Ω
3. Checking ON/OFF pattern of LED1(Red), LED2(Green), LED3(Yellow)
Apply the power then ALL LEDs are on for about 1 second. then changed to as follow.
I LED1 (Red) : ALWAYS ON
I LED2 (Green) : Blinking 4 times a second
(This means communication between 2 micoms IC01 and IC50 is normal)
I LED3 (Yellow) : OFF
G In case of another pattern inverter micom detects some hardware trouble or abnormal condition.
Yellow Green
Status indication
OFF OFF
ON ON
OFF Blink
Hardware trouble
OFF OFF
Blink Blink
ON Blink
ON ON
ON OFF
Abnormal condition
OFF OFF
OFF Blink
ON OFF
OFF ON
Blink ON
Samsung Electronics
Red Description
OFF Power OFF / No power (SMPS error)
ON Power on reset ( 1~2 seconds )
ON Normal operation
Communication Error between
ON
Main micom and inverter micom
ON Current sensor error
Blink DC-LINK sensor error
AC-Line zero crossing error
Blink
DC LINK capacitor discharged.(Max 20sec.)
Blink Option error (EEPROM error)
Blink Comp. peak current (Over Current)
OFF Comp. starting error
ON Comp. rotation error
Blink DC-Link voltage error
OFF Unit Over current protection
Live side
BD01
Note
If always in this pattern IC01(inverter micom)
has some trouble.
After power off this error will display until
Troubleshooting
Neutral side
12-7 12-7