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 Red
Status indication
OFF OFF OFF
ON ON ON
OFF Blink ON
Hardware trouble
OFF OFF ON
Blink Blink ON
ON Blink Blink
ON ON Blink
ON OFF Blink
Abnormal condition
OFF OFF Blink
OFF Blink OFF
ON OFF ON
OFF ON Blink
Blink ON OFF
Samsung Electronics
Description
Power OFF / No power (SMPS error)
Power on reset ( 1~2 seconds )
Normal operation
Communication Error between
Main micom and inverter micom
Current sensor error
DC-LINK sensor error
AC-Line zero crossing error
DC LINK capacitor discharged.(Max 20sec.)
Option error (EEPROM error)
Comp. peak current (Over Current)
Comp. starting error
Comp. rotation error
DC-Link voltage error
Unit Over current protection
Troubleshooting
Live side
Neutral side
BD01
Note
If always in this pattern IC01(inverter micom)
has some trouble.
After power off this error will display until
12-7 12-7