koppel KV24ODU-ARF21 - Page 46

Electric Characteristics
9.1.2 Troubleshooting
NO. Malfunction
Running
lamp
Timer
lamp
Defrosting
lamp
Alarm
lamp
Display(nixie
tube)
1
Communication malfunction between indoor
and outdoor units.
X ☆ X X E1
2
Open or short circuit of T1 temperature
sensor
☆ X X X E2
3
Open or short circuit of T2 temperature
sensor
☆ X X X E3
4
Open or short circuit of T2B temperature
sensor
☆ X X X E4
5 Full-water malfunction X X X ☆ EE
6 EEPROM malfunction X X ☆ X E7
7 Outdoor unit malfunction X X X ◎ Ed
☆X(off) (flash at 5Hz) ◎(flash at 0.5Hz)
1. Running lamp flashes
44 Outdoor Units
Judge 1: Indoor temp. sensor is
abnormal
Running lamp flashes at 5Hz
Judge 1: Indoor temp. sensor is abnormal
Running lamp flashes at 5Hz
Check whether the resistance of the evaporator temp. sensor is
correct according to Annex 1
Judge 2: Room temp. sensor is abnormal
No
Yes
Check whether the resistance of the room temp.
sensor is correct according to Annex 1
Replace room temp. sensor
No
Replace indoor PCB
Yes