Samsung ACH2400C Service Manual page 23

Trouble Shooting
EC01 : Trouble on the thermistor related part of indoor unit.
• EC01 : Trouble on the room thermistor related part of indoor unit.
- E1 of outdoor unit PCB 7-segment
- Reservation lamp of wireless receiving board is flickering with 1 Hz.
- Action items when "*1" displays on the wired remote controller.
Check point :
- Defect of indoor unit
- Indoor unit thermistor defect
Indoor unit thermistor installed at CN8?
YES
Is the vlotage across the thermistor 4.9V and
higher or 0.5V and lower?
YES
Replace the thermistor
"*" stands for the indoor unit address.
EC02 : Trouble on the pipe thermistor related part of indoor unit.
- E5 of outdoor unit PCB 7-segment.
- Reservation lamp of wireless receiving board is flickering with 1 Hz.
- Action items when "*5" displays on the wired remote controller.
Check point :
- Indoor unit PCB defect
- Indoor unit pipe thermistor defect
Is the indoor unit pipe thermistor installed at CN8?
YES
Is the voltage across thermistor 4.9V and higher
or 0.5V lower?
YES
Replace the thermistor
22
NO
Indoor the indoor unit thermistor at CN8
NO
Replace the indoor unit PCB
NO
Install the indoor unit pipe thermistor at CN8
NO
Replace the indoor unit
PCB