Samsung IDH1800E Service Manual page 87

Trouble Shooting
EC07 : When the trouble is found in the communication related part between outdoor
unit pipe thermistor.
- ED of 7-segment of outdoor unit PCB.
- Reservation lamp and filter lamp of wireless receiving board is flickering with 1Hz.
- Action item when "D" displays on the wired remote controller.
Check point :
- Indoor unit pipe thermistor available or not
- Indoor unit PCB defect
Is indoor pipe thermistor installed at CN41?
YES
Is the voltage across the thermistor 4.9V and higher
or 0.5V and lower?
YES
Replace the thermistor
"*" stands for the indoor unit address.
6-8
NO
Connect correctly and check.
NO
Replace the outdoor PCB
Samsung Electronics