How To Troubleshoot Of The "Undetermined - Samsung AM072/096/120/144FXVAFH Service Manual

Test Operation

9-1-3 How to troubleshoot of the "Undetermined"

1) Indoor Unit Temperature sensor
Inspection item : Indoor temperature of each Indoor Unit, EVA In / Out Temperature sensor
Error code: None (The resulting report "Undetermined")
Determine the status of the Temperature sensor of the Indoor Unit installed before the compressor start.
If the judgment of Indoor Unit temperature sensor is "Undetermined" : Checking in accordance with the following order.
Blast operation for more than 10 minutes
Is deviations of the
Indoor Unit Temperature sensors, more than 10℃?
Is Indoor temperature of
the Indoor Unit by wired remote control setting?
Does Temperature sensor
connection wire of Outdoor Unit properly connect?
Is Outdoor Unit
Temperature sensor resistance value normal?
Check the breakaway
of sensor or replace PCB
Is deviations of the Indoor Unit
No
Temperature sensors, less than 10℃?
Complete
[Caution]
- If the Outdoor Unit with a history of operation (Auto Trial Operation inclusion) :
Must be carried out Auto Trial Operation after 1 hour from final operation stopped.
- If the Indoor temperature setting by wired remote control :
Carried out the Auto Trial Operation after setting the Temperature sensor of Indoor Unit.
- Indoor Unit of outdoor air introduction : Will be excluded from the Indoor air temperature, EVA In / Out Temperature sensor checking.
9-4
Yes
Yes
No
No
Yes
No
Yes
Yes
※ Resistance measurement method After
Indoor Temperature
sensor setting
(Remote control → indoor unit)
Confirmation and Measures
Replace sensor
separating the Temperature sensor connector
from the PCB, measure the resistance value
between the two terminals.
[Discharge
Temperature sensor
Resistance(KΩ)
resistance value]
Temperature(℃)
70 2.2
60 3.0
50 4.2
40 5.8
30 8.3
20 12.1
10 18.0
0 27.3
-10 43.0
Samsung Electronics