Berdan
Premium Member
- Model Number
- RS277ACPN
- Brand
- Samsung
- Age
- More than 10 years
My Samsung RS277ACPN refrigerator is not performing defrosting and the condenser coil ices up until refrigerator no longer cools.
The question that I have arrived at is: Does the operation of the forced defrost function have a dependency on any temperature sensor input or other input that would prevent it from going through the defrost cycle? Any help is appreciated.
My troubleshooting to date is below.
Problem: Refrigerator condenser coil keeps icing over. Refrigerator defrost cycle is not occurring
I Replaced Refrigerator Defrost Temperature sensor as it was out of spec at room temperature (measured over 50Kohms).
I Measured Refrigerator Defrost Heater/Thermal switch resistance at control board connector to be 92.8 ohms so heater circuit appears to be good.
When self diagnostics are run (Hold Power Freeze and Power Cool for 8 seconds) The display blinks twice and then goes back to normal display. So no LED segments are held to demonstrate other problem.
At power on of the refrigerator I see 120V briefly on the white wire (R-DEF-HEAT) at the control board connector and current is drawn through the heater briefly co-incident with a relay click. So I know that the heater control circuit is working.
However when I go into the forced operation function and select forced refrigerator defrost the heater voltage comes on very briefly and shuts off.
I did resistance measurements of the temperature sensors disconnected from the control board while the refrigerator was off but still cold. I estimated the temperatures based on a chart I found on internet so hopefully they are correct.
F Defrost Sensor 17.64 Kohms ~20 deg F
R Defrost Sensor 27.26 Kohms ~ 1-2 deg F (this makes sense because there is ice build up around sensor)
F Room Sensor 16.9Kohms ~22 deg F
R Room Sensor 10.35K ohms ~48.2 deg F? (this does not make sense as room ambient is 65-68 deg). I assume this is the sensor at the top Freezer door hinge cover?
The question that I have arrived at is: Does the operation of the forced defrost function have a dependency on any temperature sensor input or other input that would prevent it from going through the defrost cycle? Any help is appreciated.
My troubleshooting to date is below.
Problem: Refrigerator condenser coil keeps icing over. Refrigerator defrost cycle is not occurring
I Replaced Refrigerator Defrost Temperature sensor as it was out of spec at room temperature (measured over 50Kohms).
I Measured Refrigerator Defrost Heater/Thermal switch resistance at control board connector to be 92.8 ohms so heater circuit appears to be good.
When self diagnostics are run (Hold Power Freeze and Power Cool for 8 seconds) The display blinks twice and then goes back to normal display. So no LED segments are held to demonstrate other problem.
At power on of the refrigerator I see 120V briefly on the white wire (R-DEF-HEAT) at the control board connector and current is drawn through the heater briefly co-incident with a relay click. So I know that the heater control circuit is working.
However when I go into the forced operation function and select forced refrigerator defrost the heater voltage comes on very briefly and shuts off.
I did resistance measurements of the temperature sensors disconnected from the control board while the refrigerator was off but still cold. I estimated the temperatures based on a chart I found on internet so hopefully they are correct.
F Defrost Sensor 17.64 Kohms ~20 deg F
R Defrost Sensor 27.26 Kohms ~ 1-2 deg F (this makes sense because there is ice build up around sensor)
F Room Sensor 16.9Kohms ~22 deg F
R Room Sensor 10.35K ohms ~48.2 deg F? (this does not make sense as room ambient is 65-68 deg). I assume this is the sensor at the top Freezer door hinge cover?
