Question about LG Refrigerators
The defrost is not working. The defrost heater ohm reading on 1K is infinity, the ohm reading on 10K is 1, the reading on 100K is 3 ohms. The Sensor-and-fuse combo both show continuity. I can't find the defrost timer to turn it on to check if 110 volts is getting to the heater plug.
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Posted on Jan 02, 2017
As I said; the fan and compressor run fine but I cannot find the defrost timer. Is it integrated into the control board.
Posted on Jul 30, 2008
SOURCE: Defrost heater wont heat up
so you seems to have done your homework. all the inputs are great.
you said you have 206 volts at the heater connection prior to connecting the heater.
and would become zero once the heater is connected.
so you have a loose connection from the timer to the defrost thermostat then to the heater.
does the defrost thermostat you are talking about is the same as the bi-metal that we used to refer in our technical language.( it is the part that would open up as the temperature inside the evaporator rises to a certain level.)
because if you are referring to the fridge thermostat which controls the compressor. ( this is also 0 ohm when closed), then the problem could be in your bi-metal.
this is the part in between the timer and the defrost heater.
it terminates the power once the temperature of the evaporator coil is about 5 degrees Celsius.
here's what you can do.
run the fridge for a day ( so that we would be sure that the bi-metal is close) then put the heater in place, turn the timer to heating mode by turning it slowly.
then place the test leads across the bi-metal, if you can measure 220 volts then that is the problem.
it is not shorting out even with a freezing temperature. you can further test the system by putting a jumper wire between the bi-metal and you heater should be heating up now.
tnx 4 using fixya,
Posted on Oct 31, 2008
The next step would be to unplug the refrigerator and remove the rear panel and defrost so that you can unplug the defrost heater on one end and check the continuity. 305175 Defrost Heater and defrost thermostat Part number 3489. If you change the defrost heater you should also change the defrost thermostat. Let me know the results. Remember above 60 degrees the defrost thermostat will show open with your OHM meter. Sea Breeze
Posted on Aug 15, 2009
The main Pcb as well as the defrost thermistor are in the circuit as well.
The thermister is attached to the evaporator with wire ties and connects to the roof of the freezer behind the fan assy.
I have seen the thermister connector pull out of the connector at the top of the freezer beacuse the wires were to tight. Remove some of the wire ties and reinstall the connector.
Posted on Jan 17, 2010
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