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owensjon  
#1 Posted : Monday, February 6, 2012 10:40:33 AM(UTC)
owensjon

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Freezer is cold but iceing up, when do I test the defrost thermostat for cont.?, I've tested the element At 200 ohm, or am I heading in the wrong direction? Thanks Jon
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denman  
#2 Posted : Tuesday, February 7, 2012 5:35:18 AM(UTC)
denman

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Here are your parts
Replacement parts for General Electric CTX18GICDRWW Refrigerator | AppliancePartsPros.com

Yes you are headed in the right direction.
I am going to assume that the evaporator fan runs when the compressor is running.
Also that if you manually defrost it that the unit runs OK till the evaporator coils clog up again with frost/ice.

First remove the evaporator cover in the freezer so you can see the coils.
Do not let them de-ice.
If they are heavily iced/frosted over you have a defrost problem.

If yes.
Manually force a defrost cycle by turning the defrost timer cam (Item 648 in Section 5) till the fans and compressor turn off.
There is usually a hole in the cover to let you do this.
Now check the defrost heater to see if it is on.
Be careful you do not want to burn your fingers.
If the heater is on then the timer needs replacing, re: it is probably stalling during it's rotation so is never getting into a defrost cycle.

If not on.
Unplug the unit.
Remove the wire for one side of the heating element (Item 618 in Section 5) from the wiring and measure it for continuity.

If the heater is OK
Remove one wire to the defrost thermostat (Item 620 in Section 6) and measure it, should be 0 ohms when frozen. Note that it opens just above freezing so must be frozen to check it. Also inspect it, if it is bulged at all replace it even if it measures OK.

If both the above are OK then odds are the defrost timer contacts are toast.
Best way to test this is a live test to see if you have 120 volts across the heater/defrost thermostat combo.

Your element reading seems high as this would work out to a 72 watt heater.

If you do not own a meter, I would suggest you purchase a one. You can get a decent digital multimeter for under $20.00. You do not need fancy though it is nice if the leads are a couple feet long.
If it saves ordering one unnecessary part it has paid for itself and you end up owning a useful tool.
Most places will not let you return electrical parts so if you order it, you own it.
A couple things to watch when measuring ohms and continuity
1. Always remove power from the machine otherwise you could blow your meter.
2. Always disconnect at least one side of any device you are checking. This eliminates the possibility of measuring an alternate/parallel circuit path.
3. When checking for closed contacts and continuity use the lowest scale (Usually 200 ohms). Then try higher scales. This scale is 0 to 200 ohms so if the device you are measuring is 300 ohms this scale would show an open circuit which it is not, you are just measuring outside the scale's dynamic range.

There is a good STICKY at the start of this forum about it's use.
owensjon  
#3 Posted : Tuesday, February 7, 2012 10:09:54 AM(UTC)
owensjon

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Posts: 2

Originally Posted by: owensjon Go to Quoted Post
Freezer is cold but iceing up, when do I test the defrost thermostat for cont.?, I've tested the element At 200 ohm, or am I heading in the wrong direction? Thanks Jon



Thanks denman, Have ordered parts. Jon:) :) :)
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