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-   -   Defrost system not working (http://forum.appliancepartspros.com/refrigerator-freezer-repair/23385-defrost-system-not-working.html)

Shaye998 02-11-2009 05:03 PM

Defrost system not working
 
The Defrost system is not working, first I checked the resistence of the heating element it had 31 ohms, and it looked like the thermostat was bad so I replaced it, this did not help. Next I replaced the timer and the system is still not working, so I Rechecked the resistence of the element and it still shows 31 ohms, I can't get a resistence reading on the thermostat but I am getting about 19 volts to the plug that feeds to the thermostat when the system goes in to defrost. Is this voltage ok, is the resistence of the element ok? My next thought is to purchase another thermostat.

denman 02-12-2009 05:39 AM

Here are your parts
Model PDS22LBNBB

Is this voltage ok,
No but am not sure where you had your meter leads or the settings on the meter. While in defrost mode if the thermostat is open you should see 120 volts AC across it.

is the resistence of the element ok?
Yes, sounds about right

My next thought is to purchase another thermostat.
I assume that you are talking about the defrost thermostat.
It should measure 0 ohms when frozen. It will open at a few degrees above freezing.
Hold it onto an ice cube if you have to or put it into a cup of ice.

Shaye998 02-12-2009 11:23 PM

One lead was placed at connection of the heater element and the other lead was placed at the connection in the ceiling of the freezer where the thermostat lead plugs into. This was to bypass the thermostat and heater element.

denman 02-13-2009 08:25 AM

I would not really trust the voltage measurement, sounds like a ghost voltage.
But may be badly pitted defrost timer contacts.

I would check the defrost thermostat if it is 0 ohms then odds are good that the defrost timer is the culprit.


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