Tip & How-To about Refrigerators
Do you see frost built up on back wall of freezer?( what happens when it does not defrost is ice build up in the freezer and blocks cold air from flowing into the fresh food compartment) if so it is not defrosting, and this is what needs to be checked, remove back wall of freezer and check these;
Defrost heater-- it usually is at bottom of the evap. coil, to check it remove wires to it ,use a meter set to the lowest ohms setting and check for somewhere between 10-50 ohms if that is what yours, is its good, if meter reads OL replace defrost heater
Defrost thermostat-- it clips to the top of the evap. coil and is metallic,round , about the diameter of a quarter with a plastic side with 2 wires coming from it(do not confuse it w.thermister),remove wires and check for ZERO ohms WHEN TESTING IT MUST BE COLD so check it when frost is built up,IF meter reading is OL (WHEN COLD) its the problem
Defrost timer or defrost control if has digital display to show tempature
check timer(it could be anywhere except in freezer) by turning till you hear a click,the defrost heater should come on within 5 minutes if the heater does come on the timer is the problem and needs to be replaced,if the heater does not come on the above mentions parts (heater/t-stat) will be the problem.
defrost control is hard for unskilled lay persons to check SO IF heater and defrost t-stat are good replace control
Hope this helps you to figure out what is wrong with your refrigerator,
Posted by Gene Meier on
Feb 23, 2011 | Refrigerators
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