Defrosted coils, replaced defrost thermostat, still doesn't work properly. Refrigerator does not seem to be cooling very well either. Also notice frost buildup around coils 24 hours or so after initial defrosting. Purchased unit new in 2003
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The ohms of the defrost heaters vary, but all you really need to do is check it for continuity. If its open, its bad. The defrost thermostat must be closed for defrost to happen,it is in series with the heater the defrost thermostat opens to terminate defrost, then the timer puts the unit back in run mode. To check the defrost thermostat you have to put in in a freezer for a while then check for continuity . The actual open and close temps are usually stamped right on the defrost thermostat Its considered good practice to replace both the heater and the defrost thermostat while you are in there
If its not cooling or freezing then the compressor has to be checked.The compressor is the part which controls the cooling and freezing in the refrigerator.If the gas / refrigerant in the compressor gets low/ less then compressor will run more but it will not cool due to less refrigerant in compressor.In that case the compressor needs to be replaced.
Also it can be faulty defrost assembly parts causing this issue.The thermostat is got faulty or the heater is not turning off.This also causes every thing to get defrosted.
The defrost assembly
consists of three main parts. The defrost thermostat, the defrost heater and
defrost board. Any of the one is not functioning. When thermostat sense the
maximum cooling, it triggers the defrost heater to start heating and this
defrosts the ice collected on the coils and the system works. Both thermostat
and heater are controlled by defrost board. First the thermostat and
defrost heater to be checked, if both check ok by meter and visually, then its
defrost board causing the problem. You can get required parts from
online sites like: --- www.repairclinic.com or from searspartsdirect
Before that you can
try manual defrost reset procedure. The manual defrost
reset procedure is as follows : ----First unplug the unit from main power outlet. Then empty whole unit
completely. Then keep both the doors open. Wait for 24 hours. All the ice collected
on the coils and in the freezer section will get melted. Clean the
water from the sections. Then Connect the power cord of the unit to main power
outlet after 24 hours/.Then set the temperature to normal in both fridge and
freezer section. It will take near to 4 hours to get run in its proper cooling
cycle. Then check, if the problem returns again.Then go for replacing the parts.-------------------This should
It is normal for the coils to frost evenly all over but if it's not defrosted it will build up preventing proper cooling. After replacing your defrost components make sure the frost is being melted. The motherboard determines when to defrost based you your use of the freezer/fridge. It should defrost from once a day to once every two or three days. Is the fan in the freezer running? It won't cool right without it. It should run when the compressor runs. Are the coils frosting evenly? Uneven frost means it is low on freon and requires a tech to repair. Is the fan underneath the fridge near the compressor running when the compressor runs. If not It won't cool properly. Does the compressor ever cut off as it should when it reaches the selected temp.
Check rear wall of freezer by feel for frost. Heavy, even frost indicates likely problem in the defrost system. Unplug unit. Defrost heater (in freezer behind rear wall panel), defrost thermostat (same area-must be checked at freezer temperature) or Defrost timer-located lower back outside of unit. Near compressor. Do continuity test on heater and defrost thermostat and if they show continuity (good), replace defrost timer. If not, replace the one that tests bad.
Defrost coils fully. Reassemble.
Please let me know if I have helped with comments and rating.
Refrigerator will work about 7-10 days after being defrosted until thick frost builds up again cutting off air flow to both compartments
THIS IS A DEFROST PROBLEM EITHER THE THERMOSTAT OR DEFROST TIMER IS BAD! THE THERMOSTAT IS LOCATED BEHIND THE WALL IN THE FREEZER COMPARTMENT ATTACHED TO THE COILS TO KNOW IF ITS BAD IF WILL HAVE A RAISED SPOT ON THE BACK LIKE ITS BUSTING OPEN CHECK THAT
The defrost cycle is not working properly, there are three things involved in system. #1 Defrost timer in refrigerator #2 Thermostat on coils to tell if unit is frozen #3 heater element located under coils thaws coils when frozen. the defrost timer if it is manual < located at the front of light assembly panel in top of refrigerator there will be a hole with a plastic piece that resembles a screw strait screw head> it turns and every 8hrs aprox. it stops operations and starts defrost cycle by allowing voltage to the thermostat and if thermostat is frozen it allows power to element for thawing coils. If defrost timer is manual look for direction it is facing and mark edge to see if timer is turning< very slow turning and is easiest way> if you can get an ohm meter ohm the element on high setting< if it has continuity element is operable> check wiring just to be sure not problem. If you find the timer does turn and doesn't stay in one position over 40 minutes then the thermostat is bad.If element fails tesing then the element is bad and if timer stays in one position then it is bad. If unit is equiped with electronic defrost timer and element is good in would replace timer and thermostat to guaranty that resolved problem
It's almost always the defrost heater. If you have volts to the defrost thermostat the defrost control is working. Set your meter to check ohms and remove the wiring from the heater. If anything changes when you touch the meter leads to the heater terminals then the heater is probably good, but my guess is nothing will change, which means you've got a bad heater.
Check to see if there is any frost buildup in
the back wall of the freezer. If so, it is not defrosting as it should.
bad defrost timer/control board
bad defrost heater (in freezer)
bad thermo switch in freezer
If you don’t know what these are then unplug the machine and let the ice
melt in the freezer overnight with the door open. Then try it the next day, if
is cooling fine then you need to have a service person replace one of the above