Question about Refrigerators
I have never even seen an Ariston ice box. If that is one that has seperate compressors for fresh and freezer compartments then you must have a bad sensor. Never assume you need a control board until you have replaced those. If the unit has a single compressor then I would imagine you have a bad control damper. These dampers open and close according to fresh food compartment temperature. Yours is most likely stuck in the open position.
Posted on Feb 14, 2010
The evaporator coil behind the cover on the back wall inside the freezer will ice up under normal conditions. Every 8 to 10 hours for around 20 minutes the defrost timer (or in most newer models the electronic adaptive defrost control) will turn the defrost heater on to melt the built up ice. There is a defrost thermostat which prevents the heater from overheating the freezer by breaking the heater circuit when the temp reaches close to 32 degrees F. The entire cooling system shuts off during the defrost cycle and starts back when the timer advances through the cycle.
If this ice is not melted it will continue to build up until the air can’t flow over the coil to circulate the cold air through the freezer and into the fridge. The temperature change in the fridge is usually noticed first followed by the freezer.
If the defrost thermostat is bad, it can prevent the heater from coming on OR it won’t turn the heater off when it gets too warm. It is clamped to the evaporator coil at the top to sense the temp. If it appears to be misshapen it is bad.
With an ohm meter it should show continuity when cold and none when warm.
You can also bypass(disconnect the two wires plugged into it and twist them together) the thermostat to see if the heater comes on then. If it does then you know the thermostat is bad and needs replaced.
The defrost heater is located on the evaporator. It is in a tube which is at the bottom and can also go up the sides of the evaporator. On some types you can see a burnt spot if it’s bad. With an ohm meter it should show continuity from end to end when disconnected from the wiring in the freezer. You can also test the wiring for voltage when it’s in the defrost mode.
If you have a defrost timer you can test it. It can be located under the fridge behind the kick panel on the front. Some are in the fridge with the controls at the top. You can turn the defrost timer till it clicks and everything shuts down. The heater should now come on. If it does, replace the timer because that means the timer is not running. If it doesn't, check the heater and defrost thermostat. Turn the timer again till everything starts back up to end the defrost cycle.
Posted on Feb 09, 2010
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Posted on Jan 02, 2017
Tips for a great answer:
First some fridge 101, the refrigerator/freezer models cool by directly refrigerating the freezer section and the refrigerator section is cooled when "some" of the cold air from the freezer is directed over to the refrigerator side (typically by a fan) to keep food fresh and not frozen a temperature controlling damper opens and closes to regulate the temperature of the fridge by introducing more or below freezing air into the cabinet. In older models where the freezer was on top the air simply "gravity" drained into the refrigerator cabinet, if the food was too cold you turned the fridge knob up and less air sank from the freezer to the fridge, simple but effective.
When you adjust the temperature level it controls the freezer temperature and this turns the compressor on and off to keep the food frozen. There is typically a knob or lever and some even have electric dampers that open and close to direct more or less air from the freezer and direct it to the refrigerator cabinet based on your temperature requirements.
Now that you know how it works there are a couple things to check. If the condenser coil is plugged with dust the internal system pressure will rise and in some cases make the fridge an over achiever and can chill too much so check/clean the condenser coil. Check the freezer temperature control and turn in up, also make sure the fridge temperature control setting is not set too cold.
Finally as the temperature changes around the refrigerator it will have an effect on the inside of the fridge too so expect to turn it up and down as the environment changes, down in the summer and up in the winter.
Hope the novel helps to resolve your issues.
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