Tip & How-To about Refrigerators
5 reasons for fridge and/or freezer getting warm:
1- the evaporator coils are icing up and won’t let air circulate.
2- the evaporator fan is not working to circulate air.
3- there is no refrigerant in the system.
4- no power to fridge or compressor.
5- the condenser coils have no air circulation
check under the fridge behind the vent. if it is too dusty or the fan isn’t working, it is not getting enough airflow to cool down. replace fan and/or vacuum out the dust.
if there is no power to the fridge, the light will be off. if the compressor is not running, there is a defrost timer that cuts the power temporarily to the compressor to melt ice on the coils. it’s located under the fridge behind the bottom vent. If the timer is off and the compressor is not going, the compressor or the main board is bad and needs replacing. there is also a temperature sensor on the evaporator coils that tells the defrost coil to turn on and when to turn off. if the defrost timer is on but the coil is not heating up, replace the sensor. if it still won’t heat up, it’s the timer or the coil.
the easiest way to tell if there is no refrigerant- the freezer wall is warm and the compressor is loud. if there is no refrigerant, it may be more cost effective to replace the fridge.
if you feel no air coming from the freezer vent, the fan needs replacing. If you feel air moving in the freezer but not the fridge, the channel from freezer to fridge is blocked.
if the freezer has air and the rear freezer wall has frost on it, the evaporator coils are iced up and need defrosting. causes:
1. low refrigerant
2. no fan
3. too much humid air in fridge/freezer due to door open or bad door seals
4. the condensate drain tube is clogged
5. defrost cycle not functioning properly
if the seal around the door is ripped or not completely sealing, or there is condensation at the bottom or the walls of the fridge, replace the seal(s).
no air, no fan. Replace
if the refrigerant is low, it just needs a top off. but you need to be certified by the epa to move refrigerant, so get a professional.
there defrost cycle starts with the timer. at a certain time of day for a specific time, the timer turns the compressor off and turns on the heater element located at the bottom of the evaporator coil. this stays on until the coil temp sensor reaches a certain temperature to let the timer know that the coils are defrosted and turns off the power to the element. the defrosted water drains to the condensate pan. if the timer is bad, it will never go into defrost, or never get out of it. if the element is bad, the coils will never defrost. if the temp sensor is bad, it’ll go into defrost, but it will either tell the timer that it’s always frozen or already defrosted, resulting in the element never turning on (stays frosted) or never turning off (eventually burning out the element).
Posted by jasbo on
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