What are the reasons behind “refrigerator not cooling”
Nothing can be
worse that a broken refrigerator on a hot summer day. If your refrigerator does
not cool properly, it indicates that something has gone wrong inside which
cooling is difficult to fix and most of the time require a refrigerator repair
expert to identify the root of the problem.
reasons behind refrigerator not cooling problem are:
- Frosted evaporator coil:
There are evaporator coils and circulating fan in the freezer zone of a
refrigerator. Poor cooling can be a result of excessive frost development on
the evaporating coils of your refrigerator. Over time frost accumulates over
the coils and fan. When frost collects over evaporator coils, they get
insulated. Due to this the circulating fan is unable to draw air over the
frosted coils. There may still be a small amount of cooling because the frost
over the coils, but with no air flow over the coils. This frost should be
removed by manual defrosting or automatic defrost (in frost free fridge) for
proper cooling inside refrigerator.
- Faulty evaporator fan: Another
common reason of refrigerator not cooling properly is a defective evaporator
fan. The fan circulates cool air from the freezer to other compartments inside fridge.
When evaporator fan stops working it cannot circulate cool air inside the food
section. Due to which the freezer continues to be cold but food section of your
refrigerator does not cool.
- Out of order defrost system: In any frost free fridge there is a defrost system which controls
the cooling and defrost cycle. The components of the defrost system are: a defrost
timer and a defrost heater:
- A defrost timer
switches the refrigerator between the cooling and defrost mode. If it goes bad
and stops at cooling mode, it causes excessive frost to build up on the
evaporator coils which reduces the air flow. Or when it stops at the defrost
mode it melts all the frost and does not go back to the cooling cycle. A broken
defrost times prevents the refrigerator from cooling efficiently.
- A defrost heater
melts the frost developed over the evaporator coil. But if it goes bad frost
does not melt and excessive frost accumulates on coils reducing the cool air
flow inside the refrigerator.
- So when either
of the 2 become faulty, the fridge does not understand when to cool and when to
- Faulty compressor: The
most common cause of refrigerator not cooling is a faulty compressor. A
compressor is the heart of refrigeration cycle. When it does not work properly,
the entire cooling process of your fridge does not even start. The job of the
compressor is to compress the refrigerant from a low pressure cool vapor into
high pressure hot vapors. This compressed refrigerant in the form of hot high
pressure vapors then flows through the condenser where it get condensed into
high pressure liquid. This liquid then flows through the evaporator coil where
it evaporates and cools down to a low pressure vapor. Air flows over the
cooling coils and keeps the refrigerator cool. So when the compressor is out of
order, this refrigeration cycle does not even start and your refrigerator does
- Insufficient refrigerant level: In a fridge, if compressor is the heart, the refrigerant is the
blood of the cooling cycle. Refrigerant leakage or under limit refrigerant also
effects the cooling inside the refrigerator.
- Dirt insulated condenser coils: Dirty condenser coils prevent refrigerator from cooling properly. In
a refrigerator when high pressure hot refrigerant condenses in the condenser, a
lot of heat is dissipated. But when the condenser coil is dirty and loaded with
debris, heat does not flow out of the coils properly. This heat stays inside
the refrigerator and reduces the cooling.
- Defective condenser fan:
In your refrigerator there is a condenser fan that forces hot air out of the
refrigerator. So when it goes bad the hot air cannot be released into the room
and remains inside the refrigerator. Because of this the temperature inside the
refrigerator shoots up. A faulty fan motor or defective fan blades prevent the
condenser fan from working properly.
- Defective start relay: Refrigerator
not cooling can be caused by defect in small parts like start relay and start
capacitor. In a fridge there is a start relay. It is a small device located
near compressor. It helps compressor in starting up. If the start relay is
defective, then the compressor does not start and the cooling process in the
refrigerator does not commence. There is a start capacitor that gives boost to
the compressor to start up. If this capacitor is burned out, the compressor
might not start up and the refrigeration cycle will not commence and
refrigerator fails to cool.
- Faulty thermistor: A
thermistor is a sensor that control the air temperature inside refrigerator and
controls the start and stop of cooling cycle. If it goes faulty, then the
refrigerator does not cool at all or cools continuously.
These are some
common reasons behind refrigerator not cooling problem but there can be other
reasons as well.
What is included in the service?
The PRO visits
client’s site and troubleshoots the problem of refrigerator not cooling. The
PRO looks for all possible reasons behind fridge not cooling like dirty cooling
coils, insufficient refrigerant level, defective key components of fridge like
compressor, condenser, coolant, thermistor, start capacitor, sensor and others.
After the actual problem is identified, PRO describes the problem to the
customer and suggests a possible repair or replacement. On customer consent,
the PRO repairs the fridge.