Every 3 min fridge makes a noise as if it is trying to defrost
Noise can come from these areas:
The inside of the freezer
Self-defrosting refrigerators use a circulating
fan to move the air through the freezer and refrigerator compartments.
This fan runs whenever the unit is cooling. The fan is located in the
freezer, as follows:
If the freezer is on top, the fan is on the back wall,
near the top or bottom, in the center of the freezer.
If the freezer is on the bottom, the fan is on the
back wall, near the top of the freezer.
If the freezer is on the left, the fan is on the back
wall, halfway up or near the top.
Over time, the fan may become noisy--usually
making a chirping or squealing sound, though it may make a loud groaning
noise instead.
To find out if the fan is causing the noise, just
open the freezer door and push in any fan/light switches. If the noise
is louder when the door is open, the evaporator fan motor is the cause.
You can't lubricate or repair this motor. You must replace it.
The outside back of the refrigerator
There are three components on the outside back of
the refrigerator that may become noisy: the compressor, the condenser
fan motor (if self-defrosting), or the defrost timer (if
self-defrosting).
The compressor is a football-sized case with no
apparent moving parts. You can see it on the outside of the refrigerator
at the back near the bottom. It is usually black and has black or
copper-colored tubes and various colored wires attached to it. If the
compressor is the device making noise, there is probably no repair that
will reduce the noise. You will have to replace it--which can be quite
costly.
If the condenser fan is making noise, there may be a
build-up of lint or other debris on the fan blade. The fan is located
near the back of the machine, sometimes behind a thin panel. To clean
it, first unplug the refrigerator, remove the thin panel, and use a soft
bristle brush to clean it. If there is no lint build-up or debris on
the blade, you will have to replace the motor.
The defrost timer is often located at the bottom of
the refrigerator, near the front and behind the kick plate.
Occasionally the electric motor inside the timer may become noisy. The
timer must be replaced to solve this problem.
The bottom of the refrigerator
Noises detected at the bottom of the refrigerator
almost always originate from the back of the refrigerator. However,
sometimes the drain pan under the refrigerator will rattle. You may
need to tape the pan in place to stop a rattle. Also see the “Outside
back of the refrigerator.”
If there is noise of the fan rubbing with the frost build up on the freezer then it is confirmed that the defrost timer is faulty. Now shut off the fridge and leave it powered off while you clean and check the evaporator for frost.
Earlier make sure that the thermostat was set to normal mode for freezer and fridge.However if ice forms in the freezer then observe the fridge for about 24 hours for cooling to continue and the fridge to cut off . If not the auto defrost timer, or the thermostat must be checked. Frost formation without defrosting could block the air flow and so shut the air passage to the fridge. Also the blower fan must work and if this is not working then the fan can be faulty. Also a fault on the control unit is a suspect to non functioning of any one of these components.
If defrost timer works but frost keeps forming check while the compressor shuts if the heaters are working, check continuity of the heaters.
So try this test using a multi-meter on the defrost timer and the thermostat and make your observations so that we come to the solution.
Please check the link below for tips to remove the panels/parts:
http://www.espares.co.uk/advice/fridges-and-freezers/a/2
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