Everything appears to be somewhat clean in the back of fridge.
If your fridge is not designed with an automatic de-icing function, then there may be an ice dam blocking the cold air from moving from the freezer to the fridge. I had a fridge once that would get blocked with ice even if the rest of the freezer was ice-free.
Unplug your unit (often shutting off the breaker is easier than digging behind the fridge for the plug).
Pull everything out of the freezer and put it in a box. Cover the box completely with blankets to insulate it so your food doesn't thaw and spoil. Prop open the freezer door and let any ice accumulation melt.
Once everything has thawed out, wipe up the water and plug the unit back in. You should be able to tell after 10 minutes or so whether the fridge is getting cooler or not.
If there is no cooling
at all on the fridge section but the freezer works then it is confirmed that
the compressor and gas pressure is OK. Now shut off the fridge and leave it
powered off while you clean and check the evaporator for frost. If frost is
seen it is a good indication as the compressor is working with sufficient gas
within.
Now after about 6 hours plug in the fridge to start. Observe cooling to happen
in about one hour and ice to from under three hours.
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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