How to replace lightbulb refrigerator national nr-b420t

La ville de Peshawar

need to replace door gasket also see if fan running in freezer

defrost timer is located at the back of fridge,doesnt look like a clock but it is,can turn it manually if it is mechanical if its electronic replace it.

hi wich gas is use in NR-B33E2?

what you are looking for is not a belt but a door seal
it is available from the manufacturer or service agent for the make
there may be door seal retailers that can make seals to suit your door on site ( mobile operators--using names such as seal-a fridge etc))
going google and typing in--- service agents for national refrigerators in ( your location) will get you an address and phone number
mostly any fridge /freezer repair shop will be able to suggest where to get the seal from

Hi, To acess the light. Remove the plastic cover over light carefully. Replace bulb and your good to go.

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Since there is cooling on the freezer the fault can be the defrost timer. So shut off the fridge and leave it 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 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.
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 from the outside and make your observations so that we come to the solution.

the defrost timer have a motor inside it......it act as a watch, in every 8 hrs it defrost if the problem lies in it than you need to replace it as because it is not repareable