Ice and frost

An ice build up around the top of the door aperture isn't unusual due to some cold dense air from inside will spill out when the door is opened to be replaced with humid lighter outside air that will tend to remain at the top for a while.

Being frost free doesn't exclude it from this type of ice build up as only ice formed over the evaporator during a cooling cycle will be melted by the defrost heater.

Persistent localised ice build up could be a sign of failing insulation but this will be marked by a cold spot on the outside of the cabinet.

If this is an automatic defrost or "no-frost" freezer and it has developed a lot of frost and ice, call a repairman. That should never happen.

But if it's a manual defrost model, follow this procedure.
1. Turn off the freezer. Then remove all the food and toss it into a picnic cooler to keep it frozen. (Some blue ice packs will help.)
2. Open the drain on the bottom of the freezer, and put the end of the hose from the drain (which most have) into a roasting pan to catch the water from the melted frost.
3. Leave the door open. If you have a small electric space heater, blow warm air into the freezer to speed up the melting process.
4. Don't scrape the ice -- you could puncture a cooling coil in some units, making the freezer useless.
5. In about 30 or 40 minutes (15 with the space heater) the ice will be melted.
6. Dry the interior with a towel, toss the food back in, turn the freezer on again, and you're done.

You need to replace the door gasket. It's leaking air causing the frost.

get down on the floor and look along the bottom of the door to make sure that the door seals are touching.if not and you have an air leak it will cause frost.if its ice and not frost then check all vents/drains are clear.

Frost Free Freezer have an automatic defrost, which is essentially a heating element which melts any ice. If your door seals are in poor condition or something is preventing the door from sealing the ambient air may be melting the ice more than the drain can accommodate. Check the drain in the bottom of the freezer. Humidity can also cause more water to accumulate, especially if the door seals are not sealing.

Frost free does not mean no frost ever anywhere. It just means that there is a mechanism to defrost the evaporator on a regular basis. If there is a spot where frost is forming in the box it may just mean that a little bit of moisture that is not collected on the coil may be finding another cold spot to stick. The area where the fan blows into the cabinet is bound to be the coldest spot in the freezer therefore an ideal place to collect frost. Check the level of the unit and your door gasket to be sure the door is closing tight and true.

first just take it out and clean that one carefully .And then set correctly and observe it,s working condition.then also it's not working means show it to ur near by worker those who repairs it

The door seal is at fault. Regardless of the small tear it is not sealing well.
Take a dollar bill and close it in the door. Then pull on the bill to feel resistance.
You will find it pulls easily in some place. That is where your air leak is that is causing the condensation.
Do this about every 6 inches all the way around the seal.

That is normal. The refrigerant runs through those shelves. They are the evaporator side of the unit.That is where the freezing effect comes from.
Check door seals for leaking air.
Keep door openings to a minimum.
Get in there and get out.
Those things will help prolong frost/ice buildup.

IS IT ICE OR FROST? IF IT IS ICE, THE DOOR MAY HAVE BEEN LEFT CRACKED OPEN.
IF IT IS FROST, IS THIS A FROST FREE FREEZER?
IF YES, IS THE FROST ON THE BACK WALL?
IF YES, THERE IS A DEFROST FAILURE AND YOU WILL NEED TO TROUBLESHOOT THE DEFROST CIRCUIT.
IF THE FROST IS ON THE FOOD OR AROUND THE DOOR OPENING, A SEAL LEAK HAS ALLOWED WARM MOIST AIR INTO THE FREEZER AND CREATED THE FROST. CHECK THE DOOR SEAL FOR A GAP WHEN CLOSED.