How to access/open the No-Frost System located on top of my Miele tall freezer F7462 SNH-1 ?

You can unplug the unit & open the doors. Not very friendly to all of the items in the fridge. You can accelerate thawing w/ a heat gun or hair dryer. You will need to replace the defrost timer to prevent it from re-freezing. The defrost timer is relatively easy to replace. I recommend viewing the manufacturers' website to determine location & part number of the defrost timer.

charge with detail (that is a Freon with Red dy solution to help locate your system leak) locate leak, repair using silver solder, evacuate system completely, pull vacuum down to 27" plus Lbs. vacuum, close system to hold vac pressure, monitor pressure for 30 minute or so, if vacuum hold pressure then you have successfully fixed your system leak, next hook up your system to the manifold gages assembly to a Freon supply source, all this while retainning your vacuum pressure, slowly crack open the valve on the manifold to allow the new freon to enter your system until you see pressure building up in you system, next monitor the discharge line i.e. the bigger line until you see frost extending outside of your freezer unit toward your compressor assembly, then close the freon supply valve, wait for a while to see if the frost line recede into the unit box, if it does not recede but stay out of the box or extend some more then you must must release some freon slowly a very small amount at the time until the frost line has regressed into your freezer box. this should complete your repair, good luck

check the fan and clean off the condenser

sorry no help can be provide since veteran appliance technicians such as myself has no idea what a fan delay is, since in my 30 yrs in the profession i have NEVER SEEN ONE .Now if your asking about the defrost thermostat that is located on the evap. coil is should be closed when the coil has frost on it and open when no frost is present(in a normally working freezer the coil will have frost on it except during the defrost mode ,where as the heater will be on to melt the frost) also firstly check the condenser fan motor since it should be running all the time that the compresser is on

Things you can do to cut down on frost.
1.make sure all seals fit flush to frame.
2.use a thermometer and set freezer to -18c(beef will keep upto 12months).
3.wrap all food as airtight as poss.
3.do not overfill,leave space for air flow through drawers/shelves.
4.defrost every 2/3 months in humid conditions using clorine bleach to clean interior,and dry thoroughly.(leave door open to dissipate clorine gas.)

yeah and that is never a problem

it may be that the door is open a lot witch lets in warm air that go's to the top of your freezer and turns into ice so there maybe nothing wrong with your freezer, in winter we heat the house up and close all the windows this holds in the damp air,, in the summer it should be ok, but to test it place a thermometer in the freezer is should be about -21*f or there abouts for a 4 star freezer

If is the type of freezer where the shelves are also the evaporator(shelves are very cold and is normal to frost), the fact that only one shelf is iced would indicate the system is low on freon due to a leak. This would also explain the hot walls and compressor. It requires a service man to check the freon level and locate leak and recharge.

If you want a manual defrost model they are all almost the same.
Manuel defrost is very simple, just compressor and thermostat. No fans or defrost system. The true indication of quality is the energy star rating. Look at the operating cost. The better made ones cost less to operate. Just shop by price and features you want. High temp warning, rapid freeze etc. Normally I would stay clear of the White/Westinghouse garbage(Gibson,Kelvinator, Frigidaire, etc.) in washers and dryers but in refrigeration they aren't too bad. It is really hard to tell anymore who actually makes what. They all seem to be buying each other out. GE sold out and doesn't make their own anymore, Whirlpool bought out Maytag, Jenn air, and Amana. Kenmore/Sears is mostly made by Whirlpool. I have trouble telling things apart anymore.