Fisher and paykel e521t icing issue

Either, the defrost timmer has had it, or the freezer defrost element has failed, the element is the most common cause of this type of problem. You have ice build-up in the freezer cores because it cant defrost, all frostfree units rely on cold air from the freezer to blow into the fridge, if the freezer cores become blocked, air can not pass to the fridge side. I bet you, if you left the unit off for 2 days to defrost totally,,,,with the doors open...then plugged it back in, it would work like new for 2 weeks.
Timmer or defrost element needs to be replaced...do not fall for the trick that the fridge mech. has to take it away, you tell him that this is the problem and you will save yourself ALOT of cash.

Dont forget to vote for the solution...regards Russ

try to clean the drain of your unit maybe it is clog up declog it to avoid drip. u said that ther is a build up of ice this means auto defrost not activate try to chek the defrost heater or defrost timer if have the unit this. or try to allign the door gasket possible theres a gap entry of outside air cause of build up of ice. bec it is came from moisture of air out side or avoid to much door opening.goodluck.

Low refrigerant assuming the compressor is always running and not being shut down by the thermostat.

You can hook up an ammeter to the unit to see if the current consumption is below spec, another sign of low gas situation since the motor is not working as hard as under normal conditions.

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check door seals, also check vent direction, a dial or lever in fridge, it adjust how much air goes to fridge and freezer

It may be a symptom of air entering to the freezer, so the seal may have issues. Another possible cause if the ventilator in the freezer is not working anymore. It depends of the Fridge model number that you have.

check door rubber,if is oblate heat it with fan,if it is ragged change it.

There is a defroster built into the ice maker to melt the ice a little around the edges before dispensing on most ice makers it may need replacing.

below the evaputator coils should be some type of pan or drain system ... the drain most of the time is in the middle of the pan... it you see anything with ice defost should be NO ice in there .. can use hair dryer once defrosted u should look for some type of drain whole.. once u think u got drain open pour small amount of hot water down to help clean and test if drain is open

I looked at the BACK at the bottom underneath of my Sears Kenmore frost free upright freezer and what was causing the ice buildup was very simple. At the factory, the assembler looped the little hose too high and when the water went into the hose it could not get out due to being too high in one spot! An ice dam will form, blocking ALL water coming through
and freezing up any more water coming down giving you a HUGE wad of ice that is scary!!! I just removed the screw holding the loop that holds the hose and put a bit of warm water down the little hole on the INSIDE (Behind the grate) to melt the remaining ice in the tube.You need to take out 4 screws and remove the grate to see this. I could not believe that this was the problem! I haven't had any ice build up since.Now don't tear your freezer apart before you try this trying to fix the compressor, thermostat etc. It may be the only thing wrong with it!