Frost build up Jenn-Air JFC2089HTW

sounds like a bad door seal. check for debris around the door seal. that's the rubber seal going around the inside of the door.

the dampner in the center back top shelf area is not closing properly . should be replaced . this is a electric motor control dampner . . very common problem the new dampner is improved . mm hope this helps and thanks for using fix ya == ( feed back pls )

First you must fully defrost your freezer. Frost simply attracts more frost. A build up of frost large enough to prevent the door closing properly will grow very rapidly indeed and waste a lot of electricity; it will also overload the compressor and can cause it to fail prematurely.

If the seal is damaged then it will allow moist air in and cause frost. If the seal has simply become unseated, then refitting it will prevent a recurrence.

Unless you have a frost-free model, then all freezers eventually need defrosting. You can slow the process by never opening the freezer door unnecessarily and also by never leaving it open any longer than necessary. Frost free models rely on air circulation via a fan to prevent frost build up. If the fan fails, or if the freezer is overloaded and so preventing air circulation then it will still frost up.

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It sounds like a defrost system problem. A bad timer, heater or thermostat can cause frost to build up on the coils and block air flow to the refrig side. Check out ACMEHowTo.com for troubleshooting the defroster problem

your freezer is getting frost because the door is not closing all the way. Make the necessary adjustments to the door so that it gets a good seal and the frost should stop

Frost in the rear of freezer possibly caused by door staying open.  Door staying open possibly caused by frost buildup on ref door track.  Start by making sure the teeth on the freezer track are clear of ice and frost.  This should allow you to shut the freezer door.  Next check the freezer seal.  If it is not completely sealed it it will build up frost. It is also possible that the frost in the rear of the freezer is from a failure in the defrost cycle as the evap coils are at the back of the freezer. If this is the case your refrigerator is probably getting warmer.  

As a suggestion:
Check the trap door that opens and closes each time you obtain ice cubes. The water leakage may indicate a damaged seal allowing air from outside to enter. This will cause increased frosting and blockage.
The trap door may not be closing all the way or the magnetic seal around the freezer door may be damaged or not sealing completely.

You may also need to check the thermostat.
Temperature may be set too low. If you make an adjustment allow the unit to stabilize for 12 hours before attempting another change.

Good luck!

Check for door gasket,for leaks.

there is a small electric heater along the door gasket where you see the frost building up, this heater has apparently stopped working. this will also cause the door to pop open due to a poor seal. feel around where the door gasket contacts the refrigerator and it should feel a little warm. if not then a service company can replace those heaters. should not be too expensive.

If the ice build up is only on the back panel of the freezer then you have a defrost problem. Most likely a defrost thermostat or control board/timer. If frost build up is around the walls of the freezer then warm air is getting into the freezer. Most likely cause of this would be gaps in or torn door gasket or door alignment. In some cases the door was left cracked open. If gasket and door alignment is ok remove the frost and see if it comes back.