Automatic defrost no longer works

Hi, typically it requires holding the freezer power and super frost button at the same time for about 5 seconds.
Different fridges then have different options by using the freezer control up arrow. When you press the up arrow, the display changes. Initially it should show 'd' - for demo mode on/ off. Other potential options are H ( manual defrost), L (test functions) and E (reading sensor info). You will need specific manual info for your specific fridge to know the detail of what you can do. Generally, similar fridges have similar options, so a close model may give you the needed info. Hope this helps.

Is the fan working, If it does could be a roblem with defrost cycle or the defrost heater faulty, causing ice buildup.

HI.SHOT IN THE DARK.try defrosting all first.check if freezer has ice build up.might work after defrosting.if it frosts up again after a few days i would suspect t/stat heater or sensor hope this helps ali

The defrost timer sticks in defrost mode and then comes out of it. I've been out of the service industry long enough to not be able to tell you on your model where it is located. Defrost timers on frost free refrigerators are a very common problem.

Really when the fridge frost very excessively there is less cold.
You have to regularly set up defrost setting if your fridge has automatic defrost.
Or your fridge has manual defrost then defrost it twice a week.
To minimize excessive frost, set the temp control setting to just mid- position.
Good luck.

Provided that the fridge is not working too much frost this action takes place automatically in the fridge according to a time scale. This is the auto defrost timer and it is needed in all the no frost fridges. In the older models it is up to you to defrost when the freezer gets frosted and clogged.

As you had done switch off the fridge. now after the frost had cleared off , keeping the fridge a little away from the wall switch on. But only after you have checked for the thermostat to be set to normal, the fan working fine as well as the timer switching on the auto defrost. So look out for the compressor to shut off when the thermostat reaches the limit, if this wont work then the ocmpressor will run and result in heavy frost. so it can be that the wires to the thermocouple is broken or damages due to frost. so you can open freezer compartment and confirm on inspection of the wiring for any breaks.repeat if frost appears till you correct and confirm. If you are calling a repairman keep this mind so as to get an idea of the work, to have an estimation of the work. Hope you try this out. Good day

I left the fridge closed for 12 hours after cleaning and the back wall is now frost free.Great!! Lynn

It should still be covered under the warranty.

How to check everything
http://www.acmehowto.com/howto/appliance/refrigerator/refrigerator.php
check defrost timer, defrost heater, defrost thermostat. In most newer models the timer has been replaced by an electronic control board. If the heater and thermostat are ok it’ll be the control.

You can turn the defrost timer till it clicks and everything shuts down. The heater should now come on. If it does, replace the timer. If it doesn't, check the heater and defrost thermostat. Turn the timer again till everything starts back up to end the defrost cycle.

Try these solutions in these order:
1. Switch off the fridge and leave the door open overnight. Switch it back on in the morning.
Explanation: The sensor inside the fridge gets frozen and cannot control the temperature properly.
2. Switch off the fridge. Unplug it. At the back of the fridge (behind the unit, not inside) there is a large grid. Clean it with a hoover thoroughly. Open the fridge. Dry the back of the fridge if wet (inside the fridge). If frosted wait for it to defrost and then dry it. Plug in the fridge. Switch the fridge back on. This one worked for me.
Explanation: The dust in the grid deprives the fridge from cooling down and the unit can't control the temperature in the fridge section.
3. Switch off the fridge. -Unplug it. Empty it. Turn it upside down. Plug it in. Switch it on for 24 hours. Switch it off. Unplug, return to normal and switch on.
Explanation: This has to do with the pressure of the gas inside the compressor. I have not tried it but this advice as given to me by a qualified electrician when I commented the (in)famous F2 problem in Liebherr fridge/freezers.
Hope it helps. Regards. Albert