If you are experiencing a F20 code on your Fisher Paykel refrigerator, you will hear a constant beeping sound when you open the frig door. This error code means there is a broken wire on the top of the door hinge (usually left side). If you are even a bit handy, A simple solder job is the fix and can save you an expensive home repair service call.
Check the wires under the hinge cover on the top of the door, Lift the plastic cover and you will find one of the wires is broken, You may need to look carefully to find the break. If you want a long term fix cut a section of the wires out (making sure the fridge has been unplugged) and solder & heat shrink a new section of flexible good quality wire in this area making sure the solder joints are far enough away so the movement is not working the joint.