Thanks for your advice . The unit is off, fan has been taken out and awaiting replacement Freezer Motor Fan, that is what I have been told ( by repairers that I I engaged and i thought were very prompt in diagnosing and fixing such problems ) could be the problem. I have also been told that there are no guarantees that once the fan is replaced, the fridge is going to work or not. Initially I was told it is the sensor was the problem, then I was told it is the FAN . I am not sure what is next . I have taken the matter up with the company that I engaged to diagnose and fix the problem. That is another matter that I am pursuing apart from getting the refrigerator back on line that has been off for more than 10 days.
I went and saw Good Guys where I bought the unit from . They are of no help at all although it is only seven months outside the warranty period. They told me to contact SA. When I contacted the nearest Sharp Service provider that is listed on their site, they said that they no longer service Sharp Equipment. And Then I rang the next nearest, which is about 85 km from my place, they said they don't go that far. And Sharp Australia, who I have been trying to contact through their wed site, did ring me up once, with a promise to follow up by email, but I have found them to be little help if anything . I think GG sold me a lemon . And a repairer who so far has not identified the actual problem ... but one step at a time . I live in hope.

Called your customer care team and got the phone number for the local authorised repairer. After the repairer changed one part from the fridge on his first visit, the problem is still there. Called the repairer again and the repairer came for the second time. Now am waiting for the repairer to come for the third time with a new part. Sharp needs to improve its quality control, IMO. I will keep posting here until the case is finalised.

To continue this case. The repairer came for the third time with the parts. He replaced the parts. However, the fridge is still running constantly (producing noise all the time). The repairer quickly reported to Sharp. On 22 December 2017, Sharp represtnative rang me and told me that they would offer the store credit and the store would contact me in the following few days. I contacted the store and asked for a replacement fridge. The replacement fridge was delivered on 2 January 2018. The new fridge is working well so far. Thank Sharp for prompt response to the technician's report and offering the replacement. It was the dealer who slowed the replacement process.