If unit has stopped cooling there are 4 x things that could cause it;
1. Inner fan faulty, part number BCH48-SS-FAN-INNER, price $59, fill in below to arrange.

2. If unit runs but still no chill, the cooling module chip has failed, this is small ceramic chip that can fail over time, especially if unit is installed incorrectly. Part number BCH48-SS-COOLING-MODULE, price $69, fill in below to arrange.

3. Unit doesn't seem to come on at all, this means PCB board has failed,. Part number BCH48-SS-PCB, price is $79, fill in below to arrange.

4. On the inside of fridge there is a small push 'button' that activates when door closes, this actually turns OFF light and allows unit to turn ON. Sometimes over time the door foaming may change in structure and it can shrink a few mm, this then causes the inner door area that activates switch not be able to touch the switch, hence unit wont come on. You can check this by opening door and using your finger to push it in, then you can see if it is activating as pushing it in means unit will come ON. The inner door may NOT be touching this button. Slab part number BCH48-SS-Slab, price is $29, fill in below to arrange.

Parts Summary
Inner Fan, part number BCH48-SS-FAN-INNER, price $59, fill in below to arrange.
Cooling Module, part number BCH48-SS-COOLING-MODULE, price $69, fill in below to arrange.
PCB, part number BCH48-SS-PCB, price is $79, fill in below to arrange.
Slab part number BCH48-SS-Slab, price is $29, fill in below to arrange.