LIEBHERR CTP 3316 fridge-freezer cooling problem

Hi,

I have a LIEBHERR CTP 3316 fridge-freezer, bought in 2013, that intermittently goes warm (fridge: 8 to 15, freezer: -1 to -30). The compressor does not work all the time, the drain hole is not blocked and there is no ice build up inside the fridge compartment. Switched-off for 48-hours for full defrosting did not change things, although it worked well for the first few hours (fridge: 5, freezer -18).

Through reading on-line, I am wondering if this behavior is due to defective temperature sensor. Could you point me in the direction of a service manual?

I would very much appreciate your feedback.

Service number: 9989872-00
Model: CTP 3316
Index: 20 / 001