The compressor in the fridge energises for a constant 30 mins in every 90 mins. Is this normal?

It sounds like there may be an issue with the fan or the control board in your Viking refrigerator. The constant running of the fan, even when the compressor is not running, is not normal. The fact that different repair technicians have given different diagnosis and the issue persist even after replacing the compressor fan motor, suggest that it may be a problem with the control board, which manages the refrigeration system, including the fan. It could also be a problem with the thermostat, or the system's settings. Since the fridge and freezer seem to be at normal temperatures, it may not be a problem with the cooling system. It's best to contact Viking customer service for further assistance and see if they can provide any additional information or troubleshooting steps. If the issue persist, it's best to ask for a senior technician or supervisor to take a look at it and provide a resolution.

Based on the information you provided, it sounds like your Kenmore refrigerator is operating normally.
Most modern refrigerators are designed to cycle on and off in order to maintain the temperature inside the fridge and freezer compartments. During the "on" cycle, the compressor runs and cools the refrigerant, which in turn cools the air inside the fridge and freezer. During the "off" cycle, the compressor stops running and the refrigerant flows back to the compressor to prepare for the next cycle.
The length of the on and off cycles can vary depending on factors such as the ambient temperature in the room, the amount of food inside the fridge, and how often the doors are opened. However, it's normal for a refrigerator to cycle on for around 10-15 minutes and then off for around 20-30 minutes.
If the temperature inside the fridge and freezer compartments is staying at the correct levels, then there is likely no cause for concern. However, if you notice any unusual sounds, odors, or fluctuations in temperature, it may be worth having a professional technician inspect the refrigerator to ensure it's functioning properly.

The fan should run when the compressor runs.

The compressor is high siding....i.e there was a BRIEF power outtage and it was repowered before the coolant system stabilized to the compressor does not stand a chance of starting due to high pressures so about every 4 minutes or so you should hear a click or note a brief blink for about 40 seconds of lights in the home. This is the termal overload cycling. The compressor / coolant system needs to equalize. Unplug it for 30 minutes then plug it back in and listen for the compressor to start. After a 10 minutes... feel the front of the chassis where the doors close. It should be warm to the touch. If you feel the chassis is warm... after 10 minutes everything should be back to normal. IF not respond with a complete model number. My bet is it will start after a 30 min rest.

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Kelly

compressor is faulty. It controls both the fridge and freezer. you have a minute chance that if you switch the fridge off for 30 min. and retry it would have cooled down enough to restart.

if you cant hear the motor/compressor running when energised then its likely to be a thermostat fault... but on energising the system if you hear a buzz then a click then its more seriously the main motor... turn off at mains for 5 mins then turn on... this should tell you either way

if you cant hear the motor/compressor running when energised then its likely to be a thermostat fault... but on energising the system if you hear a buzz then a click then its more seriously the main motor... turn off at mains for 5 mins then turn on... this should tell you either way

if the fan blade is contacting anthing under there and stops it will shut down the compressor and wont work

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Freezer temp + fridge temp for 3-8 sec to lock function

cycling every 30 mins is normal. bear in mind that frost free are more noisy as there are fans running as well.
you appear to have temp in freezer too high - should be -18degC