Hi everyone, I'm on here in the hope someone can give me some advice.

I'm starting a new takeaway business in my town but having trouble with my walk in chiller. Previous occupants were using okay apparently.

It's a Thermomax Coltrec RCX 100.
Can't get it to cool down. Sits at 15℃, when the temp starts to drop then the fan cuts off.. temp then rises again.
I'm not familiar with the operation of this unit..

Any help would be greatly appreciated.

Thanks