Either gas went out (then you must find the leak, usually the couplings), or you have debris blocking the capillary pipe. Try switching it off for 20 minutes, then back on again. If doing this 3 times still doesn't clear it, you probably need regassing, or it's totally blocked. Listen to the sound on the evaporator place - you should hear bubbles, like boiling water (only it's boiling refrigerant).
If switching it off for a while does clear it, it's debris. Installing a filter dryer will fix this (it's a piece of gauze that traps the debris but lets the refrigerant through). Prefilled filter drier kits with quick couplings are available (for >€100, but cheaper than a hired out regassing) from the usual boat fridge kit assemblers. Gotta get one that matches the quick couplings you have.
In our fridge the debris was from the sealant in the quick connect couplings breaking down. They also leaked refrigerant out as the o-rings had gone brittle. I did get the kit to evacuate and regas it myself after taking the couplings apart and cleaning them up. Also replaced the o-rings.
