Fridge freezer refrigerator receiver drier , filter.

These are small items but essential for correct operation, they have 2 main functions.  Filtration and to absorb any moisture and contamination in the system from the initial gas filling.

Silica beads inside the unit absorb any moisture as it passes though the receiver drier and filter out any foreign body's in the refrigerant in a built in mesh on each end of the unit.

The capillary on a fridge is only 1mm wide so its a must to have a drier filter fitted to prevent blockages of the capillary.

What can go wrong with these

If the mesh wears and splits this can allow particles to pass and if the silica beads become saturated they will no longer absorb moisture. They can also become blocked and prevent easy passage of refrigerant as well if anything is suspected to be wrong with the drier you will need to replace which entails braising in a new on and recovery and charging on the system.