Understanding Fridge Freezer Refrigerant Gases

Please remember: Refrigerant gases can be hazardous and flammable. Working on sealed refrigeration systems requires specialized equipment and knowledge. Ensure you comply with local environmental regulations regarding gas disposal.

In a modern home, a fridge is a "sealed system," meaning the gas inside should technically last forever. If your unit has stopped cooling, it’s rarely just "old age"—99% of the time, there is a leak or a blockage.

Common Gases Explained:

• R12: Now banned and obsolete. If your unit uses this, it cannot be legally repaired due to environmental risks.

• R134a: The common replacement for R12. While banned in new production, it is still the standard for many aftermarket repairs.

• R600a (Isobutane): The current industry standard. It’s highly efficient but also flammable. Extreme care must be taken during repairs to avoid ignition sources.

Why systems fail: Leaks usually occur from physical damage (moving the unit) or corrosion in older copper pipes. Blockages are often caused by moisture entering through a leak or oil moving into the cooling lines if the unit was transported upside down.

All refrigeration units use a small amount of gas charge in the refrigeration process. The gas is held within a sealed system and should never run out or go low unless there is an issue somewhere or a leak of gas for example a pin hole in the pipe work.

When the gas becomes to low the fridge unit will stop working and 99% of the time this is caused by some damage it the system when moving it or dropping things behind the fridge freezer unit it could be caused by very old units becoming porous but this is rare to find units so old in todays society.

These systems use very small diameter copper tubing and as such they can block up, blockages are usually caused by moisture or oil. Water or moisture usually enters the system when it is shut down with a hole in the system this allows moist air in which must be vacuumed out after repairing the system oil is usually a problem if the unit it turned upside down or transported incorrectly or after a problem with the compressor again vacuuming down and recommissioning system would cure this.

Gases used in fridge freezer units 

R12 this is now banned and should not be repaired the gas is too dangerous for the environment and its hard to even buy thee gas now.

R134a was a less dangerous for the environment replacement for R12 this has now been banned in the production of new units but is still used in the aftermarket, used and repair markets for fridge freezers.

R600a probably most widely used today this gas is flammable so care has to be taken in this regard but its rare to use more than 50-60grams in domestic units so not too much of an issue.