A loud repetitive knocking sound coming from your fridge-freezer could indicate a couple of potential issues. Here are a few common causes to consider:
Compressor issue: The knocking sound could be caused by a malfunctioning compressor. The compressor is responsible for circulating refrigerant throughout the appliance. If the compressor is failing or is starting to wear out, it may produce unusual noises like knocking or banging.
Faulty fan motor: Another possible cause is a faulty fan motor. The fan inside the freezer compartment or the condenser fan near the compressor helps circulate air and regulate temperature. If the fan motor is damaged or worn out, it can result in knocking or clicking sounds.
Loose or worn-out components: Over time, various components within the fridge-freezer can become loose or worn out, including pipes, valves, or mounting brackets. These loose or damaged parts can cause vibrations and knocking noises when the appliance is running.
Ice buildup: If there is an ice buildup inside the freezer, it could lead to knocking sounds. As the ice expands and contracts, it can cause the walls or components to shift, resulting in knocking noises.
Water hammer effect: In some cases, the knocking sound might not be directly related to the fridge-freezer itself but could be caused by water hammer. Water hammer occurs when water supply lines experience sudden changes in pressure, leading to loud knocking sounds in the pipes connected to the appliance.
To determine the exact cause and resolve the issue, it's advisable to contact a professional appliance repair technician. They have the expertise to diagnose the problem accurately and safely perform any necessary repairs or replacements.