Causes and Solutions for Washer Drain Backup

When your washer's drain hose backs up, it can be frustrating and inconvenient. Typically, this issue is caused by a clog in the drain line, and can be attributed to various factors such as lint, debris, and buildup of fibers, hair, detergent residue, and limescale. Understanding the causes and knowing how to address them can help prevent future backups and extend the life of your washing machine.

Common Causes of Washer Drain Backup

Drain line backups can occur in several stages, and recognizing the specific source of the clog can help in finding a solution.

1. Elbow Pipe Fitting Outside the Washer

Outside the washer, there is often an elbow pipe fitting connecting the drain hose to the washer. Lint, fabric fibers, and other debris are commonly trapped in this bend. To clean it out, you need to disconnect the drain hose and insert a drain snake or use a plastic drain cleaner. A drain snake is usually the recommended tool for tackling clogs located within the washer and in the drain hose.

2. Miscellaneous Debris from Washed Items

Items washed in your washer, like pants with pocket contents, can sometimes end up in the drain line. These items can get trapped in the pump inlet, leading to further blockages. Disconnecting the short hose from the pump inlet to remove these debris is essential for maintaining the proper flow of water.

3. Build-up of Fibers, Hair, Detergent Residue, and Limescale

Over time, a buildup of fibers, hair, detergent residue, and limescale can accumulate between the water pump and the waste pipe, creating a pressure point that exceeds the washing machine's pump specification. This can lead to a backed-up drain.

4. Types of Garments Washed

If you regularly wash items such as furry garments, hairy fabrics, or items with a lot of threads (often referred to as 'wooly stuff'), combined with hair, pet hair, and detergent that doesn’t dissolve properly, your drain is more likely to become clogged.

Drain Pump Filter Maintenance

Most washing machines come equipped with a drain pump filter. This filter can accumulate lint, fluff, coins, hair clips, and undissolved detergent. These filters, often hidden behind a fascia at the bottom of the machine or requiring an engineer to access, should be cleaned regularly throughout the year. Proper maintenance of the drain pump filter can prevent drain backups and save you the hassle of major repairs or replacements.

Regular Cleaning Tips

Remove the filter and clean it thoroughly to remove lint, fluff, and other debris on a regular basis. Ensure the drain hose is properly connected and not kinked or damaged. Check the drain pipe for any visible obstructions and clear them if present. Use a maintenance solution designed for washers to help prevent clogs and buildup.

By being mindful of these common causes and taking proactive measures, you can maintain a smooth and trouble-free washing machine operation. If you frequently encounter drain backup issues, it might be worth consulting a professional plumber to ensure that all drain lines are clear and your washing machine is functioning optimally.