What Is the Most Common Cause of a Blocked Drain on a Split System Air Conditioner?
If you’ve ever noticed water leaking from your split system air conditioner or a damp patch on the wall beneath it, chances are you’re dealing with a blocked drain line. It’s one of the most common issues that affect split systems and thankfully, it’s also one of the easiest to prevent.
Understanding the Drain Line
Every split system air conditioner has a condensate drain line, which carries away the moisture that forms when warm air passes over the unit’s cold evaporator coils. Normally, this condensation flows through the drainpipe and exits outside.
But when the drain line becomes blocked, the water has nowhere to go, and that’s when you start seeing leaks, mould growth, or even error codes on your unit.
The Most Common Cause: Algae and Mould Build-Up
The number one culprit behind a blocked drain line is algae and mould growth inside the pipe.
Because the drain line is dark, damp, and rarely cleaned, it becomes the perfect environment for organic build-up. Over time, these slimy deposits restrict water flow, eventually causing a full blockage.
Other Possible Causes
While algae is the most frequent offender, there are a few other reasons your drain line might get blocked:
- Dust and debris from the indoor unit combining with moisture to form sludge
- Kinks or dips in the drain hose that trap water
- Poor installation, such as incorrect pipe angles or missing insulation
- Insects or small pests nesting in the outdoor drain outlet
Signs Your Drain May Be Blocked
Watch out for these common warning signs:
- Water dripping from the indoor unit
- A musty smell near the air conditioner
- Reduced cooling performance
- Error codes or the system shutting off unexpectedly
How to Prevent Drain Blockages
Regular maintenance is the best defence against blocked drain lines. Here are a few simple tips:
- Schedule annual servicing: A qualified technician like Emirg Services can flush and clean the drain line during routine maintenance.
- Keep filters clean: A clean air filter prevents dust from mixing with condensation and forming sludge.
- Check for leaks: If you notice water where it shouldn’t be, act quickly before the problem worsens.
When to Call Emirg Services
If your split system is leaking or showing signs of drainage issues, it’s best to call a professional air conditioning technician. They can safely clear the blockage, inspect the system for damage, and ensure it’s draining correctly again.
In Summary
The most common cause of a blocked drain on a split system air conditioner is algae or mould build-up inside the condensate drain line. Regular cleaning can prevent this from occurring, keeping your system running efficiently all year around.
Contact Emirg today to book a service for your air conditioner 07 2809 0250
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