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Air Conditioning 12 April 2026 5 min
Air Conditioning Leaking Water Inside? Causes & Fixes (Luxembourg)
Why Your AC Is Leaking Water Indoors
Water dripping from your indoor AC unit isn't just annoying — it can damage walls, floors, and ceilings. Here's what's actually happening.
Top 4 Causes
- Clogged condensate drain — the most common cause. Algae and dust block the drain line.
- Frozen evaporator coil — caused by a dirty filter or low refrigerant. Ice melts and overflows the tray.
- Dirty air filter — restricts airflow, causes coil freezing
- Cracked drain pan — older units (10+ years) develop cracks
What You Can Try First
- Turn off the AC for 2–3 hours to let any ice melt
- Replace or clean the filter — should be done every 1–3 months
- Check the outdoor drain line for blockage
If the leak comes back, you need a professional.
What an AC Technician Will Do
- Flush the condensate drain with pressure
- Check refrigerant levels
- Clean the evaporator coil
- Inspect the drain pan for cracks
Typical Repair Cost
| Service | Cost | |---------|------| | Drain unblocking + clean | €120–€220 | | Coil cleaning | €150–€280 | | Refrigerant top-up | €180–€350 | | Drain pan replacement | €250–€500 |
Call our AC team in Luxembourg at +352 27 58 58 25 — same-day service across the country.