Heat Pump Leaking Water in Greater Vancouver

Water around a heat pump unit is one of the more alarming sights for Greater Vancouver homeowners — but some condensate is normal, while other water sources indicate a problem worth addressing.

What This Means

Both indoor and outdoor heat pump units produce condensate during certain operating modes. Normal condensate is managed by drain pans and drain lines. Water appearing inside the home, in large quantities, or in the wrong location indicates a drain, coil, or installation issue.

Common Causes

• Indoor unit: condensate drain line clogged — water backs up and overflows the drain pan
• Indoor unit: drain pan cracked or not level — water bypasses the drain pan
• Indoor unit: coil freezing and thawing — ice on indoor coil melts and overflows drain capacity
• Outdoor unit: condensate during cooling mode or defrost water — normal drainage to the ground
• Outdoor unit: drain holes blocked in base pan — water accumulates inside the unit

What Homeowners Can Check Safely

• Check whether water is coming from the indoor air handler or from pipes nearby
• Look for water staining or moisture on the ceiling or wall below/behind the indoor unit
• A wet floor beneath the outdoor unit after a warm day or during defrost is typically normal

When to Call a Licensed Technician

Heat pumps contain refrigerant under pressure, electrical components at line voltage, and control systems that require specialized diagnostic tools. Do not open refrigerant circuits, bypass safety switches, or attempt to recharge refrigerant without proper certification.

• Condensate drain line flush and cleaning
• Drain pan inspection and replacement if cracked
• Indoor coil inspection for icing — diagnose cause (low refrigerant, filter, airflow)
• Drain pan levelling if unit has shifted
• Condensate pump inspection if building drainage requires pumping

Frequently Asked Questions

Why is water dripping from my mini-split wall unit?

Water dripping from a wall-mounted mini-split (ductless indoor unit) is almost always a blocked condensate drain line. The small drain tray fills up and overflows. The drain line runs through the wall to the outside — if it is kinked, clogged, or has grown algae, it stops draining and water backs up inside the unit. Flushing the drain line resolves this in most cases.

Is it normal for the outdoor heat pump unit to drip water?

Yes, in two situations: during cooling mode, moisture in the air condenses on the cold outdoor coil and drips from the base pan — this is normal. During defrost cycles in heating mode, melted frost runs off the coil and drains from the base pan — also normal. A pool of water that persists for hours after the unit shuts off, or water running in unexpected directions, is worth investigating.

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