The answer to 'why is my heat pump leaking water' is that a heat pump can leak water for several common reasons, including a clogged condensate drain, a refrigerant leak, or a problem with the defrost cycle. This water leakage is usually a sign of an issue that needs to be addressed to prevent further damage and ensure your heat pump is operating efficiently.
One of the most common causes of a leaking heat pump is a clogged or blocked condensate drain line. As the heat pump operates, it removes moisture from the air, which collects in the drain pan and needs to be properly drained away. If the drain line becomes clogged with dirt, debris, or algae, the water can back up and start leaking out of the unit. This is usually a relatively simple DIY fix, as you can try to clear the drain line or replace it if necessary.