During normal operation, air source heat pumps collect condensation from the air, especially in hot and humid weather.  The condensation drips from the unit and drains away through a pipe into a suitable soak away.

At the other extreme, in very cold weather the water on the condenser can freeze, heat pumps deal with this ice build-up by running a defrost cycle to melt it, causing water to enter the condense drain.

If the pipework or condense drain on the unit has come loose or is not connected properly this could cause water to drip underneath the unit instead of going into the soakaway.

Alternatively, if the condense pipe becomes blocked with dirt, leaves, or other debris, the condense tray can overflow and cause the water to spill onto the floor around the heat pump.