A heat pump needs air to heat water. So, if the evaporator coil becomes clogged with debris, the air flow will be low, and this will result in a heat pump that not only consumes more electricity but also takes longer to heat your water or doesn’t heat at all.
Check the evaporator coil and remove any leaves, dirt, sticks, twigs, or any other debris that may have gotten caught in there.
Heat pump manufactures usually provide a cleaning/maintenance schedule with the unit as a guide, however environmental factors may require that more frequent cleaning be done, never use any harsh or corrosive detergents to clean the unit or the evaporator coil, even if a mild soap is used (sprayed on) ensure that it is thoroughly rinsed with a medium flow hose pipe. (take care not to damage any fins during the cleaning process)
