Refrigerant charge loss
The most frequent cause of gradually worsening performance. A slow leak reduces capacity long before the unit stops entirely. Regassing without repairing the leak simply resets the clock.
Airflow restriction
A coil fouled with dust, pollen or coastal salt cannot absorb heat. Performance falls, pressures drift and the unit may lock out. This is preventable with routine cleaning.
Water side problems
If the circulation pump fails or a valve is closed, the heat pump heats a small trapped volume of water and the tank stays cold. Always worth checking after other plumbing work has been done.
Sensors and set-points
A drifted sensor makes the controller believe the tank is hotter than it is. Cheap to fix, easy to miss.
If you want this assessed on your own property, call 069 268 0988. We inspect, explain what we find, and quote in writing.