Heat pump problems and causes
Common heat pump problems — high consumption, short cycling, lukewarm water — with likely causes and checks.
- The heat pump uses too much electricityWhy is the heat pump's electricity bill high? Common causes: high heating curve, backup heat, hot water settings and building heat loss.
- The heat pump starts too often (short cycling)Why does the heat pump start every twenty minutes or so? Causes of short cycling, impact on wear, and checks to run.
- Hot water is lukewarm or runs out quicklyWhy is hot water lukewarm or does it run out quickly? Tank volume, temperature setting, mixing valve and heat exchanger checks.
- Some radiators or underfloor loops don't heat upCold radiators or underfloor loops: balancing, air in the system and flow rate. How to check the problem step by step.
- The electric backup heater runs too oftenWhy does the heat pump's electric backup heater switch on in mild weather? Enable threshold, hot water priority and curve effect.
- The outdoor unit defrosts too oftenFrequent defrost cycles in damp weather: normal behaviour, warning signs, airflow and condensate drainage.
- Room temperature fluctuates during the dayFluctuating room temperature in a heat-pump home: two control logics, night setback and sensor placement.