Heating problems
Heating problems: causes and what to do
Pick what you see – we show the likely causes, what you can safely check and how to get a technician fast.
Radiators not heating or warm only at the topCold radiators are the most common heating-season complaint. Usually it is air in the system, unbalanced flows or sludge. Below: what you…Causes and what to do →
Underfloor heating heats unevenlyWhen some rooms are warm and others cool, the loop flows are usually not matched or the loops are fouled. It is…Causes and what to do →
Boiler pressure keeps droppingIf you top up the pressure every few days, there is a cause: a leak, the expansion vessel or the safety valve.…Causes and what to do →
Heating system is noisy or bubblingBubbling, knocking or whistling points to air, scale in the heat exchanger or wrong pump settings. Fixing it in time protects the…Causes and what to do →
Heating bills went upIf bills rose more than energy prices, the usual causes are a fouled heat exchanger, wrong settings or an unbalanced system. Maintenance…Causes and what to do →
Hot water is unstableWhen hot water swings between hot and lukewarm, the usual causes are the flow sensor, a scaled heat exchanger or cylinder control.…Causes and what to do →
Boiler or heat pump shows an error codeAn error code means the unit protected itself. Codes are defined by the manufacturer, so we do not guess – note the…Causes and what to do →
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