When your boiler provides heating but no hot water, the issue usually lies with the diverter valve or hot water system rather than the heating circuit. A faulty diverter valve may be stuck sending heat only to radiators. Other causes include low water pressure, a broken thermostat, airlocks, or a malfunctioning flow sensor. Regular servicing and inspection by a qualified engineer can identify the fault and restore hot water safely.

When your boiler provides heating but no hot water, the issue usually lies with the diverter valve or hot water system rather than the heating circuit. A faulty diverter valve may be stuck sending heat only to radiators. Other causes include low water pressure, a broken thermostat, airlocks, or a malfunctioning flow sensor. Regular servicing and inspection by a qualified engineer can identify the fault and restore hot water safely.