Recently I have heard an intermittent hissing/whirling noise coming from both the downstairs boiler and the upstairs pump/hot water system. The pump is very hot to the touch. It happens for a couple of minutes when the boiler fires up, stops, then happens again. Please could you help. It is very worrying.
It is an Apollo Boiler and a Grunsfog Selectric Pump.
It is an Apollo Boiler and a Grunsfog Selectric Pump.