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altis · 02-02-2010, 08:43

To prove a point you could temporarily switch off the boiler and let the pump come on again. If the tapping continues with no heat then it's not an expansion problem and must be something loose inside.

If you move your hand about on it you may be able to feel the location. My guess it's coming from the TRV.

02-02-2010, 08:43	#15
altis Inactive Join Date: Jun 2003 Location: Warrington ntl:81304 Altitude: 12m (and falling) Posts: 4,499	Re: 'Tapping' Radiator To prove a point you could temporarily switch off the boiler and let the pump come on again. If the tapping continues with no heat then it's not an expansion problem and must be something loose inside. If you move your hand about on it you may be able to feel the location. My guess it's coming from the TRV.