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How can I fix a 'Westherm Four' thermostatic rad. valve?

Regardless of the temperature setting of the valve, the radiator is always ON. Rotating the cap makes no difference.
P&G22, July 2010
Under the control head is a brass pin - they often get stuck in the fully on position - remove the control head and pull the litle pin up gently with pliers.

http://davidkearns.co.uk/plumbingtips_files/trv.gif

Peccavi, July 2010
link Click here to see other fixes for Westherm Four.