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      12-14-2012, 09:13 AM   #7
briers's Avatar
Drives: XFR
Join Date: May 2010
Location: Midlands,UK

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Three things came to mind, balancing, faulty TRV, try pump speed on highest setting if not already so. With a note that pump speed 3 can sometimes introduce air which needs bleeding from furthest rad every few weeks. Bleed with system cold.

I'm not a heating engineer so only guessing, but as you said you turned off all other rads, i'm not so sure my thoughts count now.
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