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how to fix 2 rads that overheat?

2 rads on system, - 1 upstairs- 1 downstairs, that are fitted with thermostat valves- don't respond to therm adjustings. come on and stay on full heat! How do fix? Thanks for help
Jean, May 2007
fit two new trv's if they are old they may be knackered.

hi-spec plumbing, May 2007