I have a wall mounted thermostat. When I switch it to 0 it should not come on. However even when the temp is 10C the radiators still switch on. What is wrong?

Greg, March 2009

Greg

Possibly the stat is not graduated in degrees on a zero to 30 basis ie zero on the stat is not zero in the space. Most room stats are V.simple bimetallic strips and not a precision instrument. they rare a bit accurate at between 16 and 25 degrees
At the end of the day it may just be knackered

kennyf, March 2009