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(TRVs) on individual radiators. If you don’t have TRVs, you
should choose a temperature that is reasonable for the whole
house. If you do have TRVs, you can choose a slightly higher
setting to make sure that even the coldest room is comfortable,
then prevent any overheating in other rooms by adjusting the
TRVs. The time on the programmer must be correct. Some
types have to be adjusted in spring and autumn at the changes
between Greenwich Mean Time and British Summer Time.
You may be able to temporarily adjust the heating programme,
for example, “Override”, “Advance” or “Boost”. These are
explained in the manufacturers instructions.
Programmable room thermostats need a free flow of air to
sense the temperature, so they must not be covered by
curtains or blocked furniture. Nearby electric fires, televisions,
wall or table lamps may prevent the thermostat from working
properly.