Operating instructions

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whole house. If you do have TRVs, you can choose a slightly
higher setting to make sure that even the coldest room is
comfortable. In the other rooms adjust the TRVs to prevent
any overheating.
The time on the programmer must be correct. The clock will
have to be adjusted in spring and autumn at the changes
between Greenwich Mean Time and British Summer Time.
Programmable room thermostats need a free flow of air
to sense the temperature, so they must not be covered
by curtains or blocked by furniture. Programmable Room
Thermostats must be sited to avoid localised heat from
sunshine, electric fires, televisions, and wall or table lamps
that may prevent the thermostat from working properly.