Danfoss Heating
5
GB
What is a Programmer?
... an explanation for householders.
Programmers allow you to set ‘On’ and ‘Off ’ time periods. Some 
models switch the central heating and domestic hot water on 
and off  at the same time, while others allow the domestic hot 
water and heating to come on and go off  at diff erent times.
Set the ‘On’ and ‘Off ’ time periods to suit your own lifestyle. On 
some programmers you must also set whether you want the 
heating and hot water to run continuously, run under the chosen 
‘On’ and ‘Off ’ heating periods, or be permanently off .
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 manufacturer’s instructions.
The heating will not work if the room thermostat has switched 
the heating off . And, if you have a hot-water cylinder, the water 
heating will not work if the cylinder thermostat detects that the 
hot water has reached the correct temperature.
The text below has been edited and approved by the 
Plain English Campaign, who has issued a Crystal Mark 
to be displayed with it.