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The purpose of this device is to control the temperature 
of the HEATING when the timer allows it to be switched 
on. 
The hot water will not be affected in any way. 
 
 
 
 
 

Normal operation of the thermostat 

 

Normal Display 

The display will normally show the room temperature 
measured by the thermostat. 
If the flame symbol is visible*, this means that the boiler 
should be on. 
 
 
 
 
 

To enquire about the set temperature 

Simply press one of the arrow buttons and the display 
will show the set temperature. After a few seconds it 
will go back to showing the room temperature. 
 
 
 
 
 

To change the set temperature 

Keep pressing the arrow buttons and the display will 
change to show the new set temperature. 
Press the 

S

 button to increase the temperature, and 

the 

 button to decrease the temperature. 

 
 
 

 
 
To switch on or off 

Press and hold the button marked 
for 2 seconds to switch off. 
In the bottom right corner display will show this symbol. 
 
 
 
 
To switch the thermostat back on, press and hold the 
same button again for 2 seconds. The symbol in the 
bottom right hand corner will disappear. 
 
 
 
 
 
 
 
 

50029850-002 

GUIDE TO THE USE OF THE DT90E ROOM THERMOSTAT 

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