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11. Pre-heat function
When changing from Economy to Comfort temperature in AUTO mode, your thermostat will anticipate the rise in
temperature so that it reaches the right temperature at the scheduled time.
Example (see opposite): 6:30 am, Economy period, currently pre-heating to reach the temperature of 20°C at 8:00
am.
The pre-heating function's speed and accuracy is based on the heater type used and its heating inertia..
11.1 Changing batteries
• The symbol
appears.
You have approximately 1 month to replace the batteries (either two
LR03 or AAA 1.5 V alkaline batteries).
WARNING: make sure you insert the batteries facing the right way and
that they are the right type (no lithium batteries).
You have 30 seconds to change the batteries before the time setting is
lost (in this case, you will need to reset the date and time).
The configuration and programming are stored in case the power is off
for a long time.
• The display shows dEF21.
You have passed the 1 month limit for low batteries. You
MUST change the batteries in your device.
11.2 Frequently Asked Questions (FAQ)
• The thermostat is on despite the programme not calling for it.
You must have turned on the pre-heat function. If so, then it is normal for your thermostat to anticipate the
temperature rise and it has started pre-heating to get to the Comfort temperature at the desired time
(see § Pre-heat function).
• The thermostat turns off though the requested temperature has not yet been reached.
Your thermostat uses a kind of control that anticipates the inertia in temperature variations in order to calculate
energy needs as accurately as possible and provide maximum comfort.
On the other hand, anticipating a drop in temperature, the heating may turn on once the desired temperature has
been reached.
Pre-heat in progress is shown by the flashing
Comfort signal.
symbol and the
1
2
3
4
1.5V alkaline
batteries
LR03 (AAA)
15
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