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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 them (two 1.5 V alkaline
batteries, either LR03 or AAA).
WARNING: make sure you insert the batteries facing the right way and
that they are the right type (no lithium batteries).
You have about 30 seconds to change the batteries before the time
setting is reset (in this case, reset the day and time setting).
The configuration and programming are saved 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 means you can anticipate the inertia in temperature variations in order
to calculate energy needs as accurately as possible and provide maximum comfort.
Conversely, to allow for a drop in temperature, the heater may turn on once the desired temperature has been
reached.
Pre-heat in progress is shown by the symbol
Comfort signal.
flashing and the
1
2
3
4
1.5V alkaline
batteries
LR03 (AAA)
15
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