50
23 - BATTERY REPLACEMENT
When the indicator flashes on the display, it means
that there is around 1 month left to replace the bat-
teries (fig. 83). When the
indication plus the
symbol appear on the display, the unit is no longer
operative and has set the heating and air-condition-
ing system to OFF (fig. 84).
ATTENTION. Failure to replace the batteries in time
may cause damage to the heating system (frost pro-
tection is not ensured).
TH450
To replace the batteries, proceed as follows:
23.1-
Press button
A
on the base (fig. 85) and open
the unit.
Performing this operation when the battery low warn-
ing is flashing will cause all symbols on the display to
disappear but not be lost.
23.2-
Insert three new
alkaline
LR03 size AAA 1.5V
batteries of the same type. Pay attention to polarity as
shown on the bottom of the housing (fig. 86).
TH450
Fig. 83
Fig. 84
