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When the batteries are nearing the end of their life a low
battery symbol will appear in the display and the
batteries should be changed within a few days. If the
batteries are not changed at this point eventually a 'LO'
battery message flashes intermittently in the display
and if this happens the batteries should be changed
immediately.
To change the batteries it is necessary to remove the
thermostat from the wall. To do this first undo the two
captive screws at the base of the thermostat and swing
the thermostat up and away from the wall plate.
Battery Replacement
The HRT4-B runs on 2 x type AAA (Alkaline)
non rechargeable batteries and is designed
to give a battery life of approximately two
years.
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