Danfoss RET1000 B Mode D'emploi page 7

Low Battery Indications (RET1000B)
For battery powered thermostat (RET1000B) when the batteries
require replacement the power LED will fl ash once per minute.
Batteries should be replaced within 15 days, after which the
thermostat will turn off the load it is controlling. If the power
LED does not illuminate when the dial is turned the batteries
may have expired and should be replaced immediately to avoid
damage to the thermostat.
Danfoss Heating
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