Danfoss RET B User & Installation Instructions Manual page 13

Thermostat status (cool mode only)
GB
A snowfl ake symbol will be lit whenever the thermostat is
calling for cooling. If this is seen to fl ash, the thermostat output
is delayed for a short period to prevent compressor damage.
Low battery indication
A battery symbol will fl ash in the display when batteries require
replacement. Batteries should be replaced within 15 days, after
which the thermostat will turn off the load it is controlling.
When this happens "Of" will be displayed.
IMPORTANT: alkaline batteries must be used.
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