Vemer CHRONOS Series User Manual page 67

The instrument performs a regulation of emergency if an error occurs during the
reading of the probe or in case of time loss.
In case of
field .
In case of time loss (because of depleted batteries or blackout of a duration higher
than the charge reserve) the instrument restarts from the off mode, adjusting on the
basis of the antifreeze temperature, if it hasn't been deactivated before. Reset date/
time to go back to the normal operation (programs modifications and settings remain
memorized).
period (times or days) and once passed the programmable thermostat changes the
Timed automatic
Timed manual
, if the antifreeze function is not deactivated, the instrument
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CHRONOS Programmable Thermostat User Manual
Err on