DeDietrich MCR 24, MCR 24/28MI, MCR 30/35MI, MCR 34/39MI Manual page 18

Before any work is carried out on the equipment / heating system, the
power supply must be disconnected (by means of the appropriate
fuse or main switch, for example) and warning must be given before
any reconnection.
In the event of prolonged absences (weekend, holidays): Switch the
boiler off.
Boiler with antifreeze protection
- Set the room thermostat or the regulator: for example 10 °C.
- Define parameter P4 as 1 (energy-saving mode); the heat
retention function will be deactivated.
The boiler will then only start up to protect itself from frost.
18
MCR boiler off
LTALW7H000217a
MCR 24, 24/28MI, 30/35MI, 34/39MI
Boiler without antifreeze protection
If the central heating system is not used for a long period, we
recommend switching the boiler off.
- Close the gas valve.
08/06/06 - 300008487-001-A