5.6 Exchanging control battery at F 157
At error message 157 the control battery must be
replaced.
The notices on the display are to be followed:
All data is stored in the service memory.
Disconnect machine from mains
Exchange battery
As soon as the machine is reconnected to the mains all
data is automatically loaded into the service memory.
5.7 Check pressure reducer
See chapter 8.2 Setting pressure reducer
5.8 Depressurization
Temperature and pressure are reduced under control, also
in cases of overpressure, e.g. following a malfunction of
the heating switch and overheating of the boilers.
Before opening the screw connections in the boiler water
system this routine must be run for safety reasons.
5.9 Descaling
Descaling can only be made by the service technician.
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