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for the user
Solution: call a [Hermann Technical Centre] [qualified technician].
E12 Domestic Mini tank sensor damaged
Red light: flashing Alarm type: service
Solution: call a [Hermann Technical Centre] [qualified technician].
E18 Boiler Filling in progress
Red light: off Alarm type: none
Cause: Heating system pressure dropped (most likely on account of a water leakage) and
boiler is automatically filled with water.
Solution: Wait until alarm code disappears.
If this operation occurs 3 times within 24 hours boiler will be blocked and ‘service’ will be
displayed because a big leakage is present in the heating system (radiators included).
Anyway, it is recommended to call a [Hermann Technical Centre] [qualified technician] in
case this operation is very usual.
Be careful that if boiler is filled with anti freezing solution, any automatic filling with water
will dilute solution.
E19 Filling not completed within available time
Red light: flashing Alarm type: service
Solution: call a [Hermann Technical Centre] [qualified technician].
E21 Low water pressure in the primary/heating system (3 automatic filling already
executed)
Red light: flashing Alarm type: service
Cause: There is a water leakage inside your heating system
Solution: Switch boiler off by pressing
and disconnect electrical line through main switch.
Switch boiler on pressing again. E18 code may be displayed: it should disappear
within 5 minutes otherwise (if E21 code is on again) call a [Hermann Technical Centre]
[qualified technician]. Do not try to reset boiler once more.
E22 Imprecise data storing
Red light: flashing Alarm type: service
Solution: call a [Hermann Technical Centre] [qualified technician].
E29 modulation gas valve coil damaged (short circuit)
Red light: flashing Alarm type: service
Solution: call a [Hermann Technical Centre] [qualified technician].
E31 Remote control* not working
Red light: flashing Alarm type: service
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