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5790 982 - 02
Vitoligno 300-C Operating Troubleshooting
There is No Hot Water
The DHW is Too Hot
“Fault” is Shown on the Display
“Solar Risk of Overheating” Appears on the Display
Cause Remedy
Control unit incorrectly set. Check and correct the DHW temperature if required
(see page 28).
Sensor fault Notify your heating contractor.
Cause Remedy
Heating system fault Check the type of fault (see page 39) and notify your
heating contractor.
Cause Remedy
No more heat can be transferred from a connected
solar thermal system (e.g. solar tank is full) and the
collectors are overheating.
This message is for information only and disappears
once the solar thermal system has cooled down again.
Cause Remedy
Control unit incorrectly set. Check the settings and correct if required:
DHW heating must be on (see page 28)
DHW temperature (see page 28)
Time (see page 37)
Switching times (see page 29)
DHW tank is cold. Check the DHW heating times (see page 29)
Check the set DHW temperature (see page 28)
If the heating times are OK: Check the temperature of
the DHW tank.
If it is too low: Notify your heating contractor.
The DHW tank pump is not running. Check the heating times. If the pump is supposed to be
running according to the times set in the control unit:
Notify your heating contractor.
Mixing valve faulty Notify your heating contractor.
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