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Vitoligno 300-C Operating
5790 982 - 02
42
Troubleshooting
Cause Remedy
Central heating is off.
Control unit incorrectly set. Check the settings and correct if required:
The heating circuit must be switched on (see page 23)
Room temperature (see page 18)
Time (see page 37)
Switching times (see page 19)
Control unit fault:
“Fault” is displayed and the red fault indicator flashes
Check the type of fault (see page 39) and notify your
heating contractor.
The heating circuit pump is not working. Contact your heating contractor.
Heating circuit with mixing valve: Mixing valve motor
faulty
Unlock motor lever A and manually adjust mixing valve lever
B (e.g. to “5”). Contact your local heating contractor.
Rooms are Too Cold
Cause Remedy
Control unit incorrectly set. Check the settings and correct if required:
The heating circuit must be on (see page 23).
Room temperature (see page 18)
Time (see page 37)
Switching times (see page 19)
Control unit fault or outdoor temperature sensor/
boiler water temperature sensor faulty:
“Fault” will be displayed; the red fault indicator flashes.
Check the type of fault (see page 39) and notify your local
heating contractor.
Heating circuit with mixing valve: Mixing valve motor
faulty
Unhook motorized lever A and manually adjust mixing valve
lever B (to “5” for example).
Notify your heating contractor.
Rooms are Too Hot
42


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