Rooms Are Too Cold; Rooms Are Too Hot - Viessmann VITOLIGNO 300-C Operating Instructions Manual

Troubleshooting

Rooms are Too Cold

Cause
Central heating is off.
Control unit incorrectly set.
Control unit fault:
"Fault" is displayed and the red fault indicator flashes
The heating circuit pump is not working.
Heating circuit with mixing valve: Mixing valve motor
faulty

Rooms are Too Hot

Cause
Control unit incorrectly set.
Control unit fault or outdoor temperature sensor/
boiler water temperature sensor faulty:
"Fault" will be displayed; the red fault indicator flashes.
Heating circuit with mixing valve: Mixing valve motor
faulty
42
Remedy
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)

Check the type of fault (see page 39) and notify your
heating contractor.
Contact your heating contractor.
Unlock motor lever A and manually adjust mixing valve lever
B (e.g. to "5"). Contact your local heating contractor.
Remedy
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)

Check the type of fault (see page 39) and notify your local
heating contractor.
Unhook motorized lever A and manually adjust mixing valve
lever B (to "5" for example).
Notify your heating contractor.
Vitoligno 300-C Operating