Viessmann VITOCAL 300-G Installation And Service Instructions For Contractors page 70

Maintenance
Checking the fuses
2. Opening the wiring chamber.
3. Check fuses. Replace if necessary.
Danger
Incorrect or improperly fitted fuses can lead
to an increased risk of fire.
Insert fuses without using any force. Posi-
■
tion fuses correctly.
■ Only use structurally identical types with
the same response characteristics.
Appliance is too noisy
Possible causes:
Casing door is not closed tightly: See page 13.
■
■ Hydraulic lines and electrical cables are touching or
coming into contact with other components of the
heat pump, e.g. the casing.
70
(cont.)
Danger
Removing the fuse does not switch the power
circuit to zero volt. Contact with 'live' compo-
nents can lead to serious injury from electric cur-
rent.
Before working on the equipment, always
ensure that the power circuit is also at zero
volt.