Viessmann VITOCAL 200-G Installation And Service Instructions Manual page 81

Repairs
(cont.)
Temperature sensors type Pt500
860
780
700
620
540
460
-20 20 60
Temperature in °C
Checking the MCB/fuses
MCB/fuse arrangement (see page 39):
■ MCB/fuse F1 is located on the luster
terminal for the heat pump control unit
power supply.
■ MCB/fuse F3 is located on the main
PCB.
MCB/Fuses F1 and F3:
■ 6.3 A (slow), 250 V~
■ Max. power loss ≤ 2.5 W
Appliance too noisy
Possible causes:
■ Transport bracket not removed: See
page 32.
■ Hose outlets in diaphragm grommets
not watertight: See page 62.
■ Casing door not tightly sealed: See
page 77.
100 140 180
Capturing element "Pt500"
■ System flow temperature sensor (F13)
■ Buffer temperature sensor (F4)
■ Cylinder temperature sensor (F6)
■ Flow/return temperature sensor, sec-
ondary circuit (F8/F9)
■ All sensors inside the heat pump
■ Boiler water temperature sensor,
external heat generator
Danger
Contact with 'live' components
can lead to serious injury from
electric current.
Before working on the equip-
ment, always ensure that the
power circuit is also at zero
volt.
Removing fuses does not switch
the power circuit to zero volt.
Troubleshooting
81