83
Viessmann NTC 20 kΩ (orange marking)
80
120
160
200
Temperature in °C
40
0.1
1
10
Resistance in k
Ω
0
40
20
20
60
100
140
180
Viessmann Pt500A (green marking)
460
20
540
100
Resistance in
Temperature in °C
60
140 180
620
700
780
860
-20
Checking MCB/fuses
Fan
MCB/fuse location: See page 24.
The 6.3 A (slow, H) MCB/fuse is located
at the mains terminals of the fan.
Heat pump control unit
Position of the fuses: See from
page 33.
■ Fuse F1 is located on the mains ter-
minal of the heat pump control unit.
■ Fuse F3 is located on the main PCB.
Troubleshooting
Repairs
(cont.)
5516 436 GB
Service
