Viessmann Vitopend 100-W Installation And Service Instructions Manual page 41

Repairs
(cont.)
% Cylinder temperature sensor (gas
system boiler)
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50
20 40 60
Temperature in °C
70 90 110
80 100 120
1. Temperature limiter:
Check the temperature limiter, if the
burner control unit cannot be reset
after a fault shutdown, although the
boiler water temperature is below
approx. 90 °C.
■ Pull the leads from the sensor.
■ Check the continuity of the temper-
ature limiter with a multimeter.
■ Remove the faulty temperature lim-
iter.
■ Install a new temperature limiter.
4
■
3
2
1
To reset, briefly turn rotary selector
"tr" clockwise as far as it will go
and then back again. The ignition
process will then be repeated.
Troubleshooting
5
6
41