Viessmann VITOPEND 100-W Installation And Service Instructions Manual page 37

Repairs
(cont.)
3. Outlet temperature sensor (gas
fired combi boiler):
Pull the leads from the sensor.
Check the sensor resistance and
compare it with the curve.
Replace the sensor in case of
severe deviation.
Danger
The outlet temperature sen-
sor is immersed in the DHW
(risk of scalding).
Drain the DHW side of the
boiler before replacing the
sensor.
Checking the fuse
Note
Switch OFF the power.
4. Cylinder temperature sensor
(gas fired central heating boiler):
Pull plug % from the control unit
cable harness.
Check the sensor resistance and
compare it with the curve.
Replace the sensor in case of
severe deviation.
5. Flue gas monitoring sensor:
Pull the leads from the sensor.
Check the sensor resistance and
compare it with the curve.
Replace the sensor in case of
severe deviation.
Note
Function check of the flue gas moni-
toring device facility, see page 28.
Troubleshooting
37