Viessmann VITOPEND 200 Installation And Service Instructions Manual page 93

Repairs
(cont.)
Checking the outlet temperature sensor
A Outlet temperature sensor
Checking the 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
(display "E").
1. Pull the leads off the outlet tem-
perature sensor.
2. Check the sensor resistance and
compare it with the curve.
3. Replace the sensor in case of
severe deviation.
Danger
The outlet temperature sen-
sor is immersed in the DHW
(risk of scalding).
Drain the secondary side of
the boiler before replacing
the sensor.
Troubleshooting
93