Viessmann VITODENS 333-F WS3A Service Instructions Manual page 87

Repairs
(cont.)
Checking and replacing the differential pressure sensor
1. Pull the leads from temperature
limiter A.
2. Check the continuity of the tem-
perature limiter with a multimeter.
3. Remove the faulty temperature lim-
iter.
4. Coat the replacement temperature
limiter with heat conducting paste
and install it.
5. After commissioning, press reset
button "E" at the control unit.
In the event of fault messages that
concern the differential pressure sen-
sor, check the following:
Seat of differential pressure meter
A
Plug-in electrical connection
If the fault persists, replace the differ-
ential pressure sensor.
Troubleshooting
87