Diagnosis; Checking Operating Data - Viessmann B1HF Installation And Service Instructions Manual

Diagnosis and service checks

Diagnosis

Checking operating data

Operating data can be checked in various areas. See
"Diagnosis" in the service menu overview.
Operating data on heating circuits with mixer can only
be called up if such components are installed in the
system.
Note
If a called up sensor is faulty, "- - -" appears on the
display.
Calling up operating data
Tap the following buttons:
1. and OK simultaneously for approx. 4 s, then
release.
64
2. Use / to select "b.3" for diagnostics.
3. OK
4. Use / to select the required entry.
Note
"d.8" Use / to view the heat generator serial
number in sections.
5. OK