Viessmann WB1A Series Installation And Service Instructions Manual page 42

Start-up, Inspection and Maintenance
Overview of Controls and Indicators
42
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F
psi
SERV
(continued)
Legend
Display value or fault code
Heating mode
Burner in operation
Current burner firing rate
Boiler water temperature in °F
(combined with display value)
Fault
System pressure (combined with
display value)
Emissions test activated (only for
licensed professional heating
contractor)