Gas Type Conversion (Only For Operation With Lpg); Function Sequence And Possible Faults - Viessmann FB2A Installation And Service Instructions For Contractors

Commissioning, inspection, maintenance
Further details regarding the individual steps

Gas type conversion (only for operation with LPG)

Function sequence and possible faults

Control unit
issues heat
demand
Yes
Fan starts
30
Display screen
No
No
after approx. 51 s
fault F9
(cont.)
1. Set adjusting screw A at the gas
train to "2".
2. Switch ON/OFF switch
3. Select the gas type in coding address
"82":
■ Call up code 2 (see page 72)
■ Call up general
■ In coding address "11", select
value "9".
■ In coding address "82", select
value "1" (operation with LPG).
■ In code "11" select value ≠ "9".
■ End service functions.
4. Open the gas shut-off valve.
5. Affix label "G31" (included with the
technical documentation) adjacent to
the type plate on the cover panel.
ON.
Measures
Increase set value
and ensure heat is
drawn off
Check the fan, fan
connecting cables,
power at the fan
and fan control