Viessmann Vitopend 100-W Installation And Service Instructions For Contractors page 39

Fault indicators on the display
Displayed System characteris-
fault code tics
F4 Burner in a fault
state
F6 Burner in a fault
state
F30 Burner blocked
F38 Burner blocked
F50 No DHW heating
F51 No DHW heating
F58 No DHW heating
F59 No DHW heating
(cont.)
Cause
No flame signal de-
tected
Flue gas monitor
has responded
Short circuit, boiler
water temperature
sensor
Lead break, boiler
water temperature
sensor
Short circuit, cylin-
der temperature
sensor (gas sys-
tem boiler)
Short circuit, outlet
temperature sen-
sor (gas combi
boiler)
Lead break, cylin-
der temperature
sensor (gas sys-
tem boiler)
Lead break, outlet
temperature sen-
sor (gas combi
boiler)
Troubleshooting
Measures
Check the ignition/ionisa-
tion electrodes and con-
necting leads, check the
gas pressure, check the
gas train, check the igni-
tion and ignition module.
Turn ON/OFF switch 8
off and on again (or reset,
see F2).
Check flue gas monitoring
sensor (see page 43).
Turn ON/OFF switch 8
off and on again (or reset,
see F2).
Check boiler water tem-
perature sensor (see
page 43).
Check boiler water tem-
perature sensor (see
page 43).
Check sensor (see
page 43).
Check sensor (see
page 43).
Check sensor (see
page 43).
Check sensor (see
page 43).
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