Viessmann Vitopend 100-W Installation And Service Instructions Manual page 34

Troubleshooting
Fault messages 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
34
(cont.)
Cause
No flame signal
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)
Measures
Check the ionisation elec-
trode and connecting ca-
bles, check the gas pres-
sure, check the gas train,
check the ignition and ig-
nition module.
Switch ON/OFF switch
8 OFF and ON again (or
reset, see F2).
Check flue gas monitoring
sensor (see page 38).
Switch ON/OFF switch
8 OFF and ON again (or
reset, see F2).
Check the boiler water
temperature sensor (see
page 38).
Check the boiler water
temperature sensor (see
page 38).
Check the sensor (see
page 38).
Check the sensor (see
page 38).
Check the sensor (see
page 38).
Check the sensor (see
page 38).