
34
Displayed
fault code
System characteris-
tics
Cause
Measures
F4
Burner in a fault
state
No flame signal
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).
F6
Burner in a fault
state
Flue gas monitor
has responded
Check flue gas monitoring
sensor (see page 38).
Switch ON/OFF switch
8
OFF and ON again (or
reset, see F2).
F30
Burner blocked
Short circuit, boiler
water temperature
sensor
Check the boiler water
temperature sensor (see
page 38).
F38
Burner blocked
Lead break, boiler
water temperature
sensor
Check the boiler water
temperature sensor (see
page 38).
F50
No DHW heating
Short circuit, cylin-
der temperature
sensor (gas sys-
tem boiler)
Check the sensor (see
page 38).
F51
No DHW heating
Short circuit, outlet
temperature sen-
sor (gas combi
boiler)
Check the sensor (see
page 38).
F58
No DHW heating
Lead break, cylin-
der temperature
sensor (gas sys-
tem boiler)
Check the sensor (see
page 38).
F59
No DHW heating
Lead break, outlet
temperature sen-
sor (gas combi
boiler)
Check the sensor (see
page 38).
Troubleshooting
Fault messages on the display
(cont.)
5441 514 UAE