Belling GOURMET 900 DF Service Manual page 74

Gas hob with thermocouples
Hob burner will not stay lit
Burner won't stay on when
control knob released
Is the customer keeping the control
NO
knob depressed for 10 secs.
YES
Advise customer control knob
must be kept depressed for at
least 10 secs
Ask customer is the
thermocouple probe is in the
NO
flame
Ask customer to clean burner
YES
skirt and cap also to make sure
they are correctly fitted.
Then send engineer, order
thermocouple and gas tap.