Grant Boilerhouse fault codes

7 codes from the Grant manual for the Boilerhouse oil boiler. Pick one for what it means, the likely causes and where to start.

Code	What it means
1	Visible smoke from flue or high smoke number
2	Burner pulses
3	Flame slow to stabilise during start up
4	Water temperature low
5	Boiler operating on overheat thermostat
6	Fumes and puffing during starting (conventional flue)
8	Combustion fumes smell