Observation:

Rating (hxi range only)
Turn potentiometer C to MAX setting (fully clockwise).
Adjust potentiometer A to set correct fan speed (display will flash fan speed).
Once fan speed has been set turn potentiometer C back to run position (fully anti clockwise).
Boiler NameFan Speed
12hxi27
12hxi32
18hxi41
24hxi47
30hxi57
38hxi57
BG33019 to 47 (see note)

Note:
The BG330 can be range rated from 12kW to 31kW.
Refer to the appliance data badge for more information.