Do you have a question about the Horstmann BX2000 and is the answer not in the manual?
Installation must be done by a qualified person per wiring regulations. Isolate mains before work.
Press 1 or 2 hour button for boost. Boost cancels if Off-Peak supply becomes available.
Explains OFF PEAK ACTIVE, 1 HOUR, and 2 HOUR Boost indicators.
Details the NORMAL and OFF PEAK supply isolator switches and their function.
The unit is not user serviceable. Contact a qualified engineer for faults.