Worcester, Bosch Group
Cotswold Way, Warndon, Worcester WR4 9SW.
Tel. 0330 123 9559
Worcester, Bosch Group is a brand name of Bosch Thermotechnology Ltd.
worcester-bosch.co.uk
6 720 821 751 (2018/04)
WORCESTER, BOSCH GROUP:
TECHNICAL SUPPORT:
0330 123 3366
APPOINTMENTS:
0330 123 9339
SPARES:
0330 123 9779
LITERATURE:
0330 123 9119
TRAINING:
0330 123 0166
SALES:
0330 123 9669
In the unlikely event the boiler does not give complete
satisfaction, before calling for a Service Engineer, the
Installer should check the following:-
General checks
▶ Is there 230V across the terminals L and N? If not there is no demand to the boiler
from the controls or the control wiring is not correct.
▶ Is the polarity correct? (230V across live and earth, 0V across neutral and earth)
▶ Is the air bled from the primary system?
▶ Is the air bled from the oil supply?
▶ Is the flue sized and routed correctly?
Boiler runs straight to lockout
▶ Has the oil line been purged of air?
▶ Where an air eliminator is used in conjunction with a top feed oil tank the non-
return valve, (if fitted), should be removed from the oil dip pipe.
No domestic hot water
▶ Is there a domestic hot water demand from the programmer and has the tank
reached temperature?
▶ Is the circulating pump operating?
▶ Are the programmer, tank thermostat, circulating pump and diverter valve/zone
valves wired correctly?
▶ Is there 230V across L and N? If not there is no demand to the boiler from the
controls or the controls wiring is not correct.
No central heating
▶ Are both programmer and room thermostat on demand for central heating?
▶ Are the room thermostat, programmer, circulating pump and diverter valve/zone
valves (if CH and DHW system) wired correctly?
▶ Is the circulating pump operating?
▶ Is there 230V across L and N? If not there is no demand to the boiler from the
controls or the controls wiring is not correct.