If 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
1. Is there 230V across the boiler live and neutral terminals?
2. Is the polarity correct? (230V across live and earth, 0V across neutral and earth)
2. Is the air bled from the primary system?
3. Is the air bled from the oil supply?
4. Is the flue sized and routed correctly?
Boiler runs straight to lockout
1. Has the oil line been purged of air?
2. 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.
Boiler locks out at the start of a demand
(Heating off overnight for example)
1. If an air eliminator is being used, check that there are no leaks that allow
air to be pulled into the oil supply.
2. If a two pipe oil supply is a being used, has a non-return valve
been fitted to the inlet pipe? Refer to the instructions for guidelines.
No central heating
1. Are both programmer and room thermostat on demand for central heating?
2. Are the room thermostat, programmer, circulating pump and diverter
valve/zone valves (if CH and DHW system) wired correctly?
3. Is the circulating pump operating?
4. Is there 230V across pin 3 and N? If not there is no demand to the
boiler from the controls or the controls wiring is not correct.
No domestic hot water (if applic
able)
1. Is there a domestic hot water demand from the programmer and has the
tank reached temperature?
2. Is the circulating pump operating?
3. Are the programmer, tank thermostat, circulating pump and diverter
valve/zone valves wired correctly?
4. Is there 23
0V across pin 3 and N? If not there is no demand to the
boiler from the controls or the controls wiring is not correct.
EXCELLENCE COMES AS STANDARD
Worcester, Bosch Group
Cotswold Way, Warndon, Worcester WR4 9SW.
Tel. 01905 754624 Fax. 01905 754619
W
orcester
, Bosch Group is a brand name of BBT
Thermotechnology UK Ltd.
www
.wor
cester-bosch.co.uk
8 7
1
6 1
1
3 000a (0
1/07)
CONTACT INFORMATION
WORCESTER, BOSCH GROUP:
TECHNICAL: 08705 266241
SERVICE: 08457 256206
SPARES: 01905 752571
LITERATURE: 01905 752556
TR
AI
N
ING: 01905 752526
SALES: 01905 752640
W
EBSITE: www.worcester-bosch.co.uk
WATER TREATMENT:
F
E
RNOX 01799 550811
www.fernox.com
S
E
NTI
N
EL 0151 420 9595
www.betzdearborn.com/sentinel
FLUE TERMINAL GUARD:
PART No. 7 716 190 050
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