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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)?
3. Is the air bled from the primary system?
4. Is the air bled from the oil supply?
5. 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 domestic hot water
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 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
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 L and N? If not there is no demand to the boiler
from the controls or the controls wiring is not correct.
NOTICE: APPLIANCE OPERATION
UNDER NO CIRCUMSTANCES MUST AN
APPLIANCE BE LEFT TO OPERATE WITH ANY
CONTROL LINKED OUT OR OVER RIDDEN.
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
6 721 846 263 (2022/01)
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
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