Replacement parts
65
Greenstar 4000 – 6 720 891 162 (2020/09)
9
Replacement parts
WARNING
Mains supplies - Isolate the appliance
▶ Turn off the gas supply and isolate the mains electrical supply before
starting any work and observe all relevant safety precautions.
▶ Drain the appliance/system where necessary and protect any
electrical equipment from water ingress during component
replacement.
WARNING
Component replacement:
▶ After replacement of a gas carrying component, where a gasket or
seal has been disturbed or replaced, check for gas tightness using a
gas sniffer/leak detection fluid.
▶ On re-assembly check all affected seals for cracks, hardness and
deterioration.
If damaged or in any doubt the seal must be replaced.
▶ Also after re-assembly, carry out the following checks:
Fan pressure.
Flue gas analysis.
Only use Worcester, Bosch Group original spare parts with this
appliance. Non Worcester, Bosch Group original spare parts will
invalidate the guarantee (if applicable) and any warranty.
▶ A comprehensive list of appliance spares can be found on the website
www.worcester-bosch.co.uk/spares
9.1
Component access
Removing the front casing
The front casing is secured with two screws which are critical to maintain
the case seal and to prevent unauthorised removal (electrical safety).
▶ Always secure the casing with these screws.
▶ Loosen the two screws [1] and pull the bottom of the casing forward.
▶ Lift off the casing.
Fig. 86 Removing the front casing
9.2
Draining the appliance
NOTICE
Risk of water damage to appliance or property!
Damage from disconnecting water pathways which may have retained
some water.
▶ Take care after draining the appliance to protect equipment/property
from residual water content within components.
Many of the tasks in this section require that the appliance be isolated
and drained.
▶ Before working on any water carrying pipework and components
drain the appliance.
▶ Connect a suitable hose firmly to the drain point and run the hose
outside to a suitable point or container.
▶ Turn the drain valve a ¼ turn anti-clockwise to open the drain. Turn
the valve firmly clockwise to close.
0010031864-001
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