Malfunction or failure
Greenstar 8000 + – 6721890764 (2024/06)
12
If the condensate pipe has frozen:
Ā Locate the blockage.
– It is likely that the pipe is frozen at the most exposed point outside
the building or where there is an obstruction to flow. This could be
the open end of the pipe, at a bend or elbow, or where there is a
sag in the pipe in which condensate can collect.
– The location of the blockage should be identified as closely as
possible before taking further action.
Ā Thaw the frozen pipe.
– The pipe can be thawed by applying a hot water bottle, a
microwaveable heating pack (the sort used for muscular aches
and pains) or a cloth soaked in hot water to the exterior of the
pipe, close to the point of blockage.
– Hot water, but not boiling, can also be poured onto the pipe from
a watering can or similar container.
– Care must be taken at pedestrian areas where this water may
freeze and create a slip hazard.
Ā Worcester, Bosch Group have available on our website helpful videos
in the Customer Service section to aid in thawing a frozen pipe.
Ā Reset the appliance and wait two or three minutes for the appliance
to restart.
Ā Contact Worcester, Bosch Group Appointments Team on:
0330 123 9339, if the boiler does not restart.
Ā Contact your installer in order to find a permanent solution to the
problem.
9.4 System gassing troubleshooting
WARNING
Caution must be exercised when venting radiators or adjusting
system pressure after commissioning of your boiler.
Do not repeatedly vent your radiators, if symptoms persist, contact a
heating engineer.
Ā Do not vent air from radiators whilst the central heating is switched
on; turn your boiler off.
Ā Whilst venting radiators, do not allow the pressure on the boiler to
drop below the pressure at which it is normally set.
CAUTION
If the pressure in your heating system is repeatedly rising (this can
be checked via the boilers pressure gauge or digital display and
should be checked when the system is cold), and especially if you
need to keep venting the radiators, urgent action is required and
you must contact a heating engineer. This can indicate that there is
corrosion occurring within the heating system
Note: Ensure the reading stays between minimum and maximum
operating pressures at all times whilst the boiler is operating
Ā This must be properly addressed to prevent serious damage to the
entire system.
Ā Failure to properly maintain the heating system may affect your
warranty.
Table 8 System gassing flow chart
Is your system pressure constantly increasing even when the boiler is off for extended periods of time?
T T
NO YES
T T
Does system pressure increase when the boiler is on?
Can you confirm that the filling link is not stuck open/
passing water in any way?
T T T T
NO YES YES NO
T T T T
Is your system pressure regularly
dropping (i.e. you constantly have to
top up your boilers pressure)
Does system pressure increase to
the high pressure red zone on the
pressure gauge/display?
Does the problem
persist?
Contact a service
engineer
X YES X
T
NO
T T T T T
NO YES NO YES
The boiler is fineT T T T
The boiler is fine
Contact a service
engineer
The boiler is fine
Contact a service
engineer
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