System Gassing Troubleshooting - Worcester Greenstar 4000 User Instructions

▶ 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.
▶ Worcester, Bosch Group have available on our website helpful videos
in the Customer service section to aid in thawing a frozen pipe.
▶ Reset the appliance and wait two or three minutes for the appliance
to restart.
▶ Contact Worcester, Bosch Group Appointments Team on:
0330 123 9339, if the boiler does not restart.
▶ Contact your installer in order to find a permanent solution to the
problem.
8.3

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.
▶ Do not vent air from radiators whilst the central heating is switched
on; turn your boiler off.
▶ 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
▶ This must be properly addressed to prevent serious damage to the
entire system.
▶ Failure to properly maintain the heating system may affect your
warranty.
Greenstar 4000 – 6 720 891 170 (2020/09)
Malfunction or failure
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