Worcester HEATSLAVE 12/14 User Instructions & Customer Care Manual page 10

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If the pressure falls below this minimum level, the system
must be re-pressurised using the method described by your
installer.
To ensure that the boiler and system are full of water and
pressurised, check the pressure gauge indicator needle. Consult
your installer or service engineer if the system continues to lose
pressure, as this could indicate a leak.
MAINS SERVICE INTERRUPTIONS
In the event of mains water supply failure, no hot water will
be available from the boiler. However, the central heating system
will continue to operate.
If the electricity supply fails, the boiler will not operate. When
the supply is restored, the boiler will return to normal operation,
but you should check that the programmer has maintained your
required settings.
LOOKING AFTER YOUR
BOILER AND SYSTEM
It is essential that your boiler is serviced by a competent engi-
neer, as previously described on page 4. These notes will also be
helpful in maintaining your boiler's efficiency and performance.
CLEANING
Use a damp cloth and a small amount of detergent to clean
the boiler casing. Never use abrasive cleaners.
FROST PRECAUTIONS
To protect your central heating system from freezing, your
installer may have fitted a mains voltage frost thermostat. If so,
your boiler should only be switched OFF at the user operating
switch (or programmer), otherwise the burner will not operate
when there is a demand via the frost thermostat.
If your boiler has not been fitted with a frost thermostat and
is not to be used during a long period of cold weather, the boiler
and the system should be drained to prevent freezing. If your boil-
er is not to be used during short periods of cold weather, leave it
on a low temperature setting.