5
1 Litre indicator (types HD 4637 and HD 4637/6)
The indicator will turn orange when the kettle is
filled with one litre of water (or more) (fig. 4).
Switching on
- Place the kettle on the base unit (D) (fig. 5).
- Switch the kettle on (fig. 6).
Switching off
- The kettle will switch off automatically once the
water boils (fig. 7a)
- You can switch the kettle off manually at any
time (fig. 7b).
Some time after switching off, a click may be
heard. This is of no importance.
Switching on again?
- You can switch the kettle on again after letting
it cool down for at least half a minute.
Cleaning
• Disconnect the base unit from the mains before
cleaning.
• The outside of the appliance can be cleaned by
simply wiping with a cloth moistened with soapy
water.
• Do not use abrasive cleaners, scourers, etc.
Filterline scale filter (types HD 4637,
HD 4637/3, HD 4637/6 and HD 4637/9)
Limescale deposit
Limescale is a harmless deposit which is naturally
formed when hard water is heated.
The amount of scale deposit (and thus the need
to descale your kettle) largely depends on the
hardness of the tapwater in your area and the
frequency with which you use your kettle.
Limescale is not harmful to your health, but it
gives a powdery taste to your beverage.
The “Filterline” scale filter (E) is designed to
prevent scale particles from being poured into
your beverage by trapping them within the kettle.
The scale filter is removable to enable cleaning
and replacement.
Cleaning the scale filter
As the scale filter traps the scale particles it needs
regular cleaning to maintain easy filling and
pouring of the kettle.
The scale filter can be cleaned by
- removing it from the kettle (make sure no hot
water is in the kettle)
- and running it under the tap while gently
brushing with a soft nylon brush (fig. 8)
- and/or by soaking the filter in vinegar or a
proprietary descaling agent overnight.
You can also clean the scale filter by leaving it in
the kettle during descaling of the whole appliance.
See under “Descaling your Kettle”.
After the scale filter is cleaned, simply replace it
in the kettle (fig. 9).
Make sure never to leave the scale filter loose
inside the kettle.
Replacement scale filter
Replacement scale filters can be obtained from
your Philips dealer under type n° HD 4967.
Types HD 4637, HD 4637/3, HD 4637/6 and
HD 4637/9 are supplied with a scale filter.
Replacement filter type n° HD 4967 fits all models
in the HD 4630-37.
Descaling your kettle
Excess limescale will shorten the life of the
heating element and may cause your kettle to
start functioning improperly.
To ensure a continuous high level of performance
and to prevent the appliance from being affected
by limescale, we advise you to descale your kettle
regularly.
How often you need to descale your kettle
depends on the hardness of the water in your
area and the frequency with which you use the
appliance.
Follow the manufacturer’s instructions, if you
descale with a proprietary descaling agent.
Alternatively, proceed as follows:
- Boil 700 ml of water in your kettle.
- After switch-off, add 300 ml of normal (8%)
vinegar to the water in the kettle.
- Leave the solution to stand in the kettle
overnight.
- Empty the solution out and rinse the inside
of the kettle thoroughly with clean water.
- Fill the kettle with clean water and bring to
the boil.
- Empty the kettle and rinse again with clean
water.
If scale remains, repeat the procedure.
