Water filter maintenance
• The water lter supplied with this unit is designed to both
protect the boiler and remove sediment, chlorine and other
potentially harmful contaminants.
• Changing the lter cartridge every 6 months will keep the boiler
in good condition. Franke will not accept responsibility for boiler
failures due to the build-up of lime-scale if the lter cartridge
has not been replaced at the recommended 6 month intervals.
• The occasional wash in warm soapy water is sufcient to keep
the plastic housing clean. Under no circumstances should the
plastic lter housing come into contact with any proprietary
cleaners such as kitchen sprays, bleach etc. as contact with
certain chemicals can degrade the plastic and cause it to fail.
• The plastic housing must be replaced every 10 years due to the
tendency of plastic materials to degrade and weaken over time.
• A smear of WRAS approved silicon grease applied to the lter
sump thread and to the rubber sealing ring in the head of the
lter at each cartridge change will make it easier to unscrew the
sump. Only a WRAS approved alternative grease must be used
for this purpose. Non-approved greases may degrade both the
seal and the plastic housing and lead to eventual failure. Small
tubes of WRAS approved silicon grease are available at
www.frankelterow.co.uk
Changing the filter cartridge
1. Operate the switch on the front of the boiler to switch off the
boiler power supply.
2. Shut off the water supply to the lter using the adjacent stop-
valve.
3. Press the red button at the top of the lter unit to exhaust the
pressure in the system. It will not be possible to unscrew the
lter canister if this operation is not carried out.
4. Place a shallow container in the cabinet to catch any water
residues when removing the lter sump. Grip the sump rmly
and turn it rmly to the left to break the seal. Unscrew the
sump by hand until it separates from the head of the lter.
5. If the old cartridge does not automatically fall free press down
on the top mount of the cartridge to release it. Remove the old
cartridge and discard the remaining water in the sump.
6. Remove the new lter cartridge from its packaging, wet the “O”
seal and place it in the lter sump. Position the sump, with the
cartridge inside, under the lter head and screw it in place. The
cartridge should engage automatically. Tighten the sump, suf
cient to make a water tight seal.
7. Turn the water supply ‘on’ and check the system carefully for
leaks.
8. Operate the system and run the boiling water for a few
moments until the water runs clear. Run the boiling water
for a moment to release any trapped air.
9. Turn the boiler power supply back on.
10. Press and hold the reset button on the lter change indicator
module for 5 seconds. The LED light on the tap will glow red,
followed by yellow, and then the module will emit an audible
beep. The lter change indicator is now reset.
Resetting the Boiler
There is a safety reset mechanism on the tank that will shut it
down if the boiler is turned on without being full of water or in
certain operating environments. If the tank is not producing
boiling water carry out the following procedure to reset it:
1. Switch off the power to the boiler using the switch on the front.
2. Carefully tilt the boiler backwards to gain access to the reset
button located on the base of the boiler. The location of the
button is highlighted by a silver sticker.
3. Inset a 2.5mm Allen Key or other suitably thin implement 2cm
into the hole and hold it there for 4 seconds.
4. Reposition the tank and switch the power back on using the
switch on the front.
5. Allow approximately 20 minutes for the boiler to reach full
operating temperature, indicated by the lower LED turning
green.
Sensible precautions
If you are planning to leave the premises for an extended period
(over a week) it is a sensible precaution to turn off both the
electricity supply and the water supply to your Franke Omni
system.