
BOOST will work from any running mode.
BOOST is entered by pressing /ďƵƩŽŶ
EŽƚĞƚŚĞWƌŽŐƌĂŵŵŝŶŐƐůŝĚĞƌŵƵƐƚďĞŝŶƚŚĞ ƉŽƐŝƟŽŶ
KK^dŝƐĐĂŶĐĞůůĞĚďLJĂŶLJƉƌĞƐƐŽĨďƵƩŽŶŵŽǀĞŵĞŶƚŽĨĚŝĂůŽƌƐůŝĚĞƌ
tŚĞŶKK^dŝƐƌƵŶŶŝŶŐƚŚĞƟŵĞĂŶĚĚĂLJĚŝƐĂƉƉĞĂƌdŚĞŵŝŶƵƚĞĂƌƌĂLJǁŝůůĐŽƵŶƚĚŽǁŶ
ĨƌŽŵϲϬʹϬƚŽŝŶĚŝĐĂƚĞƟŵĞůĞŌŝŶKK^dŵŽĚĞ
Registered trademarks - All rights reserved
4
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Registered in England and Wales No: 9543404
dĞůнϰϰ;ϬͿϮϬϳϭϮϱϬϮϯϲͲ&Ădžнϰϰ;ϬͿϮϬϳϭϮϱϬϮϲϳͲͲŵĂŝůĐŽŶƚĂĐƚƵŬΛŶĞŽŵŝƟƐĐŽŵ
FACTORY SETTINGS
ůů>ĚŝƐƉůĂLJǁŝůůďĞƚƵƌŶĞĚKEĨŽƌϮƐĞĐŽŶĚƐĂŶĚƚŚĞĨĂĐƚŽƌLJƐĞƫŶŐƐǁŝůůďĞƌĞƐ-
tored.
EŽƚĞdŽƌĞƐƚŽƌĞĨĂĐƚŽƌLJƐĞƫŶŐƐƉƌĞƐƐĂŶĚŚŽůĚĚŽǁŶƚŚŝƐƉĂƌƚĨŽƌŵŽƌĞƚŚĂŶϯ
ƐĞĐŽŶĚƐƵƐŝŶŐƚŚĞƟƉŽĨĂƉĞŶ
^ĞƫŶŐƐ &ĂĐƚŽƌLJƐĞƫŶŐƐ
ŽŵĨŽƌƚƚĞŵƉĞƌĂƚƵƌĞ 20°C
ĐŽƚĞŵƉĞƌĂƚƵƌĞ 16°C
ŽŵĨŽƌƚƉĞƌŝŽĚϭ ^ƚĂƌƚĂƚϬϲϯϬam ŶĚĂƚϬϴϯϬam
ŽŵĨŽƌƚƉĞƌŝŽĚϮ ^ƚĂƌƚĂƚϭϮϬϬpm ŶĚĂƚϬϮϬϬpm
ŽŵĨŽƌƚƉĞƌŝŽĚϯ ^ƚĂƌƚĂƚϬϱϬϬpm ŶĚĂƚϭϬϬϬpm
dŚĞďŽŝůĞƌŝƐŶŽƚŚĞĂƟŶŐ
- Check that the Thermostat is calling for heat if yes then the thermostat would appear
ƚŽďĞǁŽƌŬŝŶŐĐŚĞĐŬƚŚĂƚƚŚĞďŽŝůĞƌŚĂƐŶŽƚƐǁŝƚĐŚĞĚŝƚƐĞůĨŽī
If no increase set temperature.
- In the event of a power failure or the thermostat being disconnected, the thermostat
ǁŝůůŵĂŝŶƚĂŝŶŝƚƐƉƌŽŐƌĂŵŵĞĚƐĞƫŶŐƐĨŽƌƵƉƚŽϭϬ,ŽƵƌƐ
dŚĞƌŽŽŵƚĞŵƉĞƌĂƚƵƌĞŝƐŶŽƚŚŝŐŚĞŶŽƵŐŚƚŚĞďŽŝůĞƌŝƐŶŽƚƉƌŽǀŝĚŝŶŐĞŶŽƵŐŚŚĞĂƚ
ͲŚĞĐŬƚŚĞĂĐƟǀĞŽƉĞƌĂƟŶŐŵŽĚĞ(see page 3) - the room thermostat may be in an Eco,
Standby or Auto Mode entailing a temperature drop.
ͲŚĞĐŬƚŚĞĂĐƟǀĞĚĞƐŝƌĞĚƚĞŵƉĞƌĂƚƵƌĞĂŶĚŝŶĐƌĞĂƐĞŝƚŝĨŶĞĞĚĞĚ(see page 3).
dŚĞƚĞŵƉĞƌĂƚƵƌĞŝŶƚŚĞƌŽŽŵŝƐůŽǁĞƌƚŚĂŶƚŚĞƐĞƚƉŽŝŶƚƚĞŵƉĞƌĂƚƵƌĞ
- Check the programming. The thermostat could be in a scheduled Eco period.
ͲŶƐƵƌĞƚŚĂƚƚŚĞƟŵĞĚŝƐƉůĂLJĞĚŝƐƚŚĞƐĂŵĞĂƐƚŚĞĐƵƌƌĞŶƚƟŵĞ
zŽƵŵĂĚĞĂŵŝƐƚĂŬĞǁŚŝůĞƐĞƫŶŐ
ͲzŽƵũƵƐƚŶĞĞĚƚŽƌĞƐƚŽƌĞĨĂĐƚŽƌLJƐĞƫŶŐƐĂƐĞdžƉůĂŝŶĞĚŝŶƚŚĞ&ĂĐƚŽƌLJƐĞƫŶŐƐƐĞĐƟŽŶ
(see page 4). This will reverse any changes you might have made.
dŚĞƐLJƐƚĞŵŝƐŶŽƚŚĞĂƟŶŐďƵƚ ŝƐŽŶ
- If and indicator light is on but the system remains cold, then you should contact your
installer.
dŚĞƚŚĞƌŵŽƐƚĂƚŝƐ ƉƌŽŐƌĂŵŵĞĚĂŶĚ LJŽƵ ŽďƐĞƌǀĞ Ă ĚĞůĂLJďĞƚǁĞĞŶƚŚĞĂĐƟǀĞŵŽĚĞ
ŽŵĨŽƌƚŽƌĐŽĂŶĚLJŽƵƌƌĞƋƵŝƌĞŵĞŶƚ
Ͳ dŚĞŽƉƟŵŝƐĂƟŽŶĨƵŶĐƟŽŶĐĂŶŐĞŶĞƌĂƚĞƐůŝŐŚƚŽīƐĞƚƐƚŽŐƵĂƌĂŶƚĞĞƚŚĞůĞǀĞůŽĨĐŽŵĨŽƌƚ
ĂƚƚŚĞƌŝŐŚƚƟŵĞŽƌƚŽƐĂǀĞĞŶĞƌŐLJďLJƐůŝŐŚƚůLJĂŶƟĐŝƉĂƟŶŐĂŶĐŽƉĂƐƐĂŐĞ
,ĞĂƟŶŐĐŽŵĞƐ ŽŶ ďĞĨŽƌĞƉƌŽŐƌĂŵŵĞĚƐƚĂƌƚ ƟŵĞ ĂŶĚ ĐŽŵĞƐ Žī ĂŌĞƌƉƌŽŐƌĂŵŵĞĚ
ĞŶĚƟŵĞ
- Thermostat maybe set to OPTI Comfort mode. The thermostat will start the boiler at
ƚŚĞŽƉƟŵƵŵƟŵĞƚŽĂĐŚŝĞǀĞƚŚĞƐĞƚƉŽŝŶƚƚĞŵƉĞƌĂƚƵƌĞĂƚƚŚĞƐƚĂƌƚŽĨƚŚĞŽĐĐƵƉĂŶĐLJ
period. ;KŶĐŽůĚĚĂLJƐLJŽƵƌŚĞĂƟŶŐŵĂLJĐŽŵĞŽŶĞĂƌůŝĞƌƚŚĂŶĞdžƉĞĐƚĞĚŝŶŽƌĚĞƌĨŽƌ
ƚŚĞƉƌŽŐƌĂŵŵĞĚŽĐĐƵƉŝĞĚƚĞŵƉĞƌĂƚƵƌĞƚŽďĞĂĐŚŝĞǀĞĚͿ.
Ͳ dŽĐŚĂŶŐĞƚŚĞŽƉƟŵŝƐĂƟŽŶƚLJƉĞƌĞĨĞƌƚŽƚŚĞŝŶƐƚĂůůĂƟŽŶŝŶƐƚƌƵĐƟŽŶƐ
,ĞĂƟŶŐ ĚŽĞƐ ŶŽƚ ĐŽŵĞ ŽŶ Ăƚ ƉƌŽŐƌĂŵŵĞĚ ƐƚĂƌƚ ƟŵĞ ĂŶĚ ĐŽŵĞƐ Žī ďĞĨŽƌĞ ƉƌŽ-
ŐƌĂŵŵĞĚĞŶĚƟŵĞ
- Thermostat maybe set to OPTI ECO mode. The thermostat will stop the boiler at the
ŽƉƟŵƵŵƟŵĞƚŽƐůŝŐŚƚůLJƌĞĚƵĐĞƚŚĞƐĞƚƉŽŝŶƚƚĞŵƉĞƌĂƚƵƌĞďĞĨŽƌĞƚŚĞĞŶĚŽĨƚŚĞŽĐĐƵ-
TROUBLESHOOTING
In the event of a power failure or the thermostat being disconnected, the thermostat
ǁŝůůŵĂŝŶƚĂŝŶŝƚƐƉƌŽŐƌĂŵŵĞĚƐĞƫŶŐƐĨŽƌƵƉƚŽϭϬ,ŽƵƌƐ
TECHNICAL SPECIFICATIONS
/ŶƐŽŵĞŝŶƐƚĂŶĐĞƐƚŚĞƵŶŝƚŵĂLJŚĂǀĞďĞĞŶƐĞƚǁŝƚŚƚŚĞƐĞƌǀŝĐĞŝŶƚĞƌǀĂůĨƵŶĐƟŽŶĞŶĂďůĞĚ
LJ>ĂǁŝŶƌĞŶƚĞĚĂĐĐŽŵŵŽĚĂƟŽŶLJŽƵƌŐĂƐďŽŝůĞƌƐŚŽƵůĚďĞŝŶƐƉĞĐƚĞĚƐĞƌǀŝĐĞĚĂŶŶƵĂů-
ly to ensure it is working correctly.
dŚŝƐŽƉƟŽŶŝƐĚĞƐŝŐŶĞĚƚŽƌĞŵŝŶĚƚŚĞĞŶĚƵƐĞƌƚŽĐŽŶƚĂĐƚƚŚĞƌĞůĞǀĂŶƚƉĞƌƐŽŶƚŽŚĂǀĞ
the annual service carried out on the boiler.
dŚŝƐĨƵŶĐƟŽŶǁŝůůďĞĞŶĂďůĞĚĂŶĚƉƌŽŐƌĂŵŵĞĚďLJLJŽƵƌ/ŶƐƚĂůůĞƌŵĂŝŶƚĞŶĂŶĐĞŶŐŝŶĞĞƌ
or Landlord.
If it has been set to do so, the unit will display a message on the screen to remind you
that a boiler service is due.
The Service Due Soon countdown will be indicated up to 50 days before the Service is
ĚƵĞƚŽĂůůŽǁƟŵĞƚŽĂƌƌĂŶŐĞĨŽƌĂŶĞŶŐŝŶĞĞƌƚŽĂƩĞŶĚŶŽƌŵĂůĨƵŶĐƟŽŶƐǁŝůůĐŽŶƟŶƵĞ
during this stage.
At the end of this service due soon period, the unit will go to Service Due OFF at which
point only the 1hour boost will operate on the thermostat, it will operate at 20°C during
this hour.
NOTE
ĂŶĞdžƉůĂŶĂƟŽŶĨŽƌŚŽƵƐĞŚŽůĚĞƌƐ
A room thermostat simply switches the
ŚĞĂƟŶŐ ƐLJƐƚĞŵ ŽŶ ĂŶĚ Žī ĂƐ ŶĞĐĞƐƐĂƌLJ
It works by sensing the air temperature,
ƐǁŝƚĐŚŝŶŐ ŽŶ ƚŚĞ ŚĞĂƟŶŐ ǁŚĞŶ ƚŚĞ Ăŝƌ
temperature falls below the thermostat
ƐĞƫŶŐ ĂŶĚ ƐǁŝƚĐŚŝŶŐ ŝƚ Žī ŽŶĐĞ ƚŚŝƐ ƐĞƚ
temperature has been reached.
Turning a room thermostat to a higher set-
ƟŶŐ ǁŝůů ŶŽƚ ŵĂŬĞ ƚŚĞ ƌŽŽŵ ŚĞĂƚ ƵƉ ĂŶLJ
faster. How quickly the room heats up de-
ƉĞŶĚƐŽŶƚŚĞĚĞƐŝŐŶŽĨƚŚĞŚĞĂƟŶŐƐLJƐƚĞŵĨŽƌĞdžĂŵƉůĞƚŚĞƐŝnjĞŽĨďŽŝůĞƌĂŶĚƌĂĚŝĂƚŽƌƐ
EĞŝƚŚĞƌĚŽĞƐƚŚĞƐĞƫŶŐĂīĞĐƚŚŽǁƋƵŝĐŬůLJƚŚĞƌŽŽŵĐŽŽůƐĚŽǁŶ
dƵƌŶŝŶŐĂƌŽŽŵƚŚĞƌŵŽƐƚĂƚƚŽĂůŽǁĞƌƐĞƫŶŐǁŝůůƌĞƐƵůƚŝŶƚŚĞƌŽŽŵďĞŝŶŐĐŽŶƚƌŽůůĞĚĂƚ
a lower temperature, and saves energy.
dŚĞŚĞĂƟŶŐƐLJƐƚĞŵǁŝůůŶŽƚǁŽƌŬŝĨĂƟŵĞƐǁŝƚĐŚŽƌƉƌŽŐƌĂŵŵĞƌŚĂƐƐǁŝƚĐŚĞĚŝƚŽīdŚĞ
ǁĂLJƚŽƐĞƚĂŶĚƵƐĞLJŽƵƌƌŽŽŵƚŚĞƌŵŽƐƚĂƚŝƐƚŽĮŶĚƚŚĞůŽǁĞƐƚƚĞŵƉĞƌĂƚƵƌĞƐĞƫŶŐƚŚĂƚ
LJŽƵĂƌĞĐŽŵĨŽƌƚĂďůĞǁŝƚŚĂŶĚƚŚĞŶůĞĂǀĞŝƚĂůŽŶĞƚŽĚŽŝƚƐũŽďdŚĞďĞƐƚǁĂLJƚŽĚŽƚŚŝƐ
is to set the room thermostat to a low temperature – say 18ºC – and then turn it up by
ŽŶĞĚĞŐƌĞĞĞĂĐŚĚĂLJƵŶƟůLJŽƵĂƌĞĐŽŵĨŽƌƚĂďůĞǁŝƚŚƚŚĞƚĞŵƉĞƌĂƚƵƌĞzŽƵǁŽŶƚŚĂǀĞ
ƚŽĂĚũƵƐƚƚŚĞƚŚĞƌŵŽƐƚĂƚĨƵƌƚŚĞƌŶLJĂĚũƵƐƚŵĞŶƚĂďŽǀĞƚŚŝƐƐĞƫŶŐǁŝůůǁĂƐƚĞĞŶĞƌŐLJ
and cost you more money.
/ĨLJŽƵƌŚĞĂƟŶŐ ƐLJƐƚĞŵ ŝƐ Ă ďŽŝůĞƌ ǁŝƚŚ ƌĂĚŝĂƚŽƌƐƚŚĞƌĞ ǁŝůů ƵƐƵĂůůLJďĞŽŶůLJŽŶĞƌŽŽŵ
ƚŚĞƌŵŽƐƚĂƚƚŽĐŽŶƚƌŽůƚŚĞǁŚŽůĞŚŽƵƐĞƵƚLJŽƵĐĂŶŚĂǀĞĚŝīĞƌĞŶƚƚĞŵƉĞƌĂƚƵƌĞƐŝŶŝŶĚŝ-
ǀŝĚƵĂůƌŽŽŵƐďLJŝŶƐƚĂůůŝŶŐƚŚĞƌŵŽƐƚĂƟĐƌĂĚŝĂƚŽƌǀĂůǀĞƐ;dZsƐͿŽŶŝŶĚŝǀŝĚƵĂůƌĂĚŝĂƚŽƌƐ/Ĩ
you don’t have TRVs, you should choose a temperature that is reasonable for the whole
ŚŽƵƐĞ/ĨLJŽƵĚŽŚĂǀĞdZsƐLJŽƵĐĂŶĐŚŽŽƐĞĂƐůŝŐŚƚůLJŚŝŐŚĞƌƐĞƫŶŐƚŽŵĂŬĞƐƵƌĞƚŚĂƚ
ĞǀĞŶƚŚĞĐŽůĚĞƐƚƌŽŽŵŝƐĐŽŵĨŽƌƚĂďůĞƚŚĞŶƉƌĞǀĞŶƚĂŶLJŽǀĞƌŚĞĂƟŶŐŝŶŽƚŚĞƌƌŽŽŵƐďLJ
ĂĚũƵƐƟŶŐƚŚĞdZsƐ
ZŽŽŵƚŚĞƌŵŽƐƚĂƚƐŶĞĞĚĂĨƌĞĞŇŽǁŽĨĂŝƌƚŽƐĞŶƐĞƚŚĞƚĞŵƉĞƌĂƚƵƌĞƐŽƚŚĞLJŵƵƐƚŶŽƚ
ďĞĐŽǀĞƌĞĚďLJĐƵƌƚĂŝŶƐŽƌďůŽĐŬĞĚďLJĨƵƌŶŝƚƵƌĞEĞĂƌďLJĞůĞĐƚƌŝĐĮƌĞƐƚĞůĞǀŝƐŝŽŶƐǁĂůůŽƌ
table lamps may prevent the thermostat from working properly.
WHAT IS A ROOM THERMOSTAT
pancy period. ;dŚŝƐŚĞůƉƐLJŽƵƚŽƐĂǀĞŵŽŶĞLJŽŶLJŽƵƌŚĞĂƟŶŐďŝůůƐͿ.
Ͳ dŽĐŚĂŶŐĞƚŚĞŽƉƟŵŝƐĂƟŽŶƚLJƉĞƌĞĨĞƌƚŽƚŚĞŝŶƐƚĂůůĂƟŽŶŝŶƐƚƌƵĐƟŽŶƐ
/ĨƚŚĞƉƌŽďůĞŵƉĞƌƐŝƐƚƐƚŚĞŶĐŽŶƚĂĐƚLJŽƵƌŝŶƐƚĂůůĞƌ
If either Service due soon or Service due appear in the display then contact your in-
staller or land lord.