Glowworm 12hxi User manual

Instructions for Use
Condensing Boilers/
Ultracom hxi
12hxi G.C. No. 41-019-01
15hxi G.C. No. 41-019-02
18hxi G.C. No. 41-019-03
24hxi G.C. No. 41-019-04
30hxi G.C. No. 41-019-05
38hxi G.C. No. 41-019-06

READ CAREFULLY BEFORE USING
1 Readme.................................................................................................................. 4
1.1 Welcome........................................................................................... 4
1.2 GuaranteePack................................................................................ 4
1.3 Servicing........................................................................................... 4
1.4 Benchmark....................................................................................... 5
1.5 QuickReferenceGuide.................................................................... 5
2 Introducingyourappliance...................................................................................... 6
2.1 Appliancedescription....................................................................... 6
2.2 Accessories...................................................................................... 6
3 Productdocumentation........................................................................................... 6
3.1 Documentstorage............................................................................ 6
3.2 Explanationofsymbols..................................................................... 6
4 Safety...................................................................................................................... 7
4.1 Whattodoifyousmellgas............................................................. 7
4.2 Safetyrecommendations.................................................................. 7
4.3 Safetyregulations............................................................................. 8
5 GuaranteeResponsibility........................................................................................ 9
5.1 DetailedGuarantee.......................................................................... 9
5.2 ApplianceUse/Manufacturerresponsibility.................................... 9
6 Recycling............................................................................................................... 10
6.1 Appliance........................................................................................ 10
6.2 Packaging....................................................................................... 10
7 Clearances............................................................................................................ 10
HOW TO USE YOUR APPLIANCE
8 Overview................................................................................................................11
8.1 DisplayDescription..........................................................................11
8.2 SwitchingOnandOff...................................................................... 12
8.3 UserControls.................................................................................. 13
8.4 Settingthe24hourclock................................................................ 14
8.5 Settingtheinbuiltprogrammer....................................................... 15
8.6 Advancingthetimedcentralheatingprogrammer.......................... 16
8.7 Advancingthedomestichotwaterprogrammer............................. 16
table of contents
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ANY ASSISTANCE?
9 FaultFinding......................................................................................................... 16
9.1 Electricalcircuitinterruption............................................................ 16
9.2 Appliancefailstolight..................................................................... 17
10 ApplianceSafetyDevices..................................................................................... 17
10.1 BoilerShutdown............................................................................. 17
10.2 ProtectingAgainstFrost................................................................. 17
10.3 CondensateDrainBlockage........................................................... 18
10.4 SafetyDischargeValve.................................................................. 18
11 ApplianceMaintenanceandServicing.................................................................. 18
11.1 Cleaning......................................................................................... 18
11.2 RegularServicing........................................................................... 18
11.3 SealedWaterSystems................................................................... 19
11.4 SpareParts..................................................................................... 19
12 TipsforSavingEnergy.......................................................................................... 19
13 Contactyourafter-salesorganisation................................................................... 19
table of contents
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READ CAREFULLY BEFORE USING
1 Read me
1.1 Welcome
Theseinstructionsareanintegralpart
oftheboilerandmust,tocomplywith
thecurrentissueoftheGasSafety
(InstallationandUse)Regulations,beleft
withtheuser.
Ensurethattheinstallerhasfully
completedtheBenchmarkChecklist
locatedontheinsidebackpagesofthe
installationinstructionssuppliedwith
theproductandthatyouhavesignedit
tosaythatyouhavereceivedafulland
clearexplanationofitsoperation.The
installerislegallyrequiredtocompletea
commissioningchecklistasameansof
complyingwiththeappropriateBuilding
Regulations(EnglandandWales).
AllinstallationsmustbenotiedtoLocal
AreaBuildingControleitherdirectlyor
throughaCompetentPersonsScheme.
ABuildingRegulationsCompliance
Certicatewillthenbeissuedtothe
customerwhoshould,onreceipt,writethe
NoticationNumberontheBenchmark
Checklist.
Readtheseinstructionsandfollowthem
carefullyforthesafeandeconomicaluse
ofyourboiler.
Do not forget to read the
chapters “Safety” and
“Guarantee” where you will nd
important information for your
safety.
1.2 Guarantee Pack
Thepackcontainstheletterofintroduction
andtheguarantee.Theextended
guaranteeissuppliedlooseandwe
recommendthatyoushouldreadit.
Completeandreturnassoonaspossible
yourguaranteeregistrationcard.
Ifyourguaranteeregistrationcardis
missingyoucanobtainacopyorrecord
yourregistrationbytelephoning
theGlow-wormCustomerServicenumber
08000732142.
1.3 Servicing
Thisproductshouldbeservicedregularly
tooptimiseitssafety,efciencyand
performance.Theserviceengineershould
completetherelevantServiceRecord
ontheBenchmarkChecklistaftereach
service.TheBenchmarkChecklistmay
berequiredintheeventofanywarranty
workandassupportingdocumentation
relatingtohomeimprovementsinthe
optionaldocumentssectionoftheHome
InformationPack.
Toensurethecontinuedefcientandsafe
operationoftheboileritisrecommended
thatitischeckedandservicedatregular
intervals.Thefrequencyofservicingwill
dependuponthesiteconditionsand
usage,butingeneral,onceayearshould
beenough.
Toobtainservice,callyourinstalleror
Glow-worm’sownserviceorganisation
usingthetelephonenumberontheinside
frontcoverofthisbooklet.

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1.4 Benchmark
Glow-wormisalicensedmemberof
theBenchmarkSchemewhichaimsto
improvethestandardsofinstallation
andcommissioningofdomesticheating
andhotwatersystemsintheUKandto
encourageregularservicingtooptimise
safety,efciencyandperformance.
1.5 Quick reference guide
WedesignedthisQuickreferenceguide
sothatyoucanstartusingyourappliance
rightaway.
ThisQuickreferenceguideassumesthat
theappliancehasbeeninstalledand
commissionedbyacompetentperson.
Benchmarkismanagedandpromoted
bytheHeatingandHotwaterIndustry
Council.
• Formoreinformationvisit
www.centralheating.co.uk

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2 Introducing your appliance
2.1 Appliance description
TheUltracomhxirangeofboilersare
designedtoprovidecentralheatingfroma
fullypumpedopenventedorsealedwater
systemanddomestichotwaterusinga
fullyindirectcylinder.
Oncethecontrolsareset,theboiler
operatesautomatically.
Intelligentcontrolsareavailableas
accessoriesfromGlow-worm.
ContactyourInstallerorGlow-wormsales
forfurtherinformation.
TheUltracomhxiboilerisanappliance
thatusescondensingtechnology,which
recoversheatfromtheuegases,this
operatingprinciple,consumeslessenergy
andcontributestothereductionofyour
householdCO2emissions.
Thisapplianceisaroom-sealedtype
equippedwithauesystemforairsupply
andtheremovalofcombustionproducts.
Thisuesystemoffersthepossibilityto
installtheapplianceinanyroomwithout
theneedforadditionalventilation.
Installationandcommissioningofthe
applianceshouldonlybecarriedoutbya
competentperson.Theyareresponsible
fortheinstallationandthecommissioning
inaccordancewithstandardsinforce.
Youshouldalsoconsultacompetent
personformaintenanceandrepairofthe
applianceaswellasforanyadjustment
necessary.
2.2 Accessories
TheUltracomhxiiscompatiblewithmost
makesof230Vprogrammableroom
thermostats.
Forincreasedsystemcompatibilityand
increasedenergysavingwithintelligent
controlGlow-wormofferarangeof
controlsdedicatedtoworkusingaunique
communicationsystem-eBus(low
voltage).
Forfurtherdetailscontactyourinstaller.
3 Product documentation
3.1 Document storage
• Makesurethatthismanualisstored
closetoyourapplianceforfuture
reference.Shouldyoumovehome
ensurethatthismanualishandedover
tothenewhomeowners.
• Readtheseinstructionsandfollow
themcarefullyforthesafeandefcient
useofyourappliance.
Noresponsibilityorliabilitycanbe
acceptedfordamagescausedbyfailureto
followtheinstructionsinthismanual.
3.2 Explanation of symbols
DANGER: Risk of injuries.
ATTENTION: Risk of damage
to the appliance or to its
surroundings.
IMPORTANT INFORMATION

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4 Safety
4.1 What to do if you smell gas?
- isolateyourgassupplyatthegas
emergencycontrolvalve.
- Eliminateallsourcesofignition,i.e.
smoking,blowlamps,hotairgunsetc.
- donotoperateelectricallightsor
switches,eitheronoroff.Openall
doorsandwindows,ventilatethearea.
- openimmediatelywindowsanddoors
inordertoventilatetheproperty.
- donotsearchforgasleakswitha
nakedame.
- callyourgassupplier’semergency
phonenumber.
- alertotherbuildingoccupants.
4.2 Safety recommendations
Youmustcomplywiththefollowing
recommendationsandsafetyinstructions:
• Neverperformanymaintenanceor
repairoftheapplianceyourself.
Onlycompetentpersonsareallowedto
workontheappliance.
• Nevertamperwithsafetydevices.
• Donotattempttomodifytheappliance
oritsimmediatesurroundingsasthis
mayaffectonthesafeuseofthe
appliance.
• Undernocircumstancesmusttheuser
interferewithoradjustsealedparts.
• Donotallowchildrentooperatethe
appliance.
• Donotobstructtheuesystem
Certainhomeimprovementsmay
adverselyaffecttheoperationofyour
appliance–youshouldconsultyour
installerforadvicebeforecarryingoutany
work.
• Donotexposetheappliancetohigh
humidity.
• Donotuseorstoreexplosiveor
inammablematerials(e.g.petrol,
aerosols,solvents,chlorinebased
detergents,paint,glueetc.)inthesame
roomastheappliance.Undercertain
conditions,thesesubstancescanprove
tobecorrosive.
• Donottouchtheheatedsurfacesof
theappliance,suchasoutletduct,
hydraulicconnections,alsoafterthe
applianceoperationbecause,for
acertaintime,thesesurfacesmay
becomehot.Anycontactwiththemcan
causeburns.
Thisappliancecontainsmetalparts
(components)andcareshouldbe
takenwhenhandlingandcleaning,with
particularregardtoedges.
• Inthecaseofanywaterleak,
immediatelyturnoffthecoldwater
supplytotheapplianceandhave
theleakrepairedbyyourcompetent
person.
• Donotstoreorplacearticlesonthe
appliance.

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4.3 Safety regulations
Servicing/maintenanceshouldbecarried
outbyacompetent personapproved
atthetimebytheHealthandSafety
Executive,inaccordancewiththerulesin
forceinthecountriesofdestination.
Ifthisboilerisinstalledinarentedproperty
intheUKthereisadutyofcareimposed
ontheownerofthepropertybythecurrent
issueoftheGasSafety(Installationand
Use)Regulations,Section35.
Gas Safety (Installation and Use)
Regulations
Inyourowninterestsandthatofsafety,it
istheLawthatALLgasapplianceshave
beeninstalledbyacompetentperson
approvedatthetimebytheHealthand
SafetyExecutive,inaccordancewiththe
currentissueoftheseregulations.
Gas Category
ThisboilerisforuseonlyonG20natural
gasbutcanbeconvertedforuseonG31
propane.
Electrical Connection
TheboilerMUSTbeearthed.
TheboilerMUSTbeconnectedtoa
permanent230Vac,50Hzsupply,fused
at3A.
Connectionofthewholeelectricalsystem
oftheboiler,includinganyheating
controls,totheelectricalsupplymustbe
throughonecommonisolator.
Thecoloursofthreecoreexiblecable
are,blue-neutral,brown-live,greenand
yellow-earth.
Testing and Certication
Thisboileriscerticatedtothecurrent
issueofEN483forperformanceand
safety.
Itisimportantthatnoalterationismadeto
theboilerunlessapproved,inwriting,by
Glow-worm.
Anyalterationnotapprovedby
Glow-worm,couldinvalidatethe
certication,boilerwarrantyandmayalso
infringethecurrentissueofthestatutory
requirements.
CE Mark
Thisboilermeetstherequirements
ofStatutoryInstrument,No.3083of
theBoiler(EfciencyRegulations,
andthereforeisdeemedtomeetthe
requirementsofDirective92/42/EEC
ontheefciencyrequirementsfornew
hotwaterboilersrewithliquidorgaseous
fuels.
TypetestforpurposesofRegulation5
certiedby:Notiedbody0087.
Product/productioncertiedby:Notied
body0086.
TheCEmarkonthisapplianceshows
compliancewith:
-Directive90/396/EEConthe
approximationofthelawsoftheMember
Statesrelatingtoappliancesburning
gaseousfuels.
-Directive73/23/EEConthe
harmonisationoftheLawsoftheMember
Statesrelatingtoelectricalequipment
designedforusewithincertainvoltage
limits
-Directive89/336/EEConthe
approximationoftheLawsoftheMember
Statesrelatingtoelectromagnetic
compatibility.

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The CE mark shows that this
appliance has been designed
according to the safety
techniques and rules in force.
The compliance of this
appliance with the relevant
standards has been certied.
5 Guarantee / Responsibility
5.1 Detailed guarantee
ThankyouforinstallinganewGlow-worm
applianceinyourhome.
Glow-wormappliancesaremanufactured
totheveryhigheststandardsowe
arepleasedtoofferourcustomersa
ComprehensiveGuarantee.
Thisproductisguaranteedfor24months
fromthedateofinstallationor30months
fromthedateofmanufacture,whicheveris
theshorter,forpartsandlabour.
Thesecondyearofthepartsguarantee,
fromthebeginningofthe13thmonth
onwardsafterinstallationormanufacture,
isconditionalupontheboilerhaving
beenservicedbyacompetentperson
approvedatthetimebytheHealthand
SafetyExecutive,inaccordancewiththe
manufacturer’srecommendations.We
stronglyrecommendregularservicing
ofyourgasappliance,butwherethe
conditionisnotmet,anychargeablespare
partsorcomponentsissuedwithinthe
applicableguaranteeperiodstillbenet
froma12monthwarrantyfromthedateof
issuebythemanufacturer.
5.2 Appliance use / manufacturer
responsibility
Servicing/maintenanceshouldbecarried
outbyacompetentperson approved
atthetimebytheHealthandSafety
Executive,inaccordancewiththerulesin
forceinthecountriesofdestination.
Theguaranteeisapplicableonthe
conditionthat:
- Theapplianceisinstalledbya
competentpersoninaccordancewith
installationinstructions.
- Theapplianceisusedfornormal
domesticpurposesandinaccordance
withthemanufacturer’soperatingand
maintenanceinstructions.
- Theapplianceisserviced,maintained,
byacompetentperson.
- Therepairorreplacementofparts
duringtheguaranteeperioddoesnot
havetheeffectofextendingtheperiod.
Themanufacturerhasnoresponsibility
whatsoeverforanydamageresulting
from:
- Anydefectsordamageresulting
fromincorrectorpoorinstallation,
inadequateservicing,ormaladjustment
ofthegasorwaterused.
- Anydefectsinthesystemtowhichthe
applianceisconnected.
- Anydefectscausedbyinadequatefrost
protection.
- Anydeteriorationormaladjustment
followingchangesinthenatureor
pressureofthegasorthewaterused,
orachangeinthecharacteristicsofthe
electricalsupplyvoltage.
• Forfurtherdetails,refertoyourTerms
andConditions.

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This appliance is intended
to be installed only within
the designated countries
displayed on the type plate.
• Itistheresponsibilityofparents,
guardiansandcarers,thatthe
applianceisprotectedawayfrom
personsundertheircare.
6 Recycling
Thisappliancecontainsmanyrecyclable
partsandshouldbedisposedofaccording
tothecurrentWEEEregulations.The
packagingshouldalsobedisposedof
accordingtothecurrentregulations.
6.1 Appliance
Theappliancemustberecycledin
compliancewiththeWEEE(Waste
ElectricalandElectricalEquipment)
directivewhich,inparticular,requires:
- selectivecollectionofwasteelectrical
andelectronicequipment,
- thesystematicselectiveprocessingof
certaincomponentsandsubstances
deemeddangerous,
- reuse,recyclingandenergyrecoveryof
collectedWEEE’s.
This symbol indicates that
this appliance must not be
disposed of with household
waste, that it should be
selectively collected for
energy recovery, reuse or
recycling.
• Taketheappliancetoanappropriate
collectionpointforprocessing,energy
recoveryandrecyclingofwaste
ElectronicandElectricalEquipment.
By complying with this
directive, you will contribute
to the preservation of natural
resources and the protection of
human health.
6.2 Packaging
Thecompetentpersonwhoinstalledthe
appliancemust:
- sortthewastesoastoseparatethose
whichcanberecycled(cardboard,
plastics...)fromthosethatcannot.
- disposeofthewasteincompliancewith
regulationsinforce.
7 Clearances

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HOW TO USE YOUR APPLIANCE
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MODE
PROG
Ext
Ext
SYMBOLS DISPLAYED ON THE LCD AND DESCRIPTIONS
Max burner display
Glow-worm external control (Optional)
Min burner display
Temperature
Appliance OFF
Central Heating
Timed Mode
Programmer Adjustment Mode
Domestic Hot Water Function
Central Heating Function
Ext
LCD
DISPLAY
RESET
BUTTON
DHW CH
TEMPERATURE
ADJUSTMENT
TOGGLE BUTTON
MODE and PROG
HOW TO USE YOUR APPLIANCE
8 Overview
8.1 Display Description
TheUserControlpanelconsistsofthree
togglebuttons,aresetbuttonanddisplay,
whichwillindicatewithsymbolsthestatus
oftheboiler

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8.2 Switching On and Off
Switching on
• Removethecoverplate.
If you are in any doubt about
the boiler being lled with
water contact your installer
or Glow-worm's own service
organisation using the
telephone number shown in
the chapter " Contact your
after-sales organisation".
• Selectyourrequiredfunction 
press"MODE"repeatedlyto 
scrollthroughyouroptionsand 
selectoneofthefollowing:-
• Centralheating. 
• BoilerfunctionsALLswitchedoff.
• TurnONyourexternalcontrolsand
selecttheroomtemperaturerequired.
• Theboilerwilloperateautomatically.
• NOTE:Thedisplaywillindicatethe
Heatingsystemwatertemperatureora
faultcode(seesectionFaultFinding).
• Thecontrolpanelwillashanddisplay
allitsdigits.Itwillthenreturntothe
defaultdisplayanddependingonthe
selectedoperationandcontrols,display
thetemperaturesettings.
Switching off
• press"MODE"repeatedlyto 
scrollthroughyouroptionsand 
select .
Alltheappliancefunctionswillbeswitched
off,exceptfrostprotection.
GAS SERVICE
ISOLATION
VALVE
(shown open)
COVER PLATE
- Checkthatthegasserviceisolation
valveontheapplianceisopen.
Do not operate the boiler
without water.
• Makesurethat:
- Theappliancehaselectricalpower,
- Thegasserviceisolationvalveisopen.

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If you intend to leave
your property empty for a
prolonged period, refer to
the Appliance Safety Devices
section.
OFF
STEP 1
STEP 2
Press the "+ or -" once
the current temperature
will be displayed "flashing".
Press "+ or -" to
increase or decrease the temperature.
The temperature setting will
automatically save after 5 seconds.
8.3 User Controls
Central Heating
Thetemperatureisfactorypresettothe
minimum38°C,butcanbeadjustedto
amaximumof82°Casrequired,referto
steps1and2.

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STEP 1
STEP 2
MODE
PROG
MODE
PROG
STEP 3
Press and hold "PROG" 5 secs.
the "hours" symbol will flash.
Press "PROG" to confirm.
The process will automatically scroll to minutes,
then days, set as previously described.
Press the "+" or the "-"
to set the hour.
8.4 Setting the 24 hour Clock
Tosettheclock,followsteps1to3.

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HOW TO USE YOUR APPLIANCE
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8.5 Setting the inbuilt programmer
Toalterthetimestosuityour
requirements,follow"Steps"1to4.
MODE
PROG
Flashing cursor.
Press + or - to move the flashing
cursor to the desired time.
Press "+" to add a time segment
or "-" to remove a time segment.
STEP 1 STEP 2
"Running Time"
Indicated by solid squares.
Square represents 30 minutes.
STEP 3
Press the "PROG" button once to view Mondays
factory default central heating running times.
STEP 4 - COPY FUNCTION.
When validating the timed
intervals you can hold the
"PROG" button for 5 seconds
and the times will be duplicated
onto the next day, hold the button
continually and the times will be
copied to all days.
Press "PROG" to validate the time intervals.
The days will automatically change, repeat the process or refer to
the "Copy Function".
After the 7th. day the "Domestic Hot Water" time intervals will be
displayed, follow the same process steps 1 to 4.
STEP 4
Press "PROG" to validate the time intervals.
The days will automatically change, repeat the process
or refer to the "Copy Function".
After the 7th. day the process will exit to show the
boiler status.
STEP 4
The inbuilt programmer for
Central Heating and Domestic
Hot Water, can only be used
if Glow-worm controls are
installed.

Timed Central Heating
Factorypresettimedintervalsare:-
MondaytoFriday-ON6.00-OFF8.00.
ON16.00-OFF23.00.
Saturday&Sunday-ON8.00OFF23.00.
Timed Domestic Hot Water 
Factorypresettimesforpreheatare:-
MondaytoSunday-ON6.00-OFF24.00.

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HOW TO USE YOUR APPLIANCE
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Press + and hold for 5 seconds
your appliance will operate until
the next OFF period, or you can
cancel by pressing + for 5 seconds.
Press + and hold for 5 seconds
your appliance will operate until
the next OFF period, or you can
cancel by pressing + for 5 seconds.
8.6 Advancing the timed central
heating programmer ON /OFF
times
Thisfunctionwillonlyworkwhenthe
applianceisintimedoperatingmode,
"Clocksymbol".
Refertodisplaydescriptioninsection8.1.
Theactivated/deactivatedsegmentswill
ashfor5seconds.
Themainscreenisthendisplayedagain.
There is no visual indication
that this feature has been
activated once the segments
have stopped ashing.

ANY ASSISTANCE?
9 Fault Finding
9.1 Electrical circuit interruption
Theboilerwillnotworkwithoutan
Advanced functions only
available if the in-built
programmer is enabled.
8.7 Advancing the Domestic Hot
Water programmer ON /OFF times
Thisfunctionwillonlyworkwhen
theapplianceisintimedoperating
mode,"Clocksymbol".
Refertodisplaydescriptioninsection8.1.
electricalsupplyandnormaloperation
oftheboilershouldresumewhenthe
electricalsupplyisrestored.
Iftheboilerdoesnotresumenormal
operation,checktheexternalcontrols.
Itmaybenecessarytorestartyour
appliance.
• Torestarttheboiler,pressthereset
button,seechapter"Howtouseyour
appliance►Overview".

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ANY ASSISTANCE ?
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9.2 Appliance fails to light
TheLCDwilldisplayaashing'F'and
codenumber,
• Torestarttheboiler,pressthereset
button,seechapter"Howtouseyour
appliance►Overview".
Ifanyfaultpersists,andyourappliancestill
does not work, leave it switched off and
contactyourcompetentperson.
Like all condensing boilers
it will produce a plume of
condensation from the ue
terminal in cool weather.
This is due to the high
efciency and hence low ue
gas temperature of the boiler.
It is normal and not a fault
indication.
10 Appliance safety devices
10.1 Boiler Shutdown
Theboilersoftwareisdesignedto
recognisethepotentialforanoverheat
lockoutandwillshutdownbeforethis
happens.
• Torestarttheboiler,pressthereset
button,seechapter"Howtouseyour
appliance►Overview".
CODE DESCRIPTION POSSIBLECAUSES
F1 Boilerhasattemptedto
light5timesandfailedon
alloccassions
Presstheresetbutton.
Ifthefaultpersists,contactyourInstallation/Servicing
companyorGlow-worm
F5 Overheat Boilerhasoverheated-allowtocoolthenpressresetbutton
Iftheboilerfailstoresumenormal
operationandallexternalcontrolsare
callingforheat,thencallyourInstallation/
ServicingcompanyorGlow-wormservice.
10.2 Protecting against frost
Appliance Protecion
Incaseoftheriskoffrost:
• Makesurethattheelectricalandgas
supplytotheapplianceisturnedon.
• Foranabsenceofseveraldays,you
canleavetheappliancetorunnormally.
Theappliancehasabuiltinfrost
protectiondevicethatprotectstheboiler
fromfreezing.Withthegasandelectric
suppliesONandirrespectiveofanyroom
thermostatsetting,thefrostprotection
devicewilloperatethepumpwhenthe
temperatureoftheboilerwaterfalls
below8OC.Atimerisusedsothatthe
temperaturecanbecheckedperiodically.
After10minutesthepumpwillbestopped
ifthetemperatureishigherthan10OCor
hasalreadyreached35OC.Theburner
willactivateiftheboilertemperature
doesnotreach10OCafter30minutesor
atanytimeifthetemperaturedropsto
5OC.Theburnerwillswitchoffwhenthe
temperaturereaches35OC.
Theappliancealwayshasfrostprotection
activewhenthepowerandgassupplyare
on.

0020127403 - 01/11 - Glow-worm
ANY ASSISTANCE ?
- 18 -
System Protection
Theboileralonecannotensurethatthe
installationisprotectedagainstfrost.
NOTE:Anyotherexposedareasofthe
systemshouldbeprotectedbyaseparate
frostthermostat.
Incaseofprolongedabsence,where
powertothedwellingandtheboileris
switchedoff,contactyourInstallation/
ServicingcompanyorGlow-wormService
tohavetheinstallationdrainedortohave
theheatingcircuitprotectedbyaddingan
anti-freezespeciallydesignedforheating
systems.
CAUTION: Your domestic
water circuit (hot and cold) is
not protected by the boiler.
10.3 Condensate Drain Blockage
Asasafetyfeaturetheboilerwillstop
workingifthecondensatedrainbecomes
blocked.Duringfreezingconditionsthis
maybeduetotheformingoficeinthe
condensedrainexternaltothehouse.
• Releaseaniceblockagebytheuseof
warmclothsonthepipe.
Theboilershouldthenrestart.
• ContactyourInstallation/Servicing
companyorGlow-wormserviceifthe
faultpersists.
10.4 Safety Discharge Valve
Thesafetydischargevalveanddischarge
pipeisttedtotheboiler.
• Ifthereisanydischargefromthepipe,
switchofftheboilerelectricalsupply,
thencallyourInstallation/Servicing
companyorGlow-wormservice.
11 Appliance maintenance and
servicing
11.1 Cleaning
Before cleaning turn the
appliance off.
Theappliancecasingcanbecleaned
usingamildliquiddetergentwithadamp
cloth,thenadryclothtopolish.
Do not use any form of
abrasive or solvent cleaner
as you may damage the
paintwork.
11.2 Regular servicing
Regularservicingoftheapplianceis
importanttotheprolonged,safeand
efcientuseofyourappliance.
Incorrect or inadequate
servicing can severely affect
the safety of the appliance
and can lead to injury.
Werecommendthatyourapplianceis
servicedeveryyear.
• Onlyuseacompetentperson.
Theserviceengineershouldcomplete
therelevantServiceRecordonthe
BenchmarkChecklistaftereachservice.
TheBenchmarkChecklistmaybe
requiredintheeventofanywarranty
workandassupportingdocumentation
relatingtohomeimprovementsinthe
optionaldocumentssectionoftheHome
InformationPack.

0020127403 - 01/11 - Glow-worm
ANY ASSISTANCE ?
- 19 -
Toobtainservice,callyourinstalleror
Glow-worm’sownserviceorganisation
usingthetelephonenumberontheinside
frontcoverofthisbooklet.
11.3 Sealed Water Systems
Thedraining,rellingandpressurising
MUSTbecarriedoutbyacompetent
personapprovedatthetimebytheHealth
andSafetyExecutive.
• ContactGlow-worm’sownservice
organisationusingthetelephone
numberbelow.
Tel:01773828100
11.4 Spare Parts
Inordertoguaranteethesafeand
prolongedlifeoftheproduct,insistthat
onlythemanufacturer’sgenuinespare
partsareused.
• Donotusereconditionedorcopyparts
thathavenotbeenclearlyauthorised
byGlow-worm.
• Ifreplacementpartsarerequired
contactGlow-worm’sownservice
organisationforadviceusingthe
telephonenumberbelow.
Tel:01773828100
orforapprovedstockist,visitwww.glow-
worm.co.uk.
Quotethenameandmodeloftheboiler.
Thenameandmodelbadgeisonthefront
case.
• Ifindoubtseekadvicefromthe
localgascompanyorGlow-worm’s
ownserviceorganisationusingthe
telephonenumberbelow.
Tel:01773828100
12 Tips for saving energy
Yourinstallerwillbeabletogiveenergy
savingadviceaboutyoursystemandits
controls.
Forenergysavingadviceyoucancontact
theEnergySavingsTrustforadviceor
visitwww.energysavingtrust.org.ukwho
offersimpleeffectiveadviceaboutsaving
energy.
Regularservicingofyourboilerwillhelp
maintainitsefciency-servicingoncea
yearisrecommended
Turnyourthermostatdown.Reducing
yourroomtemperatureby1°Ccouldcut
yourheatingbillsbyupto10percent.Set
yourheatingandhotwateratthetime
controllertocomeononlywhenrequired
ratherthanallthetime.
13 Contact your after-sales
organisation
Customer service call
Tel:01773828100
Technical helpline
Tel:01773828300

GloW-WoRM
Nottingham Road,
Belper, Derbyshire.
DE56 1JT
Because of our constant endeavour for
improvement, details may vary slightly
from those shown in these instructions.
www.glow-worm.co.uk
Subject to engineering changes
BARCODE
0020127403 - 01/11
0020127403