ProSelect Force Steam Gas Boiler Installation Manual
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Thefollowingpagescontaintroubleshootingchartsforuseindiagnosingcontrolproblems.Tousethesecharts,gotothe
boxmarked“Start”atthetopofthechartonpage30or32andfollowtheappropriatepaththoughthechartuntilaboxwith
alistofpossiblecausesisreached.Iftheproblemisknowntobewithintheignitionsystem,godirectlytotheignitionsystem
troubleshootingguidefortheboileronpage32.Inusingthesecharts,thefollowingshouldbekeptinmind:
1) Thesechartsareonlymeanttobeusedbyaprofessionalheatingtechnicianasanaidindiagnosingcontrolproblems.
2) Whereapplicable,followallprecautionsoutlinedintheOperatingInstructions.SeeFigure14.
3) Ingeneral,thesechartsassumethattherearenolooseormiswiredelectricalconnections.Beforeusingthesecharts,
inspectallelectricalconnectionsontheboilertomakesurethattheyaretight.Also,checkthewiringontheboiler
againsttheappropriatewiringdiagraminFigures11and12.
4) Thepossiblecausesattheendofeachbranchinthesechartsarenotlistedinorderoflikelihood.Allcontrolsonthe
FORCESTMaretestedatleastonceinthemanufacturingprocessandadefectivecontrolorcomponentisgenerallythe
leastlikelycause.Beforereplacingacomponent,trytoruleoutallotherpossiblecauses.
5) Thesetroubleshootingchartsassumethattheventdamperisclosedatthebeginningofthetroubleshootingprocess.With
the120voltsappliedtotheboilerandnocallforheat,thedampershouldgototheclosedposition.Ifitdoesnot,dothe
following:
• Conrmthat120voltsisappliedtotheboilerandthatthereisnocallforheat.
• Makesurethattheswitchonthedamperisinthe“automatic”position.
• Unplugtheharnessfromthedamperandcheckfor24voltsacrosspin#1(blue)andpin#4(yellow).
• Ifvoltageispresent,thedamperisdefectiveorthereisanobstructioninthepathofthedamperblade.
• Ifnovoltageispresent,thereiseitheralooseconnectioninthedamperharnessorthetransformerisdefective.
6) Ifthechartsindicatethatthetransformerisdefective,itispossiblethatthistransformerhasbeendestroyedbyashort
circuitintheboilerwiring.Beforereplacingthetransformer,carefullyinspectalllowvoltagewiringontheboilerfor
placeswhereitistouchingtheframeoftheboilerorwiringontheothersideofthetransformer.
7) IfthechartsindicatethattheR8225relayisdefective,thereisagoodchancethatasecondtransformerispresentinthe
thermostatcircuit,resultingintheapplicationof48voltsacrosstherelaycoil.Inolderbuildings,thistransformermaybe
hiddeninalocationfarfromtheboiler.Ifthissecondtransformerexists,itmustbefoundandremovedbeforetheR8225
isreplaced.
8) Whencheckingvoltageacrossdamperharnesspins,becarefulnottoinsertthemeterprobesintothepins.Doingsomay
damagethepin,resultinginalooseconnectionwhentheharnessisreconnected.
XIII. Troubleshooting