A.O. Smith 310 - Page 30

TroubleshootingGuide
30|Page
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5) FAN
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a. Thefanisheldinbytwoscrews.Theyfacethebottomof
theheater,andcanbereachedbytwoholesinthebottom
ofthecasewithalongscrewdriver.
b. Slideitlefttoreleaseitfromthegrooves.
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6) WATERWAYS
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a. Iftheunithasnotbeendrainedatthispoint,nowisthe
timetodoso.RefertotheDrainingtheUnitprocedurein
thetroubleshootingproceduressection.
b. Disconnectthewaterwayclipspicturedattheright.
c. Placeadry towelinthebottomoftheunit
casewhen
dislodgingthepipesfromtheirsockets.
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7) REMOVETHEHEATEXCHANGER
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a. Removethetwoscrewsatthetopoftheheatexchanger.
b. Theheatexchangershouldbefreetoberemoved.If
thereareanymissedwiresstillconnectedtotheheat
exchangerassembly,removethemsotheheatexchanger
iscompletelyfree.
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8) REPLACETHEHEATEXCHANGERCOMPONENTS
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a. Removeandinspectthenewheatexchangermakingsure
itisdesignedforthecorrectmodelandisnot
damagedatall.
b. Installthefollowingitemsfromtheold
exchangerontothenewone:
i. OverheatCutoffFuse
ii. Freezeprotectionblocks
iii. Plasticpressureport
iv. Hi‐
Limitswitch
v. Hotwaterthermistor
vi. SiliconVentGasket
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9) REASSEMBLE
‐Reassembletheunitinreverseorder.Keypointstoremember:
a. Allwiresmustbereconnected.K eepwiresdanglingoutinfrontoftheunit,neverpushthem
towardthebackwheretheyarenotvisible;youwillforgetaboutthem.
b. Inspectallofthegaskets.
c. Beaware
ofthevariousO‐ringsonthegasandwatervalves,alongwiththewaterwayclips.
d. Reattachallextracomponentsthatthemanifoldscrewssecureintheirplaces. 
e. Donothaveanyscrewsleftover.
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Figure31
Figure32
Figure33