
8
9. MAINTENANCE
AllmaintenanceworkshouldbeperformedbyaIII‐Vskill‐categoryelectricianhavingatleastthethirdsafety
engineeringskilllevel.
Maintenanceoperationshouldbeundertakenoncepermonthandforrepairoperation–onceeverysix
months.
Inperformingmaintenanceoperations,followtheseinstructions:
identifythetrouble(s)throughtheassistanceoftheoperatingpersonnel;
makesurethatthetemperaturerelaysensors,limitswitch,lightningaccessoriesandcoveringare
securelyfixed;
makesurethattherearenolooseconnectionsinthecurrent‐carryingpartsoftheelectricrange.
Beforethecontactjoints,retentionpartsofthethermoregulatorsandlightningaccessorieschecking,be
suretodisconnecttheelectricrangebyremovingthefusesorswitchingOFFtheautomaticcircuitbreakeronthe
distributingswitchboard,attachanotice“DonotswitchON.Theunitisundermaintenance”tothehandleofthe
switchingequipment,anddisconnecttherangepowercablesandinsulatethemasrequired.
10. TROUBLESHOOTING
Allproblemsintheelectricrangemalfunctionareresultedintablebelowandshouldberemovedbyduly
qualifiedtechniciansonly.
PROBLEMPOSSIBLECAUSESOLUTION
Electricplatesdonotheatup,the
powersupplycontrollightsburns.
Heatingplatepoorlyheatup.
‐Breakofaneutralwire.
‐Theswitchisdefective.
‐Blowingoftheheatingplates
tubularheatersspirals.
‐Poorwirescontactinswitches.
Toeliminatewirebreakage.
Toreplacetheswitch.
Toreplaceheatingplatestubular
heaters.
Torestorewirecontact.
Controllightsofheatingdonotburn,
heatingplatesheatup.
‐Thecontrollighthaveburntout.
‐Poorcontactinthecontrollights
wires.
Toreplacefusedcontrollight.
Torestorewirecontact.
Theovendoesn’theatup,switches
andthermoregulatorsareswitched
ON,lightsdonotburn.
‐Thereisnopowersupply.
‐Wiresfasteningonentrypostsof
theblockhadloosened.
‐Thermoregulators,thermo
switchesaredefective.
‐Switchesaredefective.
‐Theemergencythermoswitch
wentOFF.
Tosupplyvoltage.
Tofixwiresonentrypostsofthe
blocks.
Toreplacedefectivedetails.
ToswitchONtheemergencythermo
switch.
Theovenheatsuppoorly.‐Oneoftheovenisdefective.
‐Tubularheateraredefective.
Toreplacetheswitch.
Toreplacetubularheaters.
Gappingoftheovendoor.‐Gasketarewornout.Toreplacegasket.
Spontaneousopeningoftheoven
door.
‐Thehingeisbroken.Toopentheovendoorandto
replaceahinge.