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User Manual - Page 6

For MH210KTR.

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6
Mr. Heater, Inc. | Kerosene Forced Air Heater Operating Instructions and Owner’s Manual
ModelMH125KTR, MH175KTR and MH210KTRheatersareequippedwithadiagnosticcontrolboardandflashingLEDerrorindicator.
ThisflashingLEDsignalsindicateunitoperationstatus.Seethefollowingdiagnosticguideforunitstatusandcorrectiveactionifnecessary.
DIAGNOSTIC SAFETY SHUTDOWN AND TROUBLE SHOOTING
LED UNIT OPERATION TROUBLE SHOOTING
SteadyON SystemCheck Systemperformingselftest.Noactionrequired.
SteadyOFF OperationOK Noactionrequired.
2Flashes Noflamedetected Heaterfailstostartduringthefirst30sec.ofoperation.
1. Checkwiringtomotor(perwiringschematicinmanual).
2. Makesurethatthepressuregaugeisinplaceandnotdamaged.
3. Adjustpressureforproperheateroperationpermanual.
4. WithheaterdisconnectedfromACsource,rotatefanclockwisetoverifymotorisfree.
5. Removeairfilterhousingfrommotorandinspectthepumprotorfordamage.Ifdamaged,replacerotorassembly.
6. Ifwiringiscorrect,pumprotorisokay,andmotorisnotrotatingfreely,replacemotororpower-packassembly.
7. Ifproblempersists,replaceoilflamecontrolassembly.
8. Checkforsparkarchingfromtheelectrodeassembly(ref.50),tothecombustioncylinder(ref.39).
9. Checkthecadcell(ref.38)forcontinuity.
3Flashes Highlimitswitch
failure
1. Makesureheateriscooledoff,pressresetswitchandretry.
4Flashes CADCellFailure 1. Checkwiringtocadcell(perwiringschematicinmanual).
2. Cleancadcellphotocell.
• Slidecadcelloutofcadcellholder.
• Pushthephotocelloutoftheblackrubbercadcellhousingbypushingonthe2purplewires.
• Cleanthephotocellwithasoftclothandrubbingalcohol.
• Pullthephotocellbackintothecadcellhousingandreinstallintoholder.
• Testheater.
3. Iftheheaterstilldoesnotoperate,replacecadcell.
4. Replaceoilflamecontrolassembly.
PowerLight Powertocontrol 1. Sensingpower.Noactionrequired.
ModelMH50KR and MH75KTR heatersareNOTequippedwithadiagnosticcontrolboardorflashingLEDerrorindicator.Seethe
followingtroubleshootingguideforunitstatusandcorrectiveactionifnecessary.
SYMPTOM TROUBLE SHOOTING
HighlimitswitchOpenCircuit 1) Makesureheateriscooledoff,toggleswitchto“OFF”position,wait5minutesandretry.
Sparks,callingforflame,but 1) Checkwiringtomotor(perwiringschematicinmanual).
noorslowmotoroperation 2) Makesurethatthepressuregaugeisinplaceandnotdamaged.
3) Adjustpressureforproperheateroperationpermanual.
4) WithheaterdisconnectedfromACsource,rotatefanclockwisetoverifymotorisfree.
5) Removeairfilterhousingfrommotorandinspectthepumprotorfordamage.Ifdamaged,replacerotorassembly.
6) Ifwiringiscorrect,pumprotorisokay,andmotorisnotrotatingfreely,replacemotororpower-packassembly.
7) Ifproblempersists,replaceoilflamecontrolassembly.
8) Checkforsparkarchingfromtheelectrodeassembly,tothecombustioncylinder.
9) Checkthecadcellforcontinuity.
NoSpark 1) Checklengthandgageofextensioncordforproperamp.draw.(Checkrequirementsonpage4.)
2) Checkwiringtoigniter(perwiringschematicinmanual).
3) Checkgapbetweenelectrodeprobes(2.3-3mm).
4) Stillnospark,replaceigniterassembly.
5) Replaceoilflamecontrolassembly.
AbnormalMotorOperation- 1) Motorspeedtoolow(Motorshouldoperateat3450rpm)-Replacemotor.
MotoroverheatsorStops 2) WithheaterdisconnectedfromACsource,rotatefanclockwisetoverifymotorisfree.
3) Removeairfilterhousingfrommotorandinspectthepumprotorfordamage.Ifdamaged,replacerotor
assembly.
4) Ifwiringiscorrect,pumprotorisokay,andmotorisnotrotatingfreely,replacemotororpower-packassembly.
5) Replaceoilflamecontrolassembly.
UnabletoDetectFlame 1) Checkwiringtocadcell(perwiringschematicinmanual).
2) Cleancadcellphotocell.
a) Slidecadcelloutofcadcellholder.
b) Pushthephotocelloutoftheblackrubbercadcellhousingbypushingonthe2purplewires.
c) Cleanthephotocellwithasoftclothandrubbingalcohol.
d) Pullthephotocellbackintothecadcellhousingandreinstallintoholder.
e) Testheater.
3) Iftheheaterstilldoesnotoperate,replacecadcell.
4) Replaceoilflamecontrolassembly.
FlameControlFailure 1) Checkwiringinheater(perwiringschematicinmanual).
2) Replaceoilflamecontrolassembly.
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