Troubleshooting - Mr. Heater MH80KTR Operating Instructions And Owner's Manual

NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
DIAGNOSTIC SAFETY SHUTDOWN AND TROUBLE SHOOTING
Model­MH140KTR, MH185KTR and MH210KTR­heaters­are­equipped­with­a­diagnostic­control­board­and­flashing­LED­error­indicator.­
This­flashing­LED­signals­indicate­unit­operation­status.­See­the­following­diagnostic­guide­for­unit­status­and­corrective­action­if­necessary.
LED UNIT OPERATION
Steady­ON System­Check
Steady­OFF Operation­OK
2­Flashes No­flame­detected
3­Flashes High­limit­switch­
failure
4­Flashes CAD­Cell­Failure
Power­Light Power­to­control
Model­MH50KR and MH80KTR heaters­are­NOT­equipped­with­a­diagnostic­control­board­or­flashing­LED­error­indicator.­See­the­
following­troubleshooting­guide­for­unit­status­and­corrective­action­if­necessary.
SYMPTOM
High­limit­switch­Open­Circuit­
Sparks,­calling­for­flame,­but­
no­or­slow­motor­operation­
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No­Spark­ ­
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Abnormal­Motor­Operation­-­
Motor­overheats­or­Stops­
­ ­
­ ­
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Unable­to­Detect­Flame­
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Flame­Control­Failure­
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Mr. Heater, Inc. | Kerosene Forced Air Heater
TROUBLE SHOOTING
System­performing­self­test.­No­action­required.
No­action­required.
Heater­fails­to­start­during­the­first­30­sec.­of­operation.
1.­ Check­wiring­to­motor­(per­wiring­schematic­in­manual).
2.­ Make­sure­that­the­pressure­gauge­is­in­place­and­not­damaged.
3.­ Adjust­pressure­for­proper­heater­operation­per­manual.
4.­ With­heater­disconnected­from­AC­source,­rotate­fan­clockwise­to­verify­motor­is­free.
5.­ Remove­air­filter­housing­from­motor­and­inspect­the­pump­rotor­for­damage.­If­damaged,­replace­rotor­assembly.
6.­ If­wiring­is­correct,­pump­rotor­is­okay,­and­motor­is­not­rotating­freely,­replace­motor­or­power-pack­assembly.
7.­ If­problem­persists,­replace­oil­flame­control­assembly.
8.­ Check­for­spark­arching­from­the­electrode­assembly­(ref.­#41),­to­the­combustion­cylinder­(ref.­#39).
9.­ Check­the­cad­cell­(ref.­#38)­for­continuity.
1.­ Make­sure­heater­is­cooled­off,­press­reset­switch­and­retry.
1.­ Check­wiring­to­cad­cell­(per­wiring­schematic­in­manual).
2.­ Clean­cad­cell­photo­cell.
•­ Slide­cad­cell­out­of­cad­cell­holder.
•­ Push­the­photo­cell­out­of­the­black­rubber­cad­cell­housing­by­pushing­on­the­2­purple­wires.
•­ Clean­the­photo­cell­with­a­soft­cloth­and­rubbing­alcohol.
•­ Pull­the­photo­cell­back­into­the­cad­cell­housing­and­reinstall­into­holder.
•­ Test­heater.
3.­ If­the­heater­still­does­not­operate,­replace­cad­cell.
4.­ Replace­oil­flame­control­assembly.
1.­ Sensing­power.­No­action­required.
TROUBLE SHOOTING
1)­ Make­sure­heater­is­cooled­off,­toggle­switch­to­"OFF"­position,­wait­5­minutes­and­retry.
1)­ Check­wiring­to­motor­(per­wiring­schematic­in­manual).
2)­ Make­sure­that­the­pressure­gauge­is­in­place­and­not­damaged.
3)­ Adjust­pressure­for­proper­heater­operation­per­manual.
4)­ With­heater­disconnected­from­AC­source,­rotate­fan­clockwise­to­verify­motor­is­free.
5)­ Remove­air­filter­housing­from­motor­and­inspect­the­pump­rotor­for­damage.­If­damaged,­replace­rotor­assembly.
6)­ If­wiring­is­correct,­pump­rotor­is­okay,­and­motor­is­not­rotating­freely,­replace­motor­or­power-pack­assembly.
7)­ If­problem­persists,­replace­oil­flame­control­assembly.
8)­ Check­for­spark­arching­from­the­electrode­assembly,­to­the­combustion­cylinder.
9)­­ Check­the­cad­cell­for­continuity.
1)­­ Check­length­and­gage­of­extension­cord­for­proper­amp.­draw.­(Check­requirements­on­page­4.)
2)­ Check­wiring­to­igniter­(per­wiring­schematic­in­manual).
3)­ Check­gap­between­electrode­probes­(2.3­-­3­mm).
4)­ Still­no­spark,­replace­igniter­assembly.
5)­ Replace­oil­flame­control­assembly.
1)­ Motor­speed­too­low­(Motor­should­operate­at­3450rpm)­-­Replace­motor.­
2)­ With­heater­disconnected­from­AC­source,­rotate­fan­clockwise­to­verify­motor­is­free.
3)­ Remove­air­filter­housing­from­motor­and­inspect­the­pump­rotor­for­damage.­If­damaged,­replace­rotor­­
­ assembly.
4)­ If­wiring­is­correct,­pump­rotor­is­okay,­and­motor­is­not­rotating­freely,­replace­motor­or­power-pack­assembly.
5)­ Replace­oil­flame­control­assembly.
1)­ Check­wiring­to­cad­cell­(per­wiring­schematic­in­manual).
2)­ Clean­cad­cell­photo­cell.
­ a)­­ Slide­cad­cell­out­of­cad­cell­holder.
­ b)­­ Push­the­photo­cell­out­of­the­black­rubber­cad­cell­housing­by­pushing­on­the­2­purple­wires.
­ c)­­ Clean­the­photo­cell­with­a­soft­cloth­and­rubbing­alcohol.
­ d)­­ Pull­the­photo­cell­back­into­the­cad­cell­housing­and­reinstall­into­holder.
­ e)­­ Test­heater.
3)­ If­the­heater­still­does­not­operate,­replace­cad­cell.
4)­ Replace­oil­flame­control­assembly.
1)­ Check­wiring­in­heater­(per­wiring­schematic­in­manual).
2)­ Replace­oil­flame­control­assembly.
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Operating Instructions and Owner's Manual