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Lennox MPA009S4S User Manual

Lennox MPA009S4S
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121
Error Code: P3
Description: Outdoorcompressorcurrentoverloadsensed
General Note: Iftheoutdoorcurrentexceedsthecurrentlimitvalue,theLEDwilldisplaythefailure.
Current protection of compressor.
Checkwhethertheinputcurrentofthepower
supplyshouldnotexceedmorethan12Afor18KBTU
units.
For30K,18.5A.
For36K,itis23A.
Yes
CheckwhethertherefrigerantsystemisOK.
Checkwhethertheoutdoorambienttemperature
ishigherthan50°Cor122F
No
Replaceoutdoormainboard.
No
Stoptheunit.
Yes
Checkifoutdoorunithasproperventilation.
No
Correct poor ventilation to outdoor unit.
Yes
Checkoutdoorcoils.Outdoorcoilsshouldbeclean
and free of any debris.
Clean outdoor coils.
Yes
No
Judge5:Therefrigerantpipeisblocked.
Recoverrefrigerantandremoverestriction(s).
Performpropervacuumprocedures,then
restart system.
Yes
No
Replaceoutdoormainboard,andcheckwhetherthe
system can run normally.
No
Replacetheelectriccontrolbox.
Problem Solved.
Yes
Yes

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Lennox MPA009S4S Specifications

General IconGeneral
BrandLennox
ModelMPA009S4S
CategoryAir Conditioner
LanguageEnglish

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