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112

Error Code: E5 (continued)

Remark:

Measure the DC voltage

between + and - port. The

normal value should be

190V~250V.

Error Code: E6

Description: PFCmoduleprotection.(ForMPA036S4M-1PandMPA048S4M-1P)

General Note: WhenthevoltagesignalthatPFCsendstomaincontrolboardisabnormal,thedisplayLEDwillshow“E6”andunitwillturn

off.

PFCmoduleprotection

Checkthatthe

connectingwiringbetweenmain

boardandthePFCmoduleiscon-

nectedtightly.

Yes

Checkthevoltagerangebetween

P-NonIPMmoduleisnormal?277-

356VDCfor18-30KBtu/h;277-

410VDCfor36KBtu/h.

CheckiftheinductanceofthePFC

moduleisgood.Iftheinductoris

good,theresistancevalueofthe

twoportsis0.

Yes

ReplacethePFCmodule.

Problem

Solved.

Yes

Correctfaultyconnections,then

checkproperunitoperation

Yes

Replacetheoutdoormainboard.

Replacetheinductor.

Lennox MPB012S4S Service Manual

Questions and Answers: