Lennox MPB012S4S Service Manual

129
Error Code: E1
Description: Communicationmalfunctionbetweenindoorunitandoutdoorunit.
General Note: PCBmainchipdoesnotreceivefeedbackfromIPMmoduleduring60seconds.
CommunicationmalfunctionbetweenIPM
board and outdoor main board.
IsthereatleastoneLEDintheIPM
boardlight?
No
CheckthesignalwirebetweentheIPM
moduleandthemainboard,isitcon-
nectedgood?
No
Reconnectandretry.Iserrorstilldisplay?
No
ReplaceIPMboard,andthencheck
whetherthesystemcanrunnormally.
No
Replaceoutdoormainboard,andthen
checkwhetherthesystemcanrunnor-
mally.
No
Replacetheelectriccontrolbox.
Problem Solved.
Yes
Yes
No
Yes
Yes
Yes

Lennox MPB012S4S Specifications

General

Brand	Lennox
Model	MPB012S4S
Category	Air Conditioner
Language	English