Lennox MPA018S4M-*P - Page 112

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.
No
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
No
Yes
No
Replacetheoutdoormainboard.
No
Replacetheinductor.