Lennox MPB036S4M

141
Error Code: F5
Description: Outdoorunitfanspeederror
General Note: Whenoutdoorfanspeedkeepstoolow(300RPM)ortoohigh(2400RPM)forcertaintime,theunitwillstopandtheLEDwill
displaythefailure.
Outdoorfanspeedmalfunction
Poweroff,thenrestarttheunit3minutes
later.Isitstilldisplayingtheerrorcode?
Yes
Shutoffthepowersupply,andinspectall
componentsfordamage.Rotatethefan
byhand,theFanshouldofferlittleresis-
tancewhenmanuallyspun.Wheeland
shaftshouldspinevenlyandbalanced.
Yes
Checkallwiringconnections.
Yes
CheckmainPCB,seeindex1.
Theunitoperatesnormally.
No
Yes
Replacethefanmotor.
Makenecessarycorrections
No
Correct faulty corrections.
No
ReplacethemainPCB.
No
No