Lennox MPB036S4M

134
Error Code: EC
Description: LowRefrigerantError
General Note: ThesystemmonitorsthevalueofevaporatorcoilsensorT2fortherst5minutesafterstartup.IfthetemperatureofT2
dropsperthisformulathreetimesintherst5minutesofoperation,thesystemshutsdownandtheerrorcodedisplays.
Forthisformula“Tcool”=theT2temperatureatstartup.
T2<Tcool-3.6°F(2°C)
EC
Poweroffthenrestarttheunitin2min-
utes.
Yes
Yes
ChecktheT2sensor.Is
it functioning
Checktoseeifcoolairisblowingoutof
theindoorairoutlet
No
Yes
ReplacetheindoorPCB
Checkforrefrigerantleaks.
No
Yes
Repairleaksandre-
chargesystem.
Checkforrestrictioninrefrigerantlines.
Clear restriction.