Lennox MPB036S4M

108
Error Code: E4
Description: Temp.sensorerror-outdoorcoilsensor(T3),outdoorambientsensor(T4),compressordischargesensor(T5),indoorunit
coiloutlettemp.sensor(T2)
General Note: Errordisplaysifvoltageislowerthan0.06Vorhigherthan4.94V.
Checktheconnectionsbetweentempera-
turesensorandPCB.Aretheconnec-
tionsgood?
Yes
No
No
Correcttheconnections
Checktheresistancevalueofthesensor
via Appendix 1 and Appendix 2.
Yes
Replaceindoororout-
doorPCB.
Isitnormal?
No
Replacethesensor.