Lennox MS8 SERIES Installation And Service Procedures page 78

OUTDOOR UNIT OVERLOAD AND DISCHARGE LINE SENSOR MALFUNCTION
MS8C / MS8H (208-230V)
Is the electronic
expansion valve terminal
FA connected correctly.
Y
Resistances between the blue wire
terminal and all other wire terminals
should be within +5 of each other.
Replace electronic
expansion valve
N
Is fault
corrected?
N
Check for refrigerant
leak, correct leak and
correct charge
N
Is fault
corrected?
N
Replace
Outdoor
control
End
FIGURE 87
Page 78
APPLICABLE UNIT SIZE(S): All
APPLICABLE ERROR CODE(S): E4, H4
N
Is wired
correctly?
Y
Y