Lennox Mini-Split Service Manual / Page 161
E6 Flow Chart
PFC module protection
Check that the
connecting wiring between main board
and the PFC module is connected tightly.
Yes
Check the voltage range between
P-N on IPM module is normal? DC277-
356V for 18-27KBtu/h; DC277-410V 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.
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