Lennox Mini-Split Service Manual / Page 146
E2 Flowchart
E2
Start: Power off, then Power on the A/C
by the Breaker. (reconnect the power
wire). Is it still displaying the error code?
Check wiring on the outdoor and indoor
terminals follow the wiring diagram. Are
all of the connections correct?
Yes
Yes
Correct the wiring
No
Turn on all indoor units by the remote
controller. Are all indoor units dis-
playing correctly?
No
Measure Vs, is it moving alternately
between positive value and negative
value? (Vs is the voltage between S
and L2). Refer PIC 1
No
A: Is all the wiring between
terminals and indoor PCB
connected correctly`?
No
No
Reconnect the wiring
Yes
Change the Indoor PCB
Yes
Power on by remote controller, it
is still displaying the error code
after 3 minutes?
No
Yes
Turn off all of the indoor units.
Is IPM power LED operating
LED lamp on? Refer PIC 2.
Yes
Yes
Change IPM
No
Yes
Is main board”88” lamp on?
Refer PIC 3.
No
Is the reactor
wiring properly
connected?
No
Reconnect the
wiring
Yes
Change Outdoor Main PCB
Yes
Are the indoor units numbered correctly? Check
on the outdoor check point. (2 for 2-zone, 3 for
3-zone, 4 for 4-zone). Refer PIC 4.
Problem Solved
Change outdoor unit PCB as-
sembly totally (include wiring).
No fi rst time
No second time
A
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