Lennox Mini-Split Service Manual / Page 213
F0 Flow Chart
Current protection of compressor.
Check whether the input current of the power
supply should not exceed more than 12A for 18K BTU
units
For 27K, 17A.
For 30K, 18.5A.
For 36K, it is 23A
Yes
Check whether the refrigerant system is OK.
Check whether the outdoor ambient temperature
is higher than 50°C or 122 F
No
Replace outdoor main board.
No
Stop the unit.
Yes
Check if outdoor unit has proper ventilation.
No
Correct poor ventilation to outdoor unit.
Yes
Check outdoor coils. Outdoor coils should be clean
and free of any debris.
Clean outdoor coils.
Yes
No
Judge 5: The refrigerant pipe is blocked.
Recover refrigerant and remove restriction(s).
Perform proper vacuum procedures, then
restart system.
Yes
No
Replace outdoor main board, and check whether the
system can run normally.
No
Replace the electric control box.
Problem Solved.
Yes
Yes
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