Lennox Mini-Split Service Manual / Page 189
P4 Flow Chart
Temperature protection of compressor.
Check whether the compressor discharge temp. is
more than 115°C ?
No
Check whether the connection is right between com-
pressor discharge temp. sensor and PCB according to
wiring diagrams?
Check whether the
refrigerant is leak.
Yes
Stop leaking and add
refrigerant.
Yes
No
Correct the wiring con-
nection.
No
Yes
Measure the resistance value of compressor dis-
charge temp. sensor. If the value is not normal is
normal refer to the Appendix 2?
Replace the compressor
discharge temp. sensor.
No
Yes
Replace outdoor main PCB.
No
Replace high pressure valve assy.
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