Lennox Mini-Split Service Manual / Page 183
P2 Flow Chart
Low Pressure Connection
Is the wiring between the low pressure switch and
main control board is connected properly.
Yes
Is the low pressure protector broken?
Method: Disconnect the plug. Measure the resistance
of the low pressure protector, if the protector is normal
the value is o,
Yes
Connect it properly..
No
Replace low pressure protector.
No
Check whether the outdoor ambient temperature is to
low.
No
Stop the unit.
Yes
Check whether the high pressure valve is opened.
Yes
Fully open the high pressure valve.
No
Check if the indoor fan runs properly in cooling mode.
Refer to the solution of fan speed mal-
function (E8). Find out the cause correct
it.
No
Yes
Replace outdoor main board.
No
Refrigerant is not enough. Add the refrigerant.
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