INNOVAIR DC INVERTER NEXXOS
SERVICE MANUAL
w w w . i n n o v a i r . c o m
5.13 P6(Low pressure protection diagnosis and solution)
Description:
When the pressure of system reach a certain value, the low pressure protector will switch off. After the
pressure resume to normal ,the protection code will disappear.
Recommended parts to prepare:
• Wiring mistake
• Pressure protector faulty
• Fan motor faulty
• PCB faulty
• System problems
Troubleshooting and repair:
Whether the wiring between
the low pressure protector
and main control board is
connected well or correctly
Method: Disconnect the
plug. Measure the resistance
of the low pressure
protector. If the protector is
normal the value is o
Yes
Yes
Connect it well
Replace outdoor main board
No
Replace low pressure protector
No
Whether the low
pressure protector
is broken
Check whether the outdoor
ambient temperature is too
low
No
Stop the unit
Yes
Open fully valve core of high
pressure valve
No
Check whether valve core of
high pressure valve is opened
Check if the indoor fan runs
properly in cooling mode
please refer to the solution of [fan speed
has been out of control malfunction].
Find out the cause and have it solved.
No
Yes
Yes
No
Check whether the
refrigerant system is ok
Refrigerant is not enough add the
refrigerant
No
92