Kaisai KFU-09HRDN1-QRC8GW, Service Manual

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9.2.10 High temperature protection of compressor top diagnosis and solution(P2)
Check if the air flow system
of indoor and outdoor units
are obstructed?
Clear up the air inlet and outlet or the heat
exchanger of indoor and outdoor units.
Yes
No
Yes
Yes
Turn off the power supply and turn
it on 10 minutes later.
Check if the unit can
start normally.
No
Check if the refrigerant
charge volume is normal?
Recharge the correct
refrigerant volume.
Refrigerant system is blocked, such
as capillary or welded point of pipes.
Yes
Check if all the connection, especially
the connection of OLP (Over Load
Protector) sensor is good.
Correct the connection. No
Measure the resistance
between the two ports of
the OLP. Is it zero?
Yes
Replace the OLP. No
Replace the outdoor control PCB. Yes
No