Kaisai R ON-OFF series, User Manual

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9.2.2 Open or short circuit of temperature sensor diagnosis and solution.
9.2.3 Over current protection occurs 4 times.
Current
protection
Check if the voltage
of power supply is too
low?
The power supply is
problematic
Check if the
operation condition is
normal, especially the
outdoor unit?
Turn on the units
and check if the
problem remains
Disconnect with the
power and replace
the main PCB
Check if the
compressor is
normal?
Replace the
compressor
Check if the
capillary is
blocked
There is some air
mixed inside the
refrigerant system
Correct the
operation
condition
Replace the
capillary
Evacuate the
refrigerant system
and recharge gas
Yes
Repair the power
supply
No
No
Yes
Yes
Yes
Yes
No
No
Yes
Replace outdoor PCB
Yes
Check the connections between
the sensors and the PCB. Are the
connections good?
Replace the sensor and check if
the errors happen again?