Vivax ACP-09CH25AEI, Service Manual, Page: 50 / 54

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9.2.5 Open or short circuit of temperature sensor diagnosis and solution.
9.2.6 IGBT over-strong current protection diagnosis and solution.
9.2.7 Over voltage or too low voltage protection diagnosis and solution.
Is the power supply good?
Replace the outdoor e-box.
Make sure the power supply is normal.
Yes
No
Yes
Fastening the IPM to the radiator
No
Check whether the connections between
outdoor PCB and IPM are good?
Check whether the IPM is fixed to radiator
tightly
Replae the IPM
The unit does not work normally
Replace the compressor
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?
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