Cause: The power module is the part to directly drive the compressor
to work. It can protect the machine in time when overcurrent,
overvoltage or overheat occurs and stops the compressor from
working. It will, at the same time, send “shutdown request” to the
module panel. The error triggered by the “shutdown request” is called
“module protection error”.
Inspection path: Supply voltage → Compressor wire, reactor wire →
System blocked → Module panel damaged → Outdoor Unit main PCB
destroyed → Compressor destroyed
Multimeter, pressure gauge, megameter, module panel in normal
condition
Supply voltage, compressor wire, reactor, system pressure, module
panel, Outdoor Unit main PCB, compressor
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