Cause: The main PCB detects that the working current of the system
exceeds the upper limit of protection, and will indicate "indoor unit
overcurrent protectin:. The air conditioner stopps running for
protection and displays the failure code E0.
Inspection path: current transformer → power line → compressor
line → connector assembly
1. If it is a fixed-frequency model, observe whether the live line passes
through the current transformer; if not, lay the line accordingly and
reboot for inspection.
2. The current clamp is used to measure the working current and
determine whether it is within the normal working current range of the
nameplate. If normal working current is detected, it may be the fault of
the current transformer and replace the main PCB of the indoor unit.
3. Measure whether the power supply voltage is within the normal
operating voltage range; if the working voltage is not normal, it is
necessary to consider whether the local grid voltage is stable.
4. If the working current exceeds the range and the working voltage is
normal, the system may be blocked and the air-conditioning may be
overloaded, which needs to be checked according to the actual
situation.
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