Cause: PFC board is a component of the inverter air conditioner for
power factor correction and voltage boosting. When the PFC board
cannot perform power calibration as normal because of overcurrent and
overvoltage, it will indicate “PFC protection error” and its function
may also be integrated with the module panel or main PCB.
Inspection path: Supply voltage→AC and DC power path→PFC
board data wire→PFC board→Main PCB
1. Check if the supply voltage is unstable and highly volatile or the
voltage is too low (below AC 135V)
2. The reactor is one of core parts of PFC. Check if the reactor itself is
destroyed and the reactor connecting wire is in poor connection, which
makes PFC functions not performed. Do not remove the reactor and
replace with short circuit by no means.
3. If “PFC protection error” will be indicated immediately after starting
up, it is almost certain that it’s substantial error, having nothing to do
with supply voltage, it is suggested to observe if there is any
component destroyed by strike arc near the module panel
4. Test if the 15V and 5V (3.3V) power supply on the PFC board is
stable and exclude the PFC board error caused by power supply of the
Outdoor Unit main PCB.
5. Replace with the PFC board in normal condition for test. If the test is
normal after changing the PFC board, then the original PFC board is
destroyed.
6. The possibility that there is something wrong with 15V or 5V power
of the module panel that causes the control power supply problem of
the PFC board is not excluded.
7. Some module panels integrate PFC function and compressor drive
function in one, so just replace with an integrated module panel.
8. For single-panel single-chip main PCBs, if PFC protection error
appears, and there is no problem in supply voltage, reactor connection
or reactor, just replace the controller of the Outdoor Unit.
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