11
Cause of Error
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 control panel.
Inspection path: Supply voltage → AC and DC power path
→ PFC board data wire → PFC board → Main control panel
Tools Required
Multimeter, PFC board in normal condition
Possible Broken Part
Supply voltage, reactor, PFC board, module panel, outdoor
unit controlpanel
Troubleshooting
Procedures
1. Check if the supply voltage is unstable or if the
voltage is too low (below AC 135V).
2. Check if the reactor itself is destroyed and the reactor
connecting wire is in poor condition.
3. If “PFC protection error” happens immediately after
startup, observe if there is any component destroyed
by a strike arc near the module panel.
4. Test if the 15V and 5V (3.3V) power supply on the PFC
board is stable.
5. Replace with the PFC board. If the unit is normal after
changing the PFC board, then the original PFC board
is destroyed.
6. If PFC protection error appears and there is no
problem with the supply voltage, reactor connection
or the reactor, replace the controller of the external
unit.
F2 – PFC PROTECTION ERROR
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