DELUXE
Inverter
Service
M
anual
(10) F2- PFC protection error
Explanation 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 for
inspection
Multimeter, PFC board in normal condition
Frequent
problematic part
Supply voltage, reactor, PFC board, module panel, main external control
panel
Inspection
procedure and key
points
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
by no
means should it be
replace
d
with
a
short circuit.
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 main external
control panel.
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 control panels, if PFC protection error
appears, and there is no problem in supply voltage, reactor connection or
reactor, just replace the controller of the external unit.
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