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7.8
F0/PC 08 (Current overload protection diagnosis and solution)
Description: An abnormal current rise is detected by checking the specified current detection circuit.
Recommended parts to prepare:
• Connection wires
• Reactor
• Outdoor fan
• Outdoor PCB
Troubleshooting and repair
Was the protection activated
Is the input voltage normal?
Is the voltage between L and N
is the voltage between P and N
around DC 310V, 340V or 380V?
When starting up the unit, is it
Is the outdoor fan running
Is the heat exchanger dirty?
board. Does a problem still
Is system pressure too high?
Check whether the refrigerant
system is running normally
Note: For certain models, outdoor PCB cannot be removed separately. In this case, the outdoor electric
control box should be replaced as a whole.
:
in standby ?
No
Yes
Is outdoor terminal voltage
No
normal?
Yes
No
is normal?
Yes
Yes
Is the current normal?
No
Skip this step for
Power on and measure the
models which electric
voltage between P and N.
control box cover
cannot be removed. See
While the unit is in standby,
the disassembly guide
for details.
in range of 220V~400V?
Yes
Is the outdoor ambient
temperature is higher than
Yes
122°F?
No
Is the outdoor unit
Ensure that the outdoor unit is able
able to ventilate
No
properly?
Yes
No
properly?
Yes
Yes
No
Replace outdoor main
exist?
Yes
Yes
No
Troubleshooting
Restart the unit when the power
No
supply returns to normal
Is the power wiring
wired correctly?
Are L and N wired
properly ?
Replace the outdoor main PCB
Is the wiring of the
No
reactor properly wired?
Stop the unit until temps drop
Are the reactor and
inductance functioning
to ventilate properly
Please refer to the solution of the
"fan speed is operating outside of
the normal range" malfunction.
Clean the heat exchanger
Recycle the overcharged
refrigerant
29
Yes
Reconnect the
power wiring
Reconnect L and N
No
Reconnect the wiring
Yes
No
Replace reactor
normally
Yes
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