Midea DLFSHBH18XAK - Overload current protection (PC08)

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DIAGNOSIS AND SOLUTION (CONT)
Overload current protection (PC08)
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
in standby?
Yes
Yes
No
R
ep
lace the outdoor main PCB
Replace the outdoor main PCB
Is the power voltage normal?
Restart the unit when the power supply
returns to normal.
No
Yes
No
Yes
Yes
No
Is the power wiring
wired correctly?
No
No No
Yes
No
No
Yes
Is t
h
e out
d
oor unit
ventilation functionin
g
proper
ly
?
Is the outdoor unit
ventilation functioning
properly?
Yes
Ensure that the outdoor unit’s
ventilation is working properly.
Is the heat exchanger dirty ?
No
Clean the heat exchanger.
Yes
Replace the outdoor main board.
Does the problem still exist?
Yes
No
Is the outdoor fan running properly?
No
Yes
No
Yes
Yes
Is system pressure too high ?
Recycle the overcharged
refrigerant.
Yes
Are the
reactor and
inductance functioning
normally?
Replace the reactor.
Is the outdoor terminal
voltage normal?
Reconnect the
power wiring.
Reconnect L and N.Are L and N wired correctly?
Is the voltage between
L and N normal?
Is the current normal?
Power ON and measure the
voltage between P and N.
While the unit is in standby, is the
voltage between P and N? Is it
around DC 310V, 340V or 380V?
When the unit starts up,
is it 220V~400V?
Is the reactor wiring
properly connected?
Reconnect the wiring.
Is the outdoor ambient
temperature higher than 50°C?
Stop the unit.
Refer to the
Fan Speed is Operating Outside
of Normal Range (EH03)
solution
Check whether the refrigerant system
is running normally?