Carrier 38MARBQ12AA3 - Current Overload Protection (PC08)

SG-38MARB-01 Specifications subject to change without notice. 45
DIAGNOSIS AND SOLUTION (CONT)
Current Overload Protection (PC08)
Description: An abnormal current rise is detected by checking the specified detection circuit.
Recommended parts to repair:
• Communication wires
• Reactor
• Outdoor fan
• Outdoor PCB
Troubleshooting:
NOTE: For certain models, the outdoor PCB can not be removed separately. In the case, the outdoor electric control box should be
replaced as a whole.
Was the protection activated
in standby mode?
Yes
Yes
No
No
Yes
No
Yes
Yes
No
No
No No
Yes
No
No
Yes
Yes
No
Yes
Yes
No
No
Yes
No
Yes
Yes
Yes
Is the power voltage normal?
Is the power voltage normal?
Restart the unit when the
power supply returns to normal.
Is the power wiring
wired correctly?
Reconnect the
power wiring.
Are the L and N
wired properly?
Reconnect L and N.
Replace the outoor main PCB.
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 mode,
verify that the voltage is between
P and N, is around DC 310V, 340V or 380V?
When starting the unit,
is it in the 220V~400V range?
Is the reactor wiring
properly wired?
Reconnect the wiring.
Is the outdoor ambient
temperature higher
than 50°C?
Stop the unit.
Are the reactor and
inductance functioning
normally?
Replace the reactor.
Is the outdoor unit’s ventilation
working normally?
Ensure that the outdoor unit’s
ventilationis working normally.
Is the outdoor fan working normally?
Refer to the solution of the
“Fan Speed is operating outsode of
the Normal Range” malfunction.
Clean the heat exchanger.Is the heat exchanger dirty?
Replace the outdoor main board.
Does the problem still exist?
Is the system pressure too high?
Check whether the refrigerant
system is running normally.
Recycle the
overcharged refrigerant