Owner's Manual

mrcool.com Page 52
10.9 Error Code: PC 01 (Over voltage or too low voltage protection diagnosis and solution)
Description: Abnormal increases or decreases in voltage are detected by checking the specified voltage
detection circuit.
Recommended parts to prepare:
•
Power supply wires
•
IPM module board
•
PCB
•
Reactor
Troubleshooting and repair:
Check the power supply..
Is it in working order? Turn off the unit. NO
Check the connections and wires.
YES
Are they in working order?
Ensure proper connections or
replace the wires.
NO
Power on and measure the
voltage between P and N.
YES
While the unit is in standby, is
the voltage between P and N is around
DC 310V, 340V, or 380V? When the
unit is started, is it in 220V~400V?
Replace the IPM board..NO
Check the reactor.
YES
Is it in working order? Replace outdoor PCB.
NO
Replace the reactor.
YES
Note: For certain models, the outdoor PCB cannot be removed separately. In this case, the outdoor
electric control box should be replaced as a whole.
****Disclaimer****
The error codes and descriptions are for reference only. If your system displays any of
these codes contact a qualified technician to investigate the matter further.