Pc 01(Over Voltage Or Too Low Voltage Protection)/Pc; Voltage Protection)/Pc 11(Outdoor Unit Main Control Board Dc Bus High Voltage - Mars Comfort-Aire Century VCD-SA Series Service Manual

7.8 PC 01(Over voltage or too low voltage protection)/PC 10(Outdoor unit low AC

voltage protection)/PC 11(Outdoor unit main control board DC bus high voltage

protection)/PC 12(Outdoor unit main control board DC bus high voltage protection
/341 MCE error) 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:
is the voltage between P and N is around
DC 310V, 340V or 380V? When start up
Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric
control box should be replaced as a whole.
Check the power supply.
Is it in working order?
YES
Check the connections and wires.
Are they in working order?
YES
Power on and measure the
voltage between P and N.
While the unit is in standby,
the unit, is it in 220V~400V?
YES
Check the reactor.
Is it in working order?
YES
Replace the reactor.
Troubleshooting 31

NO Turn off the unit.
Ensure proper connections or
NO
replace the wires.
Skip this step for models which
electric control box cover cannot
be removed.See the disassembly
guide for details.
NO Replace the IPM board.
NO Replace outdoor PCB.

Service Manual - VCDxxSA