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SDi Decades Extreme Service Manual www.ecoer.com
May. 2023Manufacturer reserves the right to change specifications or designs without notice.
8.7.8 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:
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? 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 start up the unit, is it in
220V~400V?
Replace the IPM board.
NO
Check the reactor.
YES
Is it in working order?
Replace outdoor PCB.
NO
Skip this step for models which
electric control box cover cannot
be removed.See the disassembly
guide for details.
Replace the reactor.
YES
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