Carrier 38MBRCQ36AA3 - Voltage Protection Issues; PC 01;10;11;12 Voltage Diagnosis

38MBRC: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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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:
Check the power supply .
Is it in working order ? Turn o 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
Wh ile the unit is i n standby,
is the voltage between P and N is around
DC 310 V, 340V or 380 V? When start up
the unit, is it in 220 V~400 V?
Replace the IPM board .NO
Check the reactor .
YES
Is it in working order ? Replace outdoor PCB .NO
Replace the reactor .
YES