Midea PC01 error code

What it means

PC01 means the outdoor unit saw supply voltage or DC bus voltage outside the expected range. It may be a utility/brownout issue, wiring issue, or outdoor-board fault.

Urgency

Likely causes

1. Brief power event, brownout, or unstable supply voltage
2. Loose power connection, reactor, or outdoor electrical component problem
3. Inverter/IPM protection or current-detection fault
4. Compressor winding, drive, or outdoor board fault after power checks pass

Homeowner fix

Turn the system off and note whether lights dimmed, storms occurred, or other appliances had power trouble. Reset once only after power is stable. If PC01 returns or any breaker trips, stop there.

When to call a pro

Call a licensed HVAC technician or electrician if PC01 returns, a breaker trips, or other circuits show voltage trouble. Tell them the code is outdoor voltage protection.

Repair vs replace

This is normally a repair diagnosis, not an automatic replacement signal. If a technician confirms a major board, compressor, fan motor, or refrigerant-circuit repair on older out-of-warranty equipment, compare the quote with replacement.

• Midea Advantage Series Multi-Zone 3-Zone 18,000 BTU R-454B 208/230V (D5CMRAH18CAK)

  Advantage Series Multi-Zone

• Midea Advantage Series Multi-Zone 4-Zone 24,000 BTU R-454B 208/230V (D5CMRAH24DAK)

  Advantage Series Multi-Zone

• Midea Advantage Series Multi-Zone 5-Zone 30,000 BTU R-454B 208/230V (D5CMRAH30EAK)

  Advantage Series Multi-Zone

• Midea Advantage Series Multi-Zone 5-Zone 36,000 BTU R-454B 208/230V (D5CMRAH36EAK)

  Advantage Series Multi-Zone

For your technician

Technician note: section 7.4.2.5 covers E5/PC10/PC11/PC12 voltage rise/drop detection; verify supply and DC bus before replacing boards. Page context: Midea maps this display to the Advantage Series Multi-Zone line; source: Midea D5CMRA Installation Instructions Table 20 and shared ACiQ/Midea Multi-Zone Service Manual; display convention: match the letter P, letter C, and one marker exactly before comparing neighboring codes.

Which systems show it

• Midea Advantage Series Multi-Zone D5CMRA R-454B outdoor condensers and matched indoor units covered by Table 20.
• Midea Advantage Series Multi-Zone High-Heat D5CMHA systems where the D5C installation/error-code convention is shared.
• Midea current R-454B single-zone high-wall families when the indoor display uses the same EC/EH/EL/PC homeowner code convention.

Sold under more than one brand

Also sold as ACiQ. Midea and ACiQ document this code from the same manufacturer source, so PC01 means the same thing on either badge and the steps above apply.

Related troubleshooting

Use the symptom guide alongside the exact display code if the unit is flashing, cycling, or showing comfort symptoms.

Reset note

Turn the system off and note whether lights dimmed, storms occurred, or other appliances had power trouble. Reset once only after power is stable. If PC01 returns or any breaker trips, stop there.

Manual trigger

PC01 means the outdoor unit saw supply voltage or DC bus voltage outside the expected range. It may be a utility/brownout issue, wiring issue, or outdoor-board fault.

Related codes

Source

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