ACiQ PH status display

What it means

PH on the outdoor board means compressor pre-heating is running before operation. It is a status display, not a failed part.

Urgency

Likely causes

Homeowner fix

Leave power applied and wait for the preheat condition to clear, especially in cold weather.

When to call a pro

No technician is needed for this status by itself. Call for service only if comfort is poor, water is present, or the indication never clears after conditions change.

Repair vs replace

This is a normal operating status, not a repair-or-replace decision.

• ACiQ Multi-Zone Extreme Series 2-Zone 18,000 BTU R-454B 208/230V (ACIQ-18Z-HH-M3C)

  Multi-Zone Extreme Series

• ACiQ Multi-Zone Extreme Series 3-Zone 27,000 BTU R-454B 208/230V (ACIQ-27Z-HH-M4C)

  Multi-Zone Extreme Series

• ACiQ Multi-Zone Extreme Series 4-Zone 36,000 BTU R-454B 208/230V (ACIQ-36Z-HH-M5C)

  Multi-Zone Extreme Series

• ACiQ Multi-Zone Extreme Series 5-Zone 48,000 BTU R-454B 208/230V (ACIQ-48Z-HH-M6C)

  Multi-Zone Extreme Series

For your technician

Technician note: status display only; confirm normal operation before using error-code diagnostics. Page context: ACiQ maps this display to the Multi-Zone Extreme Series line; source: ACiQ Multi-Zone Service Manual and shared Midea D5CMRA Table 20 display reference; display convention: match the letter P and letter H marker exactly before comparing neighboring codes.

Which systems show it

Multi-Zone Extreme Series

Sold under more than one brand

Shared with Midea. ACiQ and Midea document this code from the same manufacturer source, so PH 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.

Related codes

Source

Next step