Daikin CHECKING CONNECTION status display

What it means

A Daikin wired controller can show a connection-check message during startup. The MXM manual says this can be normal for up to about 180 seconds after power is applied.

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

Wait up to 3 minutes after power is restored. If the message clears and normal operation returns, no repair is needed.

When to call a pro

Call for service if the message stays beyond startup or changes to U5 or another communication code.

Repair vs replace

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

• Daikin AURORA 9,000 BTU R-32 208/230V (FTXV09AVJU9 / RXT09AVJU9)

  AURORA R-32

• Daikin AURORA 12,000 BTU R-32 208/230V (FTXV12AVJU9 / RXT12AVJU9)

  AURORA R-32

• Daikin AURORA 15,000 BTU R-32 208/230V (FTXV15AVJU9 / RXT15AVJU9)

  AURORA R-32

• Daikin AURORA 18,000 BTU R-32 208/230V (FTXV18AVJU9 / RXT18AVJU9)

  AURORA R-32

Parts for this line

The parts catalog for Daikin AURORA R-32 lists 7 sourced replacement parts for this product line.

For your technician

Technician note: if the startup message persists, check controller wiring, indoor PCB, and communication diagnosis; do not condemn parts during the normal startup window. Page context: Daikin maps this display to the AURORA R-32 line; source: Daikin Nineteen, ATMOSPHERA, Entra, and MXM/MXT/MXTH local service manuals; display convention: match the letter C, letter H, letter E, letter C, letter K, letter I, letter N, letter G, letter C, letter O, letter N, letter N, letter E, letter C, letter T, letter I, letter O, and letter N marker exactly before comparing neighboring codes.

Which systems show it

• Daikin current US residential R-32 ductless single-zone systems, including AURORA R-32, ATMOSPHERA R-32, Entra R32, OTERRA R-32, and Nineteen-series style high-wall diagnostics where the same Daikin A/C/E/F/H/J/L/P/U code family is used.
• Daikin concealed-duct/FDMQ indoor units where the Nineteen service manual explicitly lists the same indoor drain, fan PCB, remote-controller, and FDMQ-only C/U codes.
• Daikin AURORA Multi R-32 and Standard Multi R-32 MXT/MXTH/MXM systems where the MXM engineering manual lists the same homeowner code table.
• MXM/MXT/MXTH multi-zone systems for the additional multi-zone U-series and inverter/control codes specifically called out from the MXM manual.

Related troubleshooting

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

Reset note

Wait up to 3 minutes after power is restored. If the message clears and normal operation returns, no repair is needed.

Manual trigger

A Daikin wired controller can show a connection-check message during startup. The MXM manual says this can be normal for up to about 180 seconds after power is applied.

Related codes

Source

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