6607 No ACK error

What does 6607 mean?

This error means that a unit did not receive an acknowledgment signal from another unit. This can happen if an indoor unit's address was changed during operation, if transmission wiring is faulty, or due to a controller failure.

• IC unit address changed or modified during operation.
• Faulty or disconnected IC transmission wiring.
• Disconnected IC connector (CN2M).
• Indoor unit controller failure.
• ME remote controller failure.

Click steps to track your progress.

1. 1

   Turn off both the outdoor and indoor units at the circuit breaker for 5 or more minutes, then turn them back on.

2. 2

   Verify that the indoor unit (IC) address was NOT changed or modified while the system was powered on.

3. 3

   Check the transmission wiring for the indoor unit and remote controller for any signs of damage or loose connections.

4. 4

   Ensure the IC connector (CN2M) is securely connected.

5. 5

   Check the voltage of the transmission line for approximately 25V (this may require a multimeter and a professional).