Daikin A3: drain level control abnormality on the indoor unit

What Does Error A3 Mean?

Daikin assigns A3 to the drain level control system in the indoor unit division of its malfunction chart. The control detected that the condensate level or the drain system response was outside normal, and it stopped operation to prevent the tray overflowing. The chart names the system, which is why A3 covers the float switch, the drain pump, and the path between them rather than any one of them. Applies to: Daikin indoor units covered by the SM-TS3 malfunction code chart, spanning room air, SkyAir, and VRV indoor equipment A3 is read from the Daikin After Sales Service malfunction code chart, which divides codes by unit rather than by model. The chart gives the meaning of the letter and detail code; the component layout behind it comes from the service manual for the specific indoor unit. A wall-mounted room air unit without a drain pump does not carry the same detection. Owner-safe checks: Select fan operation or switch the affected indoor unit off so the coil stops condensing while the fault is outstanding. | Record the unit number shown beside A3 and the room that unit serves, which identifies the address for service. | Check whether the external condensate discharge point produced any water during the period the unit had been cooling. Qualified technician: Opening a cassette decoration panel, testing a float switch, or clearing a drain pan inside the indoor unit is qualified service work on this equipment. | Any water that has reached ceiling material, lighting, or an electrical accessory is a stop condition, and the indoor unit should be isolated rather than restarted.