Ceiling drip with error code: drain pump motor failed

An A3 error on a ceiling-concealed Daikin, with water dripping below it. A wall unit drains by gravity, but this one cannot, so a pump lifts the water out. When A3 shows up here the fear is a torn-out ceiling, though the drain path is the place to look first.

By Team Snowflake | Updated 28 Jul 2026

Case summary

Daikin Ceiling-concealed7-12 years oldLandedBukit Timah, Singapore

Concern: The homeowner feared the drain pan had cracked, or that the whole concealed unit had to be pulled out of the ceiling to repair.
Found: drain pump motor failure causing drain pan overflow
Key check: Applied power directly to the pump. No motor response confirmed pump failure
Result: We replaced the drain pump. Water drained normally on the first test cycle, and the water-level switch dropped back to its resting position. The A3 error cleared, and the unit ran with no further dripping or shutdowns.

What we were told

The living room aircon keeps showing an error and shutting off on its own. Yesterday water started dripping from the ceiling near the unit. It is a concealed type unit hidden inside the ceiling, so we cannot see what is going on up there.

What we checked

A3 with a drip on a concealed unit pointed to the drain side, since the pump and pan sit out of sight above the ceiling. We opened the ceiling void to inspect the drain pan and pump directly.

The A3 error was active on the Daikin controller.
The drain pan held standing water, close to the overflow level.
The water-level switch sat in the raised position, confirming the pan was full.
The drain pump gave no response when powered. The motor did not spin or hum.
Feeding power straight to the pump motor still produced nothing, which confirmed the motor was dead.

What we found

The drain pump motor had worn out after years of constant use. A concealed unit sits flush in the ceiling, so water cannot run downhill to a drain. The pump has to lift it up to the discharge pipe instead. Once the pump stopped, water had nowhere to go and filled the pan. When it reached the water-level switch, the unit raised the A3 error and shut itself down to stop the pan from spilling further.

What fixed it

The pump motor had reached end of life, and the fix was a single pump replacement. The drain pan, water-level switch, indoor unit, and piping were all intact, so nothing else needed touching. We recommended a matching drain pump rated for this unit's water output. The job meant opening the ceiling void, disconnecting the old pump, and fitting the new one in the same spot. No part of the ceiling had to be torn out.

Outcome

We replaced the drain pump. Water drained normally on the first test cycle, and the water-level switch dropped back to its resting position. The A3 error cleared, and the unit ran with no further dripping or shutdowns.

What this case teaches us

On a concealed unit, A3 points to the pump before the ceiling

A ceiling-concealed unit cannot drain by gravity. A small pump does the work, and that pump is the part most likely to wear out.
A3 with a drip usually means water has backed up in the pan, not that the pan or the unit itself has failed.
Ask for the pump to be powered directly before approving any ceiling access. If the motor is dead, the fix is one part, not a tear-out.

Questions this case answers

Water dripping from the ceiling near a concealed aircon: what fails first?

The drain pump, more often than not. A concealed unit sits flush in the ceiling so water cannot run downhill, and a small pump has to lift it to the discharge pipe. In this Bukit Timah landed home the pan held standing water close to overflow level, and the pump gave no response at all when powered.

Can a drain pump be changed without tearing out the ceiling?

Yes. Access here meant opening the ceiling void, lifting out the old pump and fitting a matching one in the same position. Nothing was cut away and the unit stayed where it sat. Ask for the pump to be powered directly before you approve any ceiling work, because a dead motor is a single part job.

What does A3 mean on a ceiling concealed Daikin?

It means water has backed up in the drain pan far enough to raise the water level switch, so the unit shuts itself down before the pan spills further. The code names the drain path, not the pan or the unit. Here the switch sat raised, the pan was full, and the pump motor would not turn.

How do I know whether the pan or the pump is at fault?

Feed power straight to the pump motor. A working motor spins, or at least hums. This one did neither, which settled it without touching anything else. The pan, the water level switch and the piping were all intact, so the job stayed at one part instead of becoming ceiling work.

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