Cooling and dripping both worse after chemical servicing: bad reassembly
The aircon cooled well before the chemical servicing. After the visit, two faults appeared together: water dripped from the front and the airflow felt weaker. When one service visit causes two new problems at once, the cause is rarely a coincidence.
By Team Snowflake | Reviewed 3 Mar 2026
Case summary
Panasonic Wall-mounted5 years oldHDBSerangoon, Singapore
- Concern
- Unclear whether the wash had damaged something, or whether two parts had failed on their own at the same time
- Found
- Drain pan cover not reseated correctly after chemical servicing
- Key check
- Inspected internal unit assembly for anything disturbed or unseated during service
- Result
- The dripping stopped and the airflow returned to its pre-service strength. Both faults traced back to the reassembly, not to any damage from the wash itself.
What we were told
The aircon worked fine before the chemical servicing. Afterward, water dripped from the front and the cooling felt weaker. The servicing company was called back but insisted the work was done correctly.
What we checked
When two faults appear right after a service, the reassembly is the first place to look. We opened the indoor unit and checked every part that a chemical wash removes: the drain pan cover, blower wheel, filter frame, and housing clips. We looked for anything left out of position before testing refrigerant or wiring. The drip pattern was the first clue. Water came from the front-bottom edge, not the drain outlet, which meant it was being pushed forward rather than overflowing a full pan.
Water dripped from the front-bottom edge of the unit, not from the drain outlet.
The drain pan cover was not fully clipped on one side, loose enough to let water escape forward.
Drain water ran toward that front gap instead of flowing into the drain pipe.
The blower wheel sat slightly off-centre on its shaft, which cut the airflow.
What we found
Two reassembly steps were missed after the chemical wash. The drain pan cover has plastic clips that lock it flush against the coil housing. Leave one clip unclicked and a gap opens at the front edge. Drain water that should run back into the drain pipe instead leaks forward through that gap and drips from the front panel. The blower wheel was also refitted slightly off-centre on its shaft. An off-centre wheel pushes less air without the grinding noise a damaged part would make, so the airflow drops with no obvious warning. Both faults are easy to miss when the unit is closed up without a short test run to check drainage and airflow before leaving.
What fixed it
We reseated the drain pan cover and pressed each clip until it clicked into place. We then recentred the blower wheel on its shaft and checked that it spun without touching anything. No parts were needed. Both were undamaged, just put back wrong. We ran the unit for ten minutes and confirmed the dripping had stopped and the airflow was back to its pre-service level. We also showed the client where the clips sit, so they can check after any future chemical wash.
Outcome
The dripping stopped and the airflow returned to its pre-service strength. Both faults traced back to the reassembly, not to any damage from the wash itself.
What this case teaches us
Two new faults after one service usually point back to the work
- When water and weak airflow start right after a wash, suspect the reassembly before suspecting damage.
- A loose drain pan cover sends water out the front. An off-centre blower wheel quietly cuts airflow. Both were just refitted wrong.
- Tell us the service date and what changed. A part put back loose costs nothing to fix and needs no replacement.
Related reading
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