Aircon Worse After Servicing

Case Details

What We Checked

• Water dripping from the front-bottom edge of the unit, not from the drain outlet.
• Drain pan cover not fully clipped on one side — sitting loose enough to allow water forward.
• Condensate running toward the front gap instead of channelling to the drain pipe.
• Blower wheel slightly off-centre on the shaft, reducing airflow volume.

The Diagnosis

Two reassembly steps were missed after the chemical wash. The drain pan cover has plastic clips that lock it flush against the evaporator housing — if even one clip is left unengaged, a gap forms at the front edge. Condensate that would normally flow rearward into the drain pipe instead runs forward through that gap and drips from the front panel. Separately, the blower wheel was refitted slightly off-centre on its shaft. An off-centre wheel creates uneven air resistance, reducing total airflow volume without producing the grinding noise you would expect from a damaged part. Both are easy to overlook when the unit is closed up without running it for five minutes to verify drainage and airflow before leaving.

What Fixed It

We reseated the drain pan cover and pressed each clip until it engaged audibly. Then we repositioned the blower wheel on the shaft, centering it and confirming it spun without contact. No parts were needed — both components were undamaged, just not put back correctly. We ran the unit for ten minutes after reassembly to verify the dripping had stopped and the airflow was back to its pre-service level. We also showed the client where the clips are located so they could check after any future chemical wash.

The dripping stopped and airflow returned to its pre-service strength. Both problems traced to reassembly, not to any damage from the wash itself.

Why This Happens

Two symptoms after one service — check the reassembly.

• When dripping and weak airflow appear together after a wash, both usually trace to reassembly steps. The drain pan cover and blower wheel are removed and refitted during chemical cleaning — two separate steps that can each go wrong independently.
• A drain pan cover that is not fully clipped redirects condensate toward the front panel instead of the drain pipe. It sits in place by gravity alone, so it looks correct even when the clips have not engaged. Ask your technician to press along the front edge until each clip clicks before closing the unit.
• A blower wheel slightly off-centre reduces airflow without making obvious noise — it just feels weaker. Checking that it spins freely and sits centred on the shaft takes only a moment, but is often skipped when the technician is in a hurry.
• The simplest safeguard is a post-service run test. Run the unit for five minutes after reassembly and check for dripping, airflow strength, and any unusual vibration before the technician leaves.