Does the cleaning include the drain pan and hose? I hear that's the dirtiest part
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I read somewhere that the condensate pan is the dirtiest part of the unit. Mine (9,000 BTU Samsung, bedroom, Aviației, 5 years old) does not drip and does not smell much, but I want to know whether a cleaning reaches there too or only the fins.
What is really happening
Measurements on household splits found about 12,300 CFU/cm² in the condensate pan, over 20 times the limit for public spaces – it is the spot with standing water, at room temperature, in the dark. Its sludge (biofilm + dust) slides into the hose and narrows it; when it gives way, water comes out through the louvres. EPA guidance requires clean pans and free drains as a basic anti-mould measure. A unit that 'does not drip yet' is not one with a clean pan; it is one whose hose still copes.
- The area and sensitive components are protected before work.
- The cover collects wash water.
- The hose directs water into a container.
- The condensate pan of household units had the highest bacterial load (~12,300 CFU/cm²), over 20 times the 500 CFU/cm² limit for public spaces. [Frontiers in Public Health / PubMed Cent, 2024]
- EPA requires condensate pans to be clean and drain lines unobstructed; standing water must be fixed immediately. [US EPA, 2024]
- WHO: microorganisms can grow in cooling coils and drip pans, causing respiratory symptoms; all surfaces of an air-handling system must be kept clean. [WHO / NCBI Bookshelf, 2009]
- Washing with alkaline detergent, brushing and high-pressure rinsing reduces fungi inside the unit by more than 99%. [Indoor Air, 2023]
What we do on site
- Torch inspection of the pan (visible once the cover is off); we photograph.
- Sealed double cover, hose to the bucket, foil on the bed.
- Alkaline detergent on evaporator, roller and in the pan – the pan gets a longer contact time for the sludge.
- Adjustable pressure wash of evaporator and roller; then the jet straight into the pan, along its full length, the drain mouth last.
- We push clean water through the condensate hose until it runs clear on the balcony; if the hose is partly blocked it shows immediately and we clear it with water, not air.
- Sanitising on evaporator, roller and pan; filters; outdoor unit washed in place; drain test on 'Cool'. See current rates on the Prices page.
What you can do yourself
- At the start of summer, check the drip at the hose end after 20 minutes of 'Cool'.
- Do not leave the outdoor hose end stuck in a bottle or in soil – it must run free.
What NOT to do
- Do not pour bleach or vinegar into the pan – corrosive and does not remove sludge.
- Do not blow with a compressor from outside.
Prevention
Pan and hose flushed yearly – a bedroom with 8 hours of condensation a night is exactly the case.
When to call us
0764 012 943, WhatsApp, Monday–Saturday 08:00–20:00; Aviației is close.
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The information on this page is educational and based on cited sources; it does not replace medical advice. We do not do repairs, installation or refrigerant circuit work.