What is a PowerJet aircon wash?
A high-pressure jet wash cleans an aircon's evaporator coil, blower fan and drain pan by driving a flat spray through the fins, flushing out slime that a wipe and low-pressure spray leave behind and rinsing out all cleaning residue. PowerJet is iAircon's version, with Viper's coil cleaner added when the coil needs it. Technique matters, because fins bend easily. Key takeaways
- It reaches deep into the coil: a fully flattened jet cleans through the fins, not just across the face.
- Gravity does part of the work: the coil is washed from the top down so loosened dirt flows out.
- The coil cleaner breaks down the slime: when a coil needs it, Viper's non-toxic heavy-duty coil cleaner is an add-on that tackles organic build-up without harsh chemicals.
- PowerJet is used at every level of cleaning: premium servicing, chemical wash and chemical overhaul all include it. In the video above you can watch one of our chemical wash jobs.
Why isn't a normal wipe and spray enough?
An evaporator coil is a block of thin metal fins packed closely together, with the refrigerant tubes running through them. In Singapore's humidity the coil is wet every time the aircon runs, so dust does not just sit on the front. It works its way deep between the fins, mixes with the condensed water and becomes a jelly-like biofilm. The blower fan has the same problem: dirt packs between the curved blades, where a quick spray in place cannot reach. Whatever is left behind keeps restricting airflow and growing mould.
Method | What it reaches | What it leaves behind |
|---|---|---|
Cloth wipe | The front face of the coil | Everything between the fins |
Low-pressure spray bottle | Wets the surface | Slime that is wetted but not moved |
Steam | The surface | Dirt pushed further into the coil, in Uncle Eric's view |
DIY foam can | The front of the coil | A coil that can end up choked |
| PowerJet high-pressure wash | Through the fins, blade by blade on the fan | Very little, with the residue rinsed out |
How does a PowerJet wash work?
- Protect the area. The wall and floor around the unit are covered and the dirty water is collected.
- Take out the removable parts. The blower fan and drain pan come out and are jet-washed separately, blade by blade and corner to corner.
- Flatten the jet. The spray is set as a flat fan rather than a single point. As Uncle Eric points out in our chemical overhaul videos, a fully flattened jet is what cleans through the fins.
- Wash top down. The coil is washed from the top downwards, so gravity carries the loosened dirt out rather than back into the coil.
- Rinse completely. Whatever cleaner is used, the high-pressure rinse flushes it out of the fins, so no residue is left to keep corroding the metal. You can watch: PowerJet washing a blower fan. Technique matters as much as pressure. Held too close or at the wrong angle, any jet can flatten the fins, so our technicians are trained to keep the spray flat and controlled.
Where does the coil cleaner fit in?
The slime in an aircon coil is mostly organic: dust, skin flakes, mould and bacteria. A coil cleaner breaks down that organic build-up without relying on harsh chemicals. When the build-up calls for it, we advise Viper's non-toxic heavy-duty evaporator coil cleaner on site, an add-on from S$30 per unit. Read when a very dirty coil needs the heavy-duty cleaner. The coil cleaner and PowerJet do different jobs. The cleaner loosens and breaks down the slime; the jet clears out what is left and restores airflow. In a chemical wash or overhaul, the coil chemical does the heavy lifting, and the PowerJet rinse is what makes sure none of it stays in the fins. Coil chemicals are alkaline or acid-based, and we use alkaline ones only in extreme conditions.
What difference does PowerJet make?
- Airflow and cooling come back. A clear coil lets air pass freely, so the room cools the way it should.
- Fewer smells. Removing slime from the coil, fan and drain pan takes away what the smell grows on. See why your aircon smells.
- Fewer leaks from clogged drain pans, because the pan is washed clean, not just wiped.
- A longer gap before deeper cleaning. Regular PowerJet servicing helps many units go much longer before they need a chemical overhaul.
- Safer chemical cleaning. A thorough rinse means coil chemical does not stay behind in the fins, one of the main differences we point out in cheap chemical wash deals.
Which services use PowerJet?
- Premium servicing: a PowerJet deep clean of the evaporator coil, plus the blower fan and drain pan taken out for a PowerJet wash, with the unit left on the wall. This is where most homes should start.
- Chemical wash: proper coil chemical loosens the dirt and grime on the coil, then a PowerJet deep clean flushes it out, with the unit on the wall. The blower fan and drain pan are taken out and PowerJet-washed back to as-new condition.
- Chemical overhaul: the unit is stripped and every part is PowerJet-washed inside out. We also use PowerJet on outdoor units that need it, at extra cost. If you are not sure which level your aircon needs, see chemical wash vs chemical overhaul. Every service comes with a 90-day warranty.
When to call a technician
- Cooling has dropped even though you wash the filters.
- There is a musty smell, or black spots on the blower fan.
- Water drips from the indoor unit.
- It has been more than three to six months since the last service.
- A previous "wash" did not make any difference. Book online in under a minute with instant confirmation, or ask Luna, our AI assistant, on WhatsApp any time, day or night.
Frequently asked questions
Is high-pressure water safe for the aircon coil fins?
Yes, with the right technique. The fins are thin and bend easily, so the jet is used as a flat spray that cleans through the fins rather than hammering them. That is a matter of training, which is why technique matters as much as the machine.
Does a PowerJet wash use chemicals?
PowerJet itself is water under high pressure. In premium servicing it gives the evaporator coil a deep clean and washes the blower fan and drain pan. In a chemical wash it follows the coil chemical, flushing the loosened grime and the chemical out of the fins, and washes the blower fan and drain pan. In an overhaul it rinses the coil chemical out completely. For a very dirty coil, we may advise a heavy-duty coil cleaner on site, an add-on from S$30.
Will a PowerJet wash make a mess in my room?
We protect the wall and the area around the unit before washing, and the dirty water is collected as we go. Parts such as the blower fan and drain pan are taken out and washed separately, usually in the bathroom, and we clean up afterwards.
Can PowerJet clean the outdoor unit as well?
Yes. We also use PowerJet on outdoor condensing units when they need it, at extra cost, which helps them release heat properly in Singapore's weather.
Eric Lim, aka Uncle EricFounder of iAircon.Repair, now in its 10th year servicing aircons in Singapore. Every job is filmed, so you can watch the work on YouTube.
