Whole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents
That "$99 whole-house special" is a bait ad - the real number appears once they are in your hallway, or the "clean" is a shop-vac at the register. We photograph the inside of your ducts before and after instead.
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AfterRotobrush Coil Cleaning: The Los Angeles Owner’s Guide
Most Rotobrush owners in Los Angeles discover their coil cleaning system has failed when the vacuum suddenly loses suction mid-job or the brush head stops spinning under load. We stock Rotobrush-compatible coil cleaning components on our service trucks across the LA basin, and a typical coil cleaning system diagnosis and repair runs between $95 and $240 installed, depending on what’s actually worn. The fix usually happens same-day once we’ve opened the unit and confirmed which part gave out.
The frustrating part for most owners is that the failure rarely announces itself. You’ll be working through a duct run in a 1950s Mid-Wilshire home or a newer build out in Chatsworth, and the machine just loses its bite. We hear it described as “the suction went soft” or “the brush stopped grabbing.” What’s actually happening is almost always one of three things: the coil has gummed up with fine LA dust until it can’t flex properly, the coil’s drive coupling has worn smooth, or the foam collar that seals the coil to the brush shaft has broken down. Paul Adeyemi has seen hundreds of these exact failures, and the diagnosis typically takes him under ten minutes once the unit is on the bench.
Before we start, let me show you exactly what we found and exactly what it will cost to fix it.
Key Takeaways:
- We stock Rotobrush-compatible coil cleaning parts on our Los Angeles service trucks, not in a warehouse two states away.
- Installed pricing runs $95 to $240 depending on whether it’s a clean-and-lubricate, a coil replacement, or a coupling swap.
- OEM Rotobrush coils and quality aftermarket equivalents are both available; we’ll show you the difference before you pay for either.
- Diagnosis takes about 10 minutes once the unit is open, and most repairs are done same-day.
Which Rotobrush Models This Applies To
If you’re running a Rotobrush aiR+ or the older Rotobrush 550/650 series, the coil cleaning assembly is the heart of the machine’s agitation system. The coil itself is the spiral brush that feeds into the vacuum head, and it’s matched to the unit by shaft diameter and coil pitch. Get the pitch wrong and the brush either rides over debris instead of lifting it, or binds against the duct wall. This is the single most common compatibility mistake we see when a Los Angeles owner tries to source a coil on their own.
On the aiR+ series, Rotobrush uses a quick-connect coupling that’s proprietary in shape. A generic coil from a plumbing supply house won’t seat correctly, no matter how close the diameter looks. On the 550/650 series, the coupling is a simple square drive, which means a quality aftermarket coil can work well, provided the coil pitch matches the factory spec. We keep both OEM Rotobrush coils and the aftermarket equivalents we’ve tested and trusted on our trucks, and we’ll tell you honestly which makes sense for your unit and how you actually use it.
One thing worth knowing that most online parts listings won’t tell you: Rotobrush has changed coil material composition twice in the last decade. The current coils use a polypropylene blend that holds its shape better in heat, which matters in Los Angeles because a service van interior in July can hit 130 degrees before you even start the job. Older nylon coils left sitting in that heat develop a permanent bend, which is why so many older units we open up in LA have coils that look more like a corkscrew than a spiral.
Signs Your Rotobrush Coil Cleaning Is Failing
- Suction drops off noticeably mid-run. The vacuum motor is still sounding strong, but the coil isn’t agitating debris up into the air stream. The coil has either worn down in diameter from thousands of duct-feet of contact, or the coupling is slipping under rotational load.
- The brush head thumps or chatters inside the duct. This is almost always a bent coil. It happens when the coil was stored coiled too tightly or left leaning against something heavy in the van. Once bent, it creates an imbalance that you’ll feel in the handle and hear in the duct.
- You see black or gray dust on the coil when you pull it out even after cleaning. The coil material has lost its static-dissipating surface and is now holding fine particulate instead of releasing it into the vacuum stream. Time for a new coil, not a cleaning.
- The coupling spins but the coil doesn’t, or it catches intermittently. The drive square has rounded over. On the aiR+ quick-connect, this usually means the retaining clip has failed. In either case, the coupling needs replacement, not just tightening.
- Visible cracking or flattening at the coil base where it meets the shaft. This is heat and age. Los Angeles service vans and unconditioned garages do this to coils faster than anywhere we’ve worked. Once the base cracks, the coil will eventually separate from the shaft entirely, often inside a customer’s duct.
Replacement Cost & What’s Included
In Los Angeles, a Rotobrush coil cleaning system repair at Morton’s runs $95 to $240 installed. Here’s the honest breakdown of what drives that range:
- Coil clean, lubricate, and re-seat: $95 to $120. This covers a full disassembly of the coil assembly, solvent cleaning of the coil and coupling, lubrication of the drive connection, and a test spin under load.
- Aftermarket coil replacement: $140 to $180 including the coil, the labor to install it, and adjustment of the coupling if needed.
- OEM Rotobrush coil replacement with new coupling: $190 to $240. We replace the coil and coupling as a set so you’re not back in six months for the coupling half of the same failure.
Every one of those prices is a written number you’ll see before we touch the machine. No surprise line items after the fact. The work carries our 365-Day Done Right Promise, which means if the coil doesn’t perform right within a year of the repair, we make it right at no charge. That’s not a limited-time offer; it’s stamped on every job we do.
DIY or Call Us?
This is a low-voltage mechanical part, so your safety risk in attempting the swap yourself is minimal compared to, say, a dryer vent replacement. The real risk is a mismatched coil chewing up a customer’s duct interior or a coupling that lets go mid-job. If you have calipers and you’re confident reading the coil pitch against the old part, a careful owner can do this on the 550/650 series with an aftermarket coil. On the aiR+ series with the quick-connect coupling, the proprietary seating means you’re likely to damage the new coil on installation, which voids most seller warranties.
Our honest recommendation: if you have the coil out and the old one in hand, and you want to try it, we’ll tell you what to measure before you order anything. But if the unit is down and you’ve got jobs booked this week, call us at (323) 918-4345. We’ll have it diagnosed and back on the truck the same day in most cases.
FAQs
In our experience across LA County, a coil used weekly lasts 18 to 30 months before heat degradation or material wear takes it out, while a coil in a unit that sits in an unconditioned van and gets used monthly may last only 12 to 18 months. The Los Angeles heat, particularly the interior temperature of a parked service vehicle, is the factor most owners underestimate. Call (323) 918-4345 if you suspect your coil is heat-damaged; we can tell you in minutes once it’s on the bench.
In most cases, no. A bent coil can sometimes be gently straightened enough to get through a job, but the material fatigue is permanent and the imbalance will return. Chemical softening of the coil base is not worth attempting; the plastic has degraded. We will always show you the specific failure before recommending replacement, and we’ll never sell a coil when a cleaning would have solved the problem.
For the 550/650 series, we typically complete a coil and coupling replacement in about 45 minutes. The aiR+ series with the quick-connect coupling takes a bit longer because of the seating and alignment, usually about an hour. Both are same-day jobs, and we can do the work at your location anywhere in the Los Angeles area or at our shop. Call (323) 918-4345 and we’ll give you an honest time estimate before we schedule anything.
We keep Rotobrush-compatible coils, couplings, and the related coil cleaning components on our service vehicles. That means when we show up, the part is already there, not ordered after the diagnosis. We also hold compatible parts for Lennox, Trane, and Carrier air handling units for the air duct side of the work.
No. Morton’s Air Duct Cleaning is an independent Los Angeles service provider, not associated with Rotobrush. We use Rotobrush equipment in our own duct cleaning work, which means we know the machines from daily use, and we source both OEM Rotobrush parts and aftermarket equivalents we’ve personally tested.
Call Us for a Straight Answer
If your Rotobrush coil is down and you want to know what it’ll cost to get it right, call Paul and the team at Morton’s Air Duct Cleaning at (323) 918-4345. You’ll get a live person on the phone, a written price before any work starts, and a photo of the finished job before we pack up. We serve all of Los Angeles and the surrounding basin, and our technicians show up in uniform with shoe covers and drop cloths for any work inside your home.
Written by Paul Adeyemi, Owner, Morton’s Air Duct Cleaning at Morton’s Air Duct Cleaning, serving Los Angeles and nearby areas.