My Saniflo Toilet Macerator Is Blocked Up

If the water level is high in the toilet bowl, remove as much water as possible with a bucket to prevent overflow. Leaks can occur if the macerator is full.

My Saniflo Has Cut Out Mid-Cycle Whilst Emptying

This could be due to the thermal cut-off activating because of hot water running through the unit. Let the motor cool down before restarting. Reduce hot water usage from washing machines or baths. If it continues to cut out, turn the pump off at the wall.

My Toilet, Shower, Bath, or Basin Is Full of Water Backed Up

This usually means the Saniflo system has an internal or waste pipe blockage. Empty as much water as you can to prevent leaks. Consider seeking professional assistance to clear the blockage.

My Saniflo Won’t Switch On, Off, or Keeps Running

Possible causes include a blockage, damaged membrane, missing non-return valve, or a broken switch. If it’s not blocked, replacing the switch and membrane may resolve the issue.

My Saniflo Sounds Like It’s Going to Take Off (Vibrating)

A foreign object might be caught in the macerator blades, causing vibrations. This is usually repairable.

My Saniflo Sanivite Has Problems & Smells Horrible

It may need a manual clean-out. Avoid using harsh chemicals.

My Saniflo Is Buzzing, Humming, or Jammed

This could be due to a blown capacitor, a jammed mechanism, or a failed motor. The first two issues are repairable; a motor replacement might be necessary for the third.

My Electrics Keep Tripping or Fusing Out

This can be due to loose wires or water ingress into the electrics. Turn off the power immediately and seek professional inspection and repairs.

My Saniflo Keeps Starting on Its Own Intermittently

Causes may include a leaking tap, damaged membrane, or faulty switch. Replacing the membrane and switch together can resolve the issue.

My Saniflo Box Is Hot

The motor may be jammed. Disconnect the power immediately. Do not attempt repairs yourself as water and electricity are involved.

My Saniflo Pump Won’t Switch On and Won’t Work

Check for a damaged membrane, broken internal float switch, or a blocked unit. If none of these, the motor may have failed.

Saniflo Leaking Through My Ceiling

This usually happens when the unit is overfilled, possibly due to flushing twice or an appliance connected to the system overflowing. Turn off the water supply immediately.

My Saniflo Leaks Out of the Air Vent

Excessive use of bleach can shrink internal seals, causing leaks. Alternatively, the unit may be packed with waste and require a thorough clean-out.

My New Large Drum Washing Machine Is Flooding the Saniflo

Large-capacity washing machines (9kg or more) may overwhelm the Saniflo if the outlet pipe size is too small. Ensure you have a 33mm (1.25 inch) waste pipe.

My Bathroom Saniflo Won’t Drain Out but Works with the Toilet Flush

Hair or debris may be clogging the inlet valve. Cleaning out the inlet valve can resolve the problem.

How Reliable Is a Saniflo?

With proper care, a Saniflo unit can last many years. Descale annually and avoid flushing foreign objects to prevent motor damage.

How Noisy Is a Saniflo?

Modern Saniflo models are quieter than older versions. The flushing sound of a standard toilet is usually louder than the Saniflo’s operation.

Restore Your Karcher Pressure Washer’s Power: High-Quality Replacement Capacitors

Is your Karcher pressure washer making a buzzing or humming noise when you try to switch it on, but nothing else happens? This frustrating issue is more common than you might think, and the good news is — it’s usually not a motor failure. In most cases, the buzzing sound points directly to a faulty motor start capacitor.

⚠️ What Does the Buzzing Noise Mean?

When you hear a buzzing or humming sound but the motor doesn’t turn over, it typically means that the power is reaching the motor, but the motor doesn’t have enough torque to start. This is a classic sign of a defective or worn-out capacitor. Instead of replacing the entire unit or paying for expensive repairs, you can often fix the problem by replacing the capacitor — a fast and affordable solution.

🔍 What Is a Capacitor and Why Does It Matter?

The capacitor is a small cylindrical component usually mounted on or near the motor. Its job is to provide the initial burst of energy needed to start the electric motor. Without it, the motor just hums in place — unable to start spinning. Capacitors can fail due to age, moisture, temperature changes, or long periods of disuse, especially during winter storage.

🛠️ Symptoms of a Faulty Karcher Pressure Washer Capacitor

Washer hums or buzzes when switched on but doesn’t start
Motor attempts to start but quickly stalls
You smell electrical heating or hear a faint “click” without activation
Sometimes starts if you manually turn the fan (not recommended)

If you notice any of these symptoms, it’s very likely the capacitor needs replacing. Capacitors are generally inexpensive and very easy to replace — even with basic DIY knowledge.

💡 Why Buy Capacitors from Doctor Spares?

At Doctor Spares, we specialise in genuine and high-quality compatible parts for Karcher pressure washers. Our capacitors are:

High-Quality and Durable: Built to meet or exceed OEM specifications for reliability
Compatible with Multiple Karcher Models: Including popular models like K2, K3, K4, K5, and K7
Available in Various Sizes: Including 12µF, 16µF, 20µF, 25µF, 32µF, 35µF, 40µF, and more
With or Without Cable: Choose the style that matches your machine
Quick to Fit: Simple installation process for most models

🧾 How to Find the Right Capacitor for Your Washer

To identify the correct replacement:

Locate the label on your existing capacitor (check µF and voltage rating)
Find your model number (usually printed on the body or base of your washer)
Use our product listings or search bar to match the correct part number

If you’re unsure, our customer service team is ready to assist you — just send us a message and we’ll help find the right match for your unit.

🚚 Fast Shipping, Trusted UK Supplier

We ship quickly throughout the UK, so you can get your pressure washer back in action without delays. We’ve helped thousands of customers get their equipment working again, and we’re confident we can help you too.

⭐ Customer Satisfaction Guaranteed

All of our products are backed by a no-hassle return policy. If the capacitor you purchase isn’t the right fit, we’ll help you find an alternative or offer a refund. Your satisfaction is our priority.

📈 Stop the Buzzing — Fix Your Pressure Washer Today

There’s no need to replace your entire pressure washer or spend a fortune on repairs. A simple capacitor replacement can restore your machine and save you time and money.

👉 Browse our full selection of Karcher pressure washer capacitors

We carry part numbers including 6.661-158.0, 6.661-288.0, 9.085-013.0, 90850130 and many others. Whether you need 25µF, 40µF, or a compact style with a mounting bolt or cable, we’ve got the right fit.

📦 Order Today and Get Back to Cleaning Tomorrow

Fast UK Shipping
Quality Assured Components
Friendly Customer Support
Trusted by Hundreds of DIYers and Professionals

Don’t let a small part cause a big problem. Replace your Karcher pressure washer capacitor today and enjoy powerful, reliable cleaning once again.