🔧 Vaillant Boiler Repairs in London
Expert Gas Safe Engineers for Efficient, Reliable Heating
When your Vaillant boiler develops a fault, you need an expert — not guesswork. At RARE Plumbing London, we specialise in diagnosing and repairing Vaillant boilers across Central London, whether you’re seeing an error code, losing heat, or hearing strange noises.
We work cleanly, efficiently, and with total professionalism — which is why we’re trusted in some of London’s most prestigious homes.
🛠️ Understanding Vaillant Boiler Faults
If your Vaillant boiler is showing a fault code, here’s what it might mean — and how we usually fix it:
F22 – Low Water Pressure
This is typically a system pressure issue. We’ll repressurise it safely, check for hidden leaks, and inspect the expansion vessel if needed.
F28 or F29 – Ignition Failure / Flame Loss
This indicates the boiler either couldn’t ignite or lost the flame. We’ll test the gas valve, ignition electrodes, and ensure there are no flue obstructions.
F75 – Pump or Pressure Sensor Issue
Often triggered after bleeding radiators. It means the boiler can’t detect water flow. We’ll resolve it by replacing the pump or pressure sensor and flushing the system if required.
We’ll test both components thoroughly. If either is failing, we’ll replace it using genuine Vaillant-approved parts.
F76 – Overheating of Heat Exchanger
Usually caused by scale or poor circulation. We’ll clean or replace the component and check for system blockages.
F83 – Temperature Gap Between Flow & Return
This usually means your water isn’t circulating correctly. We’ll bleed radiators, test the pump, and inspect the flow sensor.
F20 – Boiler Overheating
We’ll inspect your pump, check thermistors, and ensure your system isn’t struggling due to limescale or poor design.
F24 – Dry Fire / No Water Movement
This happens when the boiler isn’t moving water effectively. We’ll locate and fix seized pumps, airlocks or circulation issues.
💬 Don’t see your code? We’re happy to explain any fault and help you decide on the best course of action.
🔁 Our Vaillant Repair Services Cover:
- Emergency boiler diagnostics and fault repair
- Fixing low pressure, ignition issues, error codes
- Replacement of pumps, sensors, valves, and PCBs
- Repairs for smart controls including Vaillant vSMART
- Servicing of combi, system and regular Vaillant boilers
🔄 Is Your Boiler Beyond Economical Repair?
Sometimes, the most cost-effective fix… is a replacement. If your boiler is:
- Over 12–15 years old
- Repeatedly breaking down
- Showing signs of internal corrosion or scale
- Prone to multiple expensive part failures
We’ll be upfront with you.
Rather than applying temporary fixes, we’ll explain when a new boiler is the smarter choice — and recommend the right system for your home, usage and efficiency goals.
We offer:
- Expert Vaillant boiler installations across London
- Smart control upgrades (vSMART, Nest, Hive)
- Full system replacements with warranties up to 10 years
👉 Explore Vaillant Boiler Installation in London
📍 Where We Operate
We’re based in Central London and cover:
- Vaillant Boiler Repairs in Pimlico
- Vaillant Boiler Repairs in Marylebone
- Vaillant Boiler Repairs in Mayfair
- Vaillant Boiler Repairs in Belsize Park
- Vaillant Boiler Repairs in Primrose hill
🧰 Why Choose RARE Plumbing?
- Gas Safe registered engineers with real Vaillant experience
- Clean, respectful, and fully insured
- Genuine Vaillant parts stocked for quick turnarounds
- Honest advice — no upselling, just what’s right
- Trusted by landlords, managing agents, and homeowners alike
📞 Book Your Vaillant Boiler Repair
Don’t wait for your system to fail completely. Contact RARE Plumbing London for fast, knowledgeable, and fully guaranteed Vaillant boiler repairs in Central London.
