At HBR Heating Services, we are a team of expert Vaillant specialists based in South London. We specialise in Vaillant boiler repairs, servicing and installations, from older ecoMAX units to the latest ecoTEC Plus and ecoFIT Pure models. Our qualified engineers are well-versed in these boilers and can diagnose and fix any issues quickly and reliably. If your Vaillant has lost pressure, is showing fault codes, or isn’t heating your home properly, we can get you back up and running in no time.
Why choose HBR Heating Services?
* Vaillant advanced
Vaillant is our choice of boiler manufacturer, so we know them inside out.
* Rapid response
We attend quickly to restore your heating and hot water, with over 30 years knowledge.
* Genuine Vaillant parts
We only use genuine Vaillant products, ensuring long-term reliability.
* Advanced diagnostics
Using official Vaillant software for precision fault-finding.
* Transparent Pricing
Clear, upfront quotes with no hidden extras.
Common Vaillant boiler faults & possible issues
Vaillant boilers are known for their reliability, but like any appliance, they can develop faults over time. Below are the most frequent error codes and symptoms we deal with, along with the possible issues behind them:
F.22 error – low water pressure
The boiler detects low system pressure and shuts down for safety.
Possible issues: leaks in the heating system (radiators, joints or valves). A faulty pressure relief valve (PRV) releasing water. Expansion vessel losing its charge or diaphragm failure.
F.28/F.29 – ignition failure
This fault indicates that the boiler is trying to ignite but fails (F.28) or the flame cuts out during operation (F.29).
Possible issues: blocked or faulty ignition electrodes, a weak or disrupted gas supply, frozen or blocked condensate pipe, flue restriction or unsafe flue, or a faulty gas valve or PCB.
Hot water but no heating (or vice versa)
This fault indicates that either the taps run hot but the radiators stay cold, or the reverse.
Possible issues: a stuck or faulty diverter valve (very common on Vaillant combis), a faulty thermostat or central heating controls, airlocks or blockages in the heating system, or a failed plate heat exchanger.
Boiler losing pressure overnight
This fault indicates that the boiler’s pressure keeps dropping to zero despite topping up.
Possible issues: leaks under flooring, behind walls or in pipework, a faulty PRV allowing water loss, a failed or flat expansion vessel, or micro-leaks that only appear under system pressure.
Strange noises – kettling, banging, gurgling
This fault indicates that the boiler sounds like a kettle boiling, whistles or bangs when running.
Possible issues: limescale build-up on the heat exchanger (especially in hard water areas), sludge or debris restricting water flow, air trapped in the system, or a failing or noisy circulation pump.
F.75 fault – pump or pressure sensor issue
This fault indicates that the boiler cannot detect pressure changes when the pump is running.
Possible issues: a faulty pump or pressure sensor, seized or failing circulation pump, blocked or faulty pressure sensor or sludge build-up preventing correct circulation.
Other common Vaillant faults we repair
• F.20 – overheating: caused by blocked circulation or faulty sensors.
• F.24 – dry fire / no water: system empty, airlocked or pump failure.
• F.27 – flame detection fault: moisture damage, faulty electrodes or PCB error.
• F.32 – fan fault: fan seized, loose wiring or flue restriction.
• F.61 / F.62 – gas valve fault: faulty gas valve, wiring issues or PCB communication failure.
• F.72 – flow/return sensor error: inconsistent sensor readings or wiring issues.
• Frozen condensate pipes: common in winter, stopping boiler ignition.
• Leaking boilers: from seals, heat exchangers or auto air vents.
• Uneven heating: radiators hot at bottom but cold at top due to air or sludge.
• Intermittent heating/hot water: often linked to failing PCB or weak sensors.
Our repair process
1. Initial inspection – full visual/physical check of boiler and system.
2. Diagnostics – combining years of knowledge and the latest hardware to identify the exact fault.
3. Safety checks – expansion vessel, flow rates, pressures and flue safety.
4. Repairs & replacements – only genuine Vaillant parts fitted, 90% on the same day.
5. System protection – check inhibitor levels, strainers and filters.
6. Final testing – heating and hot water tested.
7. Digital service report – detailed record of work, with photos if required.
Vaillant models we maintain
We repair, service and install all of the Vaillant range, including:
• ecoTEC Plus (24, 28, 30, 32, 35, 37, 43)
• ecoTEC Pro
• ecoFIT Pure
• ecoTEC Exclusive with Green iQ
• ecoMAX & older models still in circulation, turbo max etc
Protecting your Vaillant boiler after a repair
To keep your boiler reliable and efficient, we recommend:
• Annual servicing (essential for warranty)
• System cleansing & powerflushing
• Magnetic filter installation
• Inhibitor top-ups
• Smart heating controls: Vaillant vSMART, Hive, etc.
Emergency Vaillant boiler repairs
Sudden breakdown? No hot water, no heating, or leaking boiler? Our team responds quickly to restore comfort and safety in your home.
Why homeowners trust HBR Heating Services
• Local trusted engineers
• Vaillant advance expertise
• Fast, reliable and friendly service
• Clear communication & fair pricing
• Fully qualified and insured
Book your Vaillant boiler repair
Don’t wait for a minor issue to become a major problem. Contact HBR Heating Services today for fast call-outs, expert diagnostics and long-lasting repairs for your Vaillant boiler. Our boiler servicing options:
Basic service: this annual inspection is ideal for landlords seeking a straightforward service.
– It covers essential safety checks and appliance testing.
– This ensures your warranty remains valid if required.
– Our engineers inspect the boiler and advise on any visible issues.
Full service: our full service is a thorough, in-depth boiler service designed for maximum efficiency and reliability. It also includes your actual heating system, which your boiler heats.
– It includes a full internal inspection and cleaning of the main heat exchanger.
– The boiler is drained locally, components inspected and cleaned.
– Worn flue seals are replaced and burner door seals are installed.
– If parts are identified and suggested to the customer on-site, where necessary and possible, they are replaced there and then.
This ensures your boiler stays in condition for the upcoming season.
We are committed to providing honest, reliable boiler servicing – not just ‘box-ticking’. With us, you’ll always know exactly what’s been done and why.
Why choose HBR Heating Services for your Vaillant boiler?
Vaillant boilers are renowned for their quality and efficiency, but even the best systems require professional attention to maintain their top condition. Whether you’re experiencing a boiler breakdown, error codes, or simply need routine servicing to extend your warranty, HBR Heating Services is your local Vaillant expert.
HBR Heating Services offers a range of services to ensure your Vaillant boiler is in top shape:
Serving homes and businesses across South London, our engineers cover all areas including Clapham, Brixton, Balham, Tooting, Wimbledon, Streatham, Dulwich, Croydon and nearby neighbourhoods. We take pride in being a trusted Vaillant service provider, offering competitive pricing, transparent communication and a friendly, professional approach.
With 30 years of experience and Gas Safe registration, we ensure your safety. All our engineers are well-experienced, fully qualified and Gas Safe registered, equipped to work on all Vaillant boilers, whether combi, system or conventional. We only use genuine Vaillant parts and follow manufacturer guidelines to ensure reliable, safe and efficient performance.
Don’t let the cold set in – keep your Vaillant boiler in peak condition with HBR Heating Services. Book your Vaillant boiler service or repair today.
Call HBR Heating Services today on 0208 1111 427.
