Vaillant Boiler Repairs
Vaillant is one of Europe's most respected boiler brands, known for quality engineering and reliability. But even a well-built boiler will develop faults over time. At Heat Cover, our engineers carry out Vaillant boiler repairs regularly across Kent and South East London — we know these systems well.
Whether your Vaillant boiler has stopped firing, is losing pressure, making unusual noises, or showing a fault code, we'll diagnose the problem accurately and carry out the repair using quality replacement parts. Most Vaillant repairs can be completed in a single visit.
We work on all Vaillant models including the ecoTEC Plus, ecoTEC Pro, ecoFIT Pure and older ranges. If your boiler is ageing, we'll give you an honest assessment of whether repair or replacement is the better option.
Vaillant Boiler Servicing
An annual service keeps your Vaillant boiler running safely and efficiently, and maintains any manufacturer warranty. During a service our Gas Safe engineer will inspect and clean all key components, check combustion and flue performance, test safety controls, look for leaks, and update the service record.
Vaillant boilers are well-built but still need regular attention from a qualified engineer. Annual servicing reduces the risk of unexpected breakdowns and catches developing faults early — before they become expensive repairs.
We offer flexible appointment slots. Landlords can rely on us for annual Gas Safety checks (CP12 certificates) across our service area.
Common Vaillant Boiler Faults
Vaillant boilers are well-regarded, but we regularly see the following faults across their range:
F.28 / F.29 Ignition Failure
One of the most common Vaillant fault codes. Caused by a faulty ignition electrode, spark lead, gas valve issue, or low gas pressure at the meter.
F.22 Low Water Pressure
Pressure drops below 0.5 bar, causing a lockout. Repressurising resolves it short-term, but recurring pressure loss indicates a leak or failing component.
F.75 Pressure Sensor Fault
The boiler can't detect the correct pressure. Often a faulty pressure sensor or pump — a common Vaillant ecoTEC fault.
No Hot Water
Heating works but no hot water. Typically caused by a failed diverter valve — a common wear part on Vaillant combi boilers.
Kettling / Banging
Noise from the heat exchanger caused by limescale — particularly common in the hard water areas of Kent and South East London.
F.61 / F.62 Gas Valve Fault
The boiler cannot properly control gas flow. Requires a gas valve inspection or replacement — a job for a Gas Safe engineer.
Why Choose Heat Cover for Your Vaillant Boiler?
Hands-On Vaillant Experience
We repair and service Vaillant boilers regularly across our area. Our engineers know the common faults and how to fix them efficiently.
Gas Safe Registered
All our engineers are fully Gas Safe registered. Only Gas Safe engineers are legally permitted to work on gas boilers in the UK.
Same-Day Response
We aim for same-day or next-day response to breakdown calls. Cover plan members receive priority booking.
Transparent Pricing
No hidden charges. We'll give you a clear quote before any work begins and stick to it.
Local & Independent
We cover Swanley, Dartford, Orpington, Bromley, Bexley and surrounding areas. You deal with us directly — not a national call centre.
Parts & Labour Cover
Cover plan members benefit from parts and labour included in their monthly fee — no unexpected bills.
Boiler Cover for Vaillant Boilers
Protect yourself from unexpected repair costs with one of our boiler cover plans. Cover starts from a low monthly fee and includes your annual service, unlimited callouts, and parts and labour for covered repairs.
Because our engineers already have hands-on Vaillant experience, any callout is handled by someone who genuinely knows your boiler. Cover plan members also get priority response and the reassurance that a large unexpected bill is never coming.
Areas We Cover
We carry out Vaillant boiler repairs and servicing across Kent and South East London, including: