Boiler Repair & Servicing

Boiler Repair and Servicing in Kent and South East London

Specialist Diagnosis. Same-Day Repairs. Manufacturer-Trained Engineers.

Call 01474 632 158 Book a Service

Faster Diagnosis. Fewer Return Visits. Boilers Only.

When your boiler stops working or starts behaving unreliably, you need an engineer who knows boilers inside out — not a generalist tradesperson who will work through possibilities until something sticks. BoilerSense engineers work exclusively on boilers. That focused expertise means faster diagnosis, fewer return visits, and a higher rate of same-day fixes.

We repair and service all major brands across Kent and South East London, including Worcester Bosch, Vaillant, Baxi, and Ideal. Our engineers carry a comprehensive stock of common replacement parts — the majority of faults are resolved in a single visit without a parts-ordering delay.

For urgent repairs, call 01474 632 158 now
Same-Day Repairs Most faults fixed in one visit
Fast Diagnosis Boiler-only expertise means faster fixes
Fixed Price £95 Diagnostic callout, quoted before repair
Annual Service £85 Full inspection, combustion analysis
Gas Safe Registered All work certified
All Major Brands Worcester Bosch, Vaillant, Baxi, Ideal

Common Boiler Faults We Repair

Most breakdowns are caused by a relatively small set of component failures that our engineers diagnose and fix every day.

No Heating or Hot Water

The most frequent complaint. Could be a faulty diverter valve, failed pump, motorised valve fault, or PCB issue. Our engineers identify the root cause rather than replacing components speculatively. Most resolved same-day.

Loss of Pressure

If pressure drops repeatedly after represurising, there is likely a leak — a radiator valve, pump seal, or hairline crack in a heat exchanger. Finding the source of a slow pressure loss is where focused boiler expertise makes the difference.

Boiler Leaking Water

Common causes include a failed pressure relief valve, worn pump seal, cracked heat exchanger, or loose pipe connections. We identify the source and advise whether repair or replacement is the right course of action.

Ignition Failure / Won't Light

If your boiler attempts to fire and then locks out, the cause is typically a faulty ignition lead, failed gas valve, or flame sensor that needs cleaning. Straightforward repairs for an experienced boiler engineer.

Kettling and Banging Noises

A boiler making rumbling, banging, or kettling sounds is usually reacting to limescale or sludge on the heat exchanger. A power flush and inhibitor treatment addresses most cases; severe cases may require heat exchanger replacement.

Frozen Condensate Pipe

In cold weather, the condensate pipe can freeze, causing the boiler to lock out. We defrost the pipe and, where appropriate, insulate it to prevent recurrence. Common in very cold winters across the Kent and SE London area.

Common Boiler Fault Codes We Address

Vaillant F.28 — ignition fault F.29 — flame failure F.75 — pressure sensor fault
Worcester Bosch EA 227 — ignition fault 224 — gas valve fault 1022 — fan fault
Ideal F1 — no ignition L2 — overheating H.07 — low pressure
Baxi E168 — ignition fault E119 — pressure fault

How We Approach Boiler Repairs

Transparent, fixed-price repairs — no surprises once the engineer is at your home.

You call us

Tell us the fault, make, and model of your boiler. We advise on likely cause and same-day availability.

Engineer visits

Your Gas Safe registered BoilerSense engineer arrives at the agreed time with a comprehensive van stock of common parts.

Diagnosis

Full diagnostic check, tests components, identifies the root cause. No guesswork — methodical and manufacturer-informed.

Fixed-price quote

Before starting any repair, we give you a written quote. You approve it before we proceed. No surprises.

Repair carried out

Most repairs completed in the same visit. We carry diverter valves, PRVs, ignition leads, flame sensors, pump heads, and PCBs for common models.

Tested and certified

After repair, the system is fully tested and any Gas Safe documentation is issued. We do not leave until everything is confirmed working.

BoilerSense engineer diagnosing a boiler fault in a customer's home

Annual Boiler Servicing — Why It Matters

Annual servicing is not an optional luxury. It is the single most important maintenance step you can take for your boiler's longevity, efficiency, and safety.

Safety

A boiler in poor condition can leak carbon monoxide — a colourless, odourless gas that can cause death. An annual service includes a carbon monoxide check and verifies that the flue and combustion system are operating safely.

Efficiency

A poorly maintained boiler burns more gas to produce the same heat. A clean, properly calibrated boiler costs less to run. Many homeowners find that an annual service improves boiler response and reduces energy costs.

Warranty Protection

Almost every boiler manufacturer requires annual servicing as a condition of the warranty. If your boiler develops a fault within the warranty period and there is no service history, the manufacturer may refuse the claim. A BoilerSense service produces a signed service record that protects your warranty.

Early Problem Detection

A trained engineer checking your boiler annually will spot developing problems — worn seals, marginal gas pressure, a heat exchanger showing early signs of corrosion — before they cause a breakdown. Preventive maintenance is almost always cheaper than emergency repairs.

What a BoilerSense Annual Service Includes

Visual inspection of the boiler casing and condition
Flue and ventilation check — correct installation, no obstruction or damage
Combustion analysis — measuring CO₂ and CO levels in flue gas
Heat exchanger inspection — cleaned and checked for leaks or sooting
Burner inspection and cleaning
Ignition system check — leads, electrodes, and flame sensing
Gas pressure test — inlet and working pressure within manufacturer specification
Safety device checks — overheat thermostat, pressure relief valve, auto air vent
Seals and gaskets — inspected and replaced where worn
Controls check — programmer, room thermostat, and zone valves
Service record completed and signed — protects your manufacturer warranty

A BoilerSense service takes approximately one hour and is carried out by a Gas Safe registered engineer with manufacturer training on your specific boiler brand. From £85.

What Our Repair Customers Say

"Our boiler kept losing pressure and two other companies couldn't find the fault. BoilerSense diagnosed a hairline crack in the heat exchanger within 30 minutes. The diagnosis was clear and the quote was fair. Fixed the same day."

David H., Woolwich

Google Review

"Called at 7am with no hot water and they had an engineer out by 10am. Fixed a faulty diverter valve and we had heating again by lunchtime. Brilliant service."

James T., Dartford

Google Review

Book a Repair or Annual Service Today

For urgent repairs, call now. For annual servicing, use the same number or email us to agree a convenient time.

01474 632 158
Call for a Same-Day Repair Book an Annual Service

Or email enquiries@boilersense.co.uk — lines open 7 days a week.

Frequently Asked Questions — Boiler Repair and Servicing

Most boiler repairs fall between £95 and £350, depending on the nature of the fault and the parts required. Simple repairs such as a frozen condensate pipe or a repressurise and leak check are at the lower end. Component replacements — diverter valves, pumps, PCBs — typically cost £150–£350 parts and labour. We will always quote a fixed price before starting any repair.
In the majority of cases, yes. We carry common parts on our vehicles and aim to complete repairs in a single visit. For less common parts, we may need to return the following day. Call 01474 632 158 and we will advise on current availability and whether your fault is likely to be a same-visit fix.
Once a year. Annual servicing is recommended by all manufacturers, required by most warranties, and legally required for landlords' rental properties. If your boiler has not been serviced for two or more years, we recommend a full service before the next heating season.
Annual boiler services in Kent typically cost £80–£120. BoilerSense services start from £85 for a standard domestic combi boiler.
Almost certainly yes. Manufacturer warranties on Worcester Bosch, Vaillant, Baxi, and Ideal boilers all require annual servicing as a condition of the warranty. Without a service record, a warranty claim for a fault can be refused. We issue a signed service record after every service.
It depends on the cost of the repair and the boiler's overall condition. A single modest repair on a 12-year-old boiler in otherwise good condition is usually worth making. If you are spending more than 50% of a new boiler's cost on repairs within a short period, or the boiler is showing multiple failures, replacement is usually more economical. We will always give you an honest comparison.
We charge a fixed diagnostic fee of £95 which covers the engineer's visit and fault diagnosis. We will tell you this fee when you call and before we dispatch an engineer. We do not charge hidden fees on top once the engineer arrives. All repair work is quoted separately before it begins.