
Why Choose Us To Repair Your Boiler?
Trusting your boiler repairs to an experienced professional is essential, and Thames Boilers brings over 25 years of expertise to every job. Since becoming Gas Safe registered in 2002, we’ve diagnosed and fixed countless boiler issues across Kent, building a reputation for reliable, honest service.
Here’s what sets our boiler repair service apart:
- We’re skilled at repairing most major domestic boiler brands, from Worcester Bosch to Vaillant
- We give honest advice about whether repair or replacement is more cost-effective
- Our parts come with a 12-month guarantee for your peace of mind
Whether you’ve got a combi, system, or heat-only boiler, we’ve got the expertise to get it running again.
And while we can’t offer free quotes, our diagnostic visits will give you a clear picture of what’s wrong and how much it’ll cost to fix.
Boiler Repairs Questions & Answers
How much will it cost to fix my boiler?
Understanding boiler repair costs can be tricky since they vary considerably based on the problem. The simplest repairs might only need an hour of our time with no parts required, so you’ll just pay for the labour.
As a Gas Safe registered company with 25 years of experience, we’ve seen nearly every boiler issue imaginable. But when things get more complex, like replacing major components, the costs can add up.
For instance, if your boiler needs a new pump, fan, or circuit board, you’re looking at both parts (ranging from £150 to £350) and possibly 2-3 hours of labour. These bigger jobs naturally cost more, but we’ll always be upfront about what you’re paying for.
We won’t sugar-coat it – boiler repairs aren’t cheap, but they’re essential for keeping your home warm and comfortable.
Here’s what we can promise: we’ll diagnose the issue during our initial visit and give you a clear estimate before proceeding with any repairs.
While we can’t offer free quotes (diagnosis is skilled work that takes time), we’ll always provide honest advice about whether a repair is worth it or if you might be better off considering a replacement.
How quickly can I get a boiler repair appointment?
Response times for boiler repairs typically depend on the season and our current workload.
During the warmer months, when fewer people are using their heating systems, we can usually get to you within a day or two of booking. It’s much easier to schedule quick appointments when the sun is shining!
However, things get considerably busier during the colder months. As you might expect, that’s when most boilers decide to act up! During autumn and winter, you may need to wait a couple of weeks for an available slot in our schedule. It’s understood that that’s not ideal when you’re feeling chilly, but we’re always honest about our timeframes.
The good news is that we’ve made booking super convenient with our online system. You can check our real-time availability and book your preferred slot 24/7 through our website at booking.thamesboilers.co.uk.
While we’d love to get to everyone immediately, working safely and thoroughly is our priority. Rest assured, once we’re at your property, we’ll give your boiler repair our complete attention and expertise to get your heating back up and running.
What guarantees do you offer on boiler repairs?
Boiler repair guarantees at Thames Boilers cover replaced parts for 12 months after installation. If any part we’ve installed fails during this period, we’ll replace it completely free of charge, giving you peace of mind about your repair investment.
It’s important to understand what our guarantee does and doesn’t include, though. While we stand firmly behind the quality of our replacement parts, we can’t extend the guarantee to other components of your boiler or heating system.
For example, if we replace your pump and it fails within 12 months, we’ll sort that out at no cost to you. However, if your fan breaks down three months after we’ve fixed your pump, that would require a separate repair visit and charge.
We believe in being upfront about our guarantees because transparency builds trust. When we repair your boiler, we’ll clearly explain which parts we’re replacing and how the guarantee applies to your specific situation.
This way, you’ll know exactly what’s covered and can make informed decisions about your boiler repairs.
Should I book a boiler service or a repair?
Let’s clear up any confusion about these two different types of appointments.
If your boiler isn’t working properly – maybe it’s not heating up, making strange noises, or losing pressure – you’ll want to book a repair visit.
Think of it like going to the doctor when you’re sick; something’s wrong, and you need it fixed. During a repair visit, we’ll diagnose the problem and get your boiler back up and running.
A boiler service, on the other hand, is more like an annual health check-up.
It’s routine maintenance that helps prevent future problems and keeps your boiler running efficiently.
However, if your boiler’s already acting up, a service won’t solve these existing issues.
You wouldn’t go for a check-up when you’ve got a broken arm, right? The same principle applies here.
For any current boiler problems, always book a repair visit rather than a service.
Are you gas safe registered?
As a registered Gas Safe engineer since 2002, we take pride in maintaining full compliance with all safety regulations and industry standards.
Our Gas Safe registration isn’t just a piece of paper – it’s your guarantee that we’re legally qualified and regularly assessed to work safely with gas appliances in your home.
All gas engineers must maintain updated credentials and undergo periodic assessments to guarantee the highest safety standards are met.
You might wonder why Gas Safe registration is such a big deal.
Well, working with gas can be dangerous if not done properly, and that’s why it’s actually illegal for anyone who isn’t Gas Safe registered to work on gas appliances.
Before we start any job, we’ll happily show you our Gas Safe ID card, which proves we’re authorised to work on domestic gas boilers and heating systems.
The Gas Safe Register replaced CORGI in 2009 as the official gas registration body for the UK, and we’ve stayed current with all training and certifications since then.
We believe in being completely transparent about our qualifications because your family’s safety is our top priority.
You can verify our registration anytime by checking the official Gas Safe Register website.
What payment methods do you accept?
We accept various payment methods, including cash, credit/debit cards, and bank transfers, making it convenient for you to pay for your boiler repair.

Boilers We Can Repair
At Thames Boilers, we’re experts at repairing all major domestic gas boiler brands, including Vaillant, Worcester Bosch, Glow Worm, and Viessmann.
We’ve got years of experience working with combi boilers, which are the most common type found in Kent homes.
Whether your boiler’s making strange noises, losing pressure, or just not working right, our Gas Safe registered engineers will diagnose and fix the problem quickly and efficiently.
Combi Boiler Repairs
Thames Boilers specialises in repairing a wide range of combi boilers across Kent, targeting common issues like pressure loss, water leaks, and heating failures.
With over 25 years of experience, we’ve seen and fixed just about every combi boiler problem you can imagine, from frozen condensate pipes to mysterious kettling sounds that make your boiler sound like it’s hosting a tea party.
When your combi boiler starts acting up, we’ll diagnose and repair issues like:
- Pressure drops that leave you without heating or hot water
- Strange noises that keep you up at night
- Thermostat troubles that turn your home into an impromptu sauna
We understand that a broken boiler can throw your whole day off track.
That’s why we prioritise quick, efficient repairs that get your system back up and running.
As Gas Safe registered engineers, we’ll thoroughly check every component, from the heat exchanger to the condensate trap, ensuring your boiler’s working safely and efficiently.
If we spot any potential issues during our repair work, we’ll let you know straight away – no surprises, just honest advice you can trust.
Vaillant Boiler Repairs
Your trusted Vaillant boiler is showing signs of trouble? We recognise how frustrating it can be when your Vaillant starts acting up, but don’t worry – we’ve got years of experience fixing these reliable workhorses of home heating.
Common Fault | Our Solution |
---|---|
Low Water Pressure (F22) | We’ll check for leaks and restore pressure to ideal levels |
Flame Failures (F27-F29) | We’ll inspect your gas supply and flame sensors to get you back up and running |
Fan Problems (F32-F38) | We’ll clean or replace your fan components for proper ventilation |
Gas Valve Issues (F61-F62) | We’ll examine and fix any valve operation problems |
At Thames Boilers, we’re well-versed in all of Vaillant’s quirks and features. When those pesky error codes pop up on your display, we don’t just treat the symptoms – we dig deep to find the root cause. From temperamental flame sensors to stubborn circulation pumps, we’ve seen it all and fixed it all. We’ll have your Vaillant purring like a kitten again in no time, using our specialist knowledge and genuine parts to guarantee lasting repairs.
Worcester Bosch Boiler Repairs
When your Worcester Bosch boiler needs expert attention, we’re ready to diagnose and fix any issue that comes up. As Kent’s trusted heating experts, we’ve tackled countless Worcester Bosch repairs, from simple pressure issues to complex system failures.
Here’s a quick look at common Worcester Bosch problems we fix daily:
Problem | Our Solution |
---|---|
No Heat/Hot Water | We’ll check thermostats, pressure levels, and pilot lights to get you warm again |
Low Pressure | We’ll repressurise your system and hunt down any sneaky leaks |
Random Shutdowns | We’ll inspect heat exchangers and thermostats to keep your boiler running |
Strange Noises | We’ll remove trapped air and tackle limescale buildup |
Error Codes | We’ll decode and fix everything from EA to D5 alerts |
While these boilers are known for reliability, they can occasionally throw a tantrum. That’s where our expertise comes in handy. We’ll diagnose issues quickly and get your heating back to normal without any fuss. Remember, if you hear your boiler making sounds like an unhappy penguin, it’s probably time to give us a call!
Glow Worm Boiler Repairs
Reliability meets efficiency when it comes to Glow-worm boiler repairs across Kent. At Thames Boilers, we’ve seen just about every Glow-worm issue you can imagine, from frozen condensate pipes to tricky flame detection problems. We’ll quickly diagnose and fix your boiler while keeping you in the loop every step of the way.
Common Issue | What We Do |
---|---|
F16 Error Code | Clean or replace flame detection probe |
Low Pressure (F22) | Repressurise system and check for leaks |
Ignition Failure (F28) | Inspect gas supply and ignition components |
Frozen Condensate | Thaw pipes and add insulation |
PCB Problems (F13) | Test and replace circuit board if needed |
When your Glow-worm boiler starts acting up, you don’t need to worry. Whether it’s strange noises that sound like your boiler’s trying to start a rock band, or a diverter valve that’s being stubborn, we’ve got the expertise to sort it out. We’ll explain what’s wrong in plain English – no technical jargon or confusing terms. Plus, with our online booking system, you can schedule a repair at your convenience, and we’ll keep you updated on our arrival time.
Viessmann Boiler Repairs
Viessmann boilers have earned their reputation for German engineering excellence, and we’ve mastered their repair across Kent. After years of working with these systems, we’ve learned every quirk and code they can throw at us, making sure your home stays warm and comfortable.
Common Issue | What You’ll Notice | What We’ll Do |
---|---|---|
Flame Loss (F2) | Boiler won’t stay lit | Check gas supply, clean sensors |
Low Pressure | Heating isn’t effective | Repressurise system, find leaks |
Frozen Condensate | Ignition fault codes | Thaw pipe, add insulation |
Overheating (A3) | System cuts out | Clear blockages, check circulation |
Burner Problems | No ignition | Clean/repair burner assembly |
When your Viessmann starts acting up, we’re right here in Kent to help. Whether it’s a simple pressure drop or a more complex flame detection issue, we’ll diagnose and fix it quickly. We particularly love working with Viessmann’s smart diagnostic systems – they help us pinpoint problems fast, saving you time and money. And if you’re seeing any error codes pop up, don’t worry! We speak fluent Viessmann and can translate those codes into solutions that’ll get your heating back on track.
Baxi Boiler Repairs
Along with our expertise in Viessmann systems, we’ve mastered the intricacies of Baxi boilers throughout Kent. When your Baxi system acts up, we’re ready to diagnose and fix common issues like low pressure, ignition problems, or those pesky frozen condensate pipes that always seem to strike on the coldest days!
Here’s a quick look at the most common Baxi boiler issues we tackle:
Problem | Common Symptoms | Our Solution |
---|---|---|
Low Pressure | Gauge below 1 bar | We’ll top up pressure and check for leaks |
No Hot Water | Cold taps, no heating | Diverter valve check and repair if needed |
Strange Noises | Banging or gurgling | System bleeding and blockage removal |
When your Baxi displays those confusing error codes, don’t worry – we speak fluent ‘boiler.’ Whether it’s an E119 pressure warning or an E133 condensate pipe alert, we’ll get to the bottom of it. We’re particularly good at handling those tricky overheating issues that can leave you in the cold, and we’ll make sure your system’s running smoothly before we leave.
Potterton Boiler Repairs
Potterton’s reliable heating systems have been warming Kent homes for decades, and we’re well-versed in keeping them running smoothly. When your Potterton boiler needs attention, our Gas Safe registered engineers quickly diagnose and resolve common issues, from low pressure problems to frozen condensate pipes.
Issue | Common Symptoms | Our Solution |
---|---|---|
Low Pressure | Error code E119, no heating | System inspection, repressurisation |
Fan Problems | Error codes E160/E161 | Component testing, repairs |
No Hot Water | Cold taps, lukewarm showers | Diverter valve check, descaling |
Frozen Pipe | Error code E133 | Pipe thawing, insulation upgrade |
Strange Noises | Kettling, banging sounds | Chemical flush, scale removal |
We’ve seen just about every Potterton boiler issue you can imagine, and we’re ready to tackle yours with our trademark efficiency. Whether it’s a simple pressure top-up or a more complex repair involving the heat exchanger, we’ll get your home cozy again. Plus, we’ll explain everything in plain English – no confusing technical jargon here! Just straightforward solutions from your local Kent heating experts.
Ideal Boiler Repairs
Reliability meets innovation in Ideal’s range of domestic boilers, and we’re here to keep them performing at their best across Kent. When your Ideal boiler shows signs of trouble, we’ll diagnose and fix common issues like ignition failures, pressure problems, or those pesky error codes that keep you up at night.
Common Issue | Typical Symptoms | Our Solution |
---|---|---|
Error Code L2 | Won’t ignite or loud noises | Clean sensors, check spark generator, check gas supply |
Error Code F1 | Low pressure warning | System refill, leak check |
Error Code F2 | Flame loss issues | Gas supply verification, component testing |
We’ve seen it all with Ideal boilers – from frozen condensate pipes in winter to mysterious kettling sounds that worry homeowners. Our experience means we can quickly identify whether you’re dealing with a simple sensor cleaning job or if there’s a more complex issue at play. We’ll always explain what’s wrong in plain English, no technical jargon necessary. And because we’re local to Kent, we can usually get to you quickly when those heating emergencies strike, especially during those chilly months when you need your boiler most.
Alpha Boiler Repairs
Speaking of trusted heating systems, Alpha boilers present their own set of unique challenges across Kent homes. We’ve seen our fair share of issues with these units, from simple fixes to more complex repairs. When your Alpha boiler acts up, we’re here to diagnose and solve the problem efficiently.
Here’s a quick look at the most common Alpha boiler issues we repair in Kent:
Error Code | What It Means | Common Cause | Our Solution |
---|---|---|---|
E10 | Overheating | System blockages | Clear blockages, check pump |
E20 | High pressure | Expansion vessel | Release excess pressure |
E34 | Low pressure | System leaks | Find/fix leaks, refill |
E28 | Flue problems | Blocked flue | Clear obstruction |
Whether you’re dealing with strange noises from kettling or inconsistent heating, we’ve got the expertise to get your Alpha boiler running smoothly again. Our team’s particularly good at tackling those tricky sensor faults and circulation issues that often plague these systems. And don’t worry if you’re seeing any error codes – we speak fluent Alpha boiler and can translate those mysterious numbers into practical solutions!
Ariston Boiler Repairs
When it comes to Ariston boilers across Kent, we’ve dealt with every fault code and quirk these systems can throw at us. Our years of experience have taught us that Ariston boilers typically show specific patterns when they’re struggling, and we’re here to help you understand what’s going on with yours.
Common Issue | Error Code | What We Do |
---|---|---|
Low Pressure | 108 | Quick system refill and leak check |
Ignition Problems | 5P1, 5P2, A1 | Gas supply and ignition lead inspection |
Circulation Issues | 103-107 | System flush and radiator bleeding |
We’ve noticed that many Ariston owners get worried when they see error codes flashing, but there’s no need to panic. Most issues, like the dreaded 108 low pressure warning or those pesky ignition failures, are things we fix regularly. We’ll check everything from your PCB (that’s the boiler’s brain) to the air pressure switch, making sure your system gets back to peak performance. And if you’re seeing strange numbers like E34 or A41 on your display, don’t worry – we’ve got the tools and know-how to sort those out too.
Biasi Boiler Repairs
Having serviced countless Biasi boilers across Kent, we’ve developed deep expertise in diagnosing and repairing these Italian-engineered systems. When homeowners call us about their Biasi boiler issues, we quickly identify common problems using our extensive knowledge of their error codes and symptoms.
Error Code | Issue | Our Solution |
---|---|---|
ER04 | Low Pressure | We’ll check for leaks, top up pressure, and guarantee system integrity |
ER02 | Overheating | We diagnose pump issues, clear blockages, and restore safe operation |
ER12 | No Hot Water | We repair or replace faulty diverter valves for reliable hot water |
If you’re hearing strange noises from your Biasi boiler, it’s likely due to trapped air or kettling. When you spot error codes like ER01 (ignition failure) or ER03 (flame detection issues), don’t worry! These are common challenges we’re well-equipped to handle. And if you notice any water leaks, we’ll pinpoint the source and fix it before it causes serious damage to your system.
Vokera Boiler Repairs
Beyond Biasi systems, we regularly repair and service Vokera boilers throughout Kent. We’ve become quite familiar with these efficient heating systems and their common quirks over the years. When your Vokera boiler acts up, we are aware exactly what to look for and how to fix it.
We frequently encounter and resolve several common Vokera issues that homeowners face. Here’s a quick look at the most typical problems we handle:
Fault Code | Issue | What We Do |
---|---|---|
A01 | Ignition Problems | Check gas supply, clean electrodes |
A03 | Fan Faults | Test components, replace if needed |
A04 | Overheating | Clear blockages, check pump |
A40/A41 | Low Pressure | Find leaks, repressurize system |
A07/A08 | Sensor Issues | Test and replace thermistors |
Whether you’re dealing with a frozen condensate pipe in winter or mysterious error codes flashing on your display, we’ve got the expertise to get your Vokera boiler running smoothly again. Our experience with these systems means we can diagnose issues quickly and fix them right the first time.
Keston Boiler Repairs
Keston boilers have earned a reputation for reliability, but even these quality systems can develop issues over time. We’ve seen quite a few common problems that Keston owners face, and our team is here to help you understand what might be going wrong with yours.
Error Code | What It Means | What We’ll Check | Common Causes | How We Fix It |
---|---|---|---|---|
E01 | Ignition Failure | Gas Supply | Low Pressure/Blockage | Clear Lines/Reset |
E02 | False Flame | Gas Valve | Power Supply Issues | Replace/Repair Valve |
E37/F1 | Low Pressure | System Pressure | Leaks/Air Locks | Top Up/Bleed System |
E05 | Fan Problems | Fan Operation | Blocked/Failed Fan | Clean/Replace Fan |
F9/E12-22 | Control Issues | PCB Function | Circuit Board Faults | Board Repair/Replace |
When you call us about your Keston boiler, we’ll start by checking these common issues. Our experienced team is aware of exactly what to look for, whether it’s a simple pressure drop or a more complex electrical problem. We’ll diagnose the issue quickly and get your heating back up and running with minimal fuss – because we understand there’s nothing worse than being stuck without hot water!

Common Boiler Problems
At Thames Boilers, we’ve seen just about every boiler problem you can imagine in Kent homes over the years.
We regularly help homeowners with common issues like no hot water, heating that won’t come on, dropping boiler pressure, fluctuating water temperatures, and those mysterious fault codes that pop up on display screens.
Let’s look at these everyday boiler problems and what you can do about them, starting with the most common ones we encounter.
No hot water but heating is working
One of Kent’s most common boiler issues occurs when your heating works fine but there’s no hot water available. We see this problem quite frequently at Thames Boilers, and it’s usually more straightforward to fix than you might think.
If you’ve got a combi boiler, the culprit is typically either a faulty flow switch or a stuck diverter valve. Think of the diverter valve as a traffic controller – it’s responsible for directing hot water to either your radiators or your taps. When it gets stuck, you’ll end up with heat in one place but not the other.
For those with conventional boilers (the ones with hot water tanks), we often find it’s down to a motorised valve that’s given up the ghost. These valves control the flow of hot water to your cylinder, and when they fail, you’ll be left with cold showers – not exactly the wake-up call anyone wants!
At Thames Boilers, we’re experts at diagnosing and fixing these issues quickly. If you’re experiencing this problem in Kent, don’t suffer through cold showers – we’re just a click away on our online booking system.
Hot water is working, but radiators are not heating up
The frustration of cold radiators despite having hot water is another frequent issue we encounter across Kent homes.
As your local heating experts, we’ve seen this problem numerous times, and it’s usually caused by one of several common culprits.
For combi boilers, we often find it’s a stuck diverter valve that’s not directing hot water to your radiators properly.
If you’ve got a conventional boiler system, the issue typically stems from a faulty motorised valve.
But before you call us out, here’s a quick tip that might save you some money: check your programmer and room thermostat first.
We’ve lost count of how many times we’ve visited homes only to discover the heating wasn’t actually scheduled to come on, or the thermostat was set too low!
If these simple checks don’t solve the problem, that’s when we need to take a closer look.
At Thames Boilers, we’ll diagnose the exact cause and get your radiators warming up again quickly.
Boiler Pressure gauge keeps going down
Dropping boiler pressure is another common issue we regularly fix across Kent homes. If you’ve noticed your pressure gauge keeps falling below 1 bar, there’s likely a leak somewhere in your heating system.
While it might seem mysterious at first, we’ve got plenty of experience tracking down these sneaky leaks! The most common culprits we encounter are small leaks from the pressure relief valve (that pipe sticking out of your wall), hairline cracks in radiators, or tiny drips from pipe joints.
Sometimes, it’s as simple as a faulty expansion vessel that’s not doing its job properly. We’ll often find homeowners scratching their heads because they can’t spot any obvious puddles, but even the smallest leak can cause your pressure to drop over time.
At Thames Boilers, we’re experts at finding and fixing these pressure problems. In fact, we’ve helped countless Kent homeowners solve this exact issue.
If you’re tired of constantly topping up your boiler pressure, give us a call or book online – we’ll track down that leak and get your system running smoothly again!
Hot water on combi boiler runs hot and cold
Fluctuating hot water temperatures from your combi boiler can be incredibly frustrating, especially during your morning shower.
It’s clear there’s nothing worse than jumping out of the way of sudden cold water when you’re trying to get ready for work!
At Thames Boilers, we’ve seen this issue many times across Kent, and it usually comes down to one of two main culprits.
The most common cause is a blocked plate heat exchanger in your combi boiler. Think of it like the arteries in your body – over time, they can get clogged up with limescale and debris, affecting how well hot water flows through your system.
If you’re only experiencing the hot-and-cold problem in your shower, though, the issue might be simpler – it could just be a faulty shower cartridge that needs replacing.
We’ll help you identify which problem you’re dealing with and fix it properly the first time.
Being Gas Safe registered engineers with over 25 years of experience, we’ve tackled countless temperature fluctuation issues across Kent, and we’re here to help get your hot water running smoothly again.
There’s a fault code on my boiler
Seeing an unexpected fault code pop up on your boiler’s display can be unsettling, especially during Kent’s colder months.
At Thames Boilers, we recognise how concerning these mysterious combinations of letters and numbers can be, but don’t panic just yet – they’re actually quite helpful in diagnosing what’s wrong.
When you spot a fault code, the first thing we recommend is doing a quick online search. Simply type in your boiler’s make (like Vaillant or Worcester) followed by the specific code (such as “F75” for Vaillant). This can give you a good initial idea of what might be causing the issue.
Sometimes, it could be something as simple as low pressure, which you might be able to fix yourself.
However, while fault codes are useful indicators, they shouldn’t be your only guide. If you’re unsure about what the code means or how to resolve it, it’s best to get professional help.
We’ve been dealing with boiler fault codes across Kent since 2017, and we can quickly diagnose and fix whatever’s causing that pesky code to appear on your display.
Boiler is making a loud banging sound when it turns on
While fault codes can help diagnose boiler issues, a loud banging sound when your boiler fires up is hard to miss – and it’s not something you should ignore. This concerning noise, often called “kettling,” usually means there’s a circulation problem that’s causing your boiler to overheat.
At Thames Boilers, we’ve found that the most common culprit is a faulty pump that’s not moving water through your system properly. Think of it like a clogged straw – when water can’t flow freely, it creates that alarming bang.
Sometimes, it’s just trapped air in your system (those pesky air locks!), or in more serious cases, your main heat exchanger might be blocked.
We’d strongly recommend getting this checked out quickly, as overheating can damage your boiler’s components and lead to more expensive repairs down the line. Plus, that banging noise probably isn’t doing your peace of mind any favors!
While you’re waiting for an engineer, don’t keep trying to restart the boiler – it’s best to leave it off until a professional can take a look and resolve the underlying issue.

Kent
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