Boiler Repair Cardiff
Fast, Reliable Boiler Repairs Across Cardiff
Our experienced Gas Safe engineers diagnose and repair boiler faults quickly and safely, restoring heating and hot water.
Book an Engineer →Your Local Plumber in Cardiff
We are Cardiff-based Gas Safe engineers providing dependable boiler repairs for homes of all ages and heating systems.
Gas Safe Registered (518700)
NJ Harkus is Gas Safe registered (518700), City & Guilds qualified and CIPHE members, with full public liability insurance for all plumbing, heating and gas work.
Highly Recommended & Reviewed
Thousands of customers recommend our boiler repair service for reliability, knowledge, and quality workmanship.
Boiler Fault Diagnosis & Repair Services
Boiler Faults Fixed Properly
A faulty boiler can be stressful, particularly when it affects your heating or hot water. At NJ Harkus, we provide professional boiler repair services across Cardiff, diagnosing faults accurately and carrying out repairs safely and efficiently.
Our Gas Safe-registered engineers are experienced in repairing a wide range of boiler makes and models, including modern condensing boilers and older systems. We focus on identifying the root cause of the issue rather than applying temporary fixes, helping to prevent recurring problems and unnecessary costs.
Our boiler repair service typically covers:
- Full fault diagnosis and system checks
- Repairs to common boiler issues and breakdowns
- Replacement of faulty components where required
- Clear explanations of the fault and repair options
- Safe testing before returning the boiler to service
Where a repair is not cost-effective, we provide honest advice and discuss suitable next steps, such as a new boiler installation.
Arrange A Boiler Repair Appointment
Boiler Repair Services Across Cardiff & Nearby Areas
Our boiler repair service is available throughout Cardiff and surrounding areas, including Penarth, Barry, Dinas Powys, Radyr, Llandaff, Roath and Pontcanna. As a local company, we understand the heating systems commonly found in Cardiff properties and aim to respond promptly when repairs are needed. If you are unsure whether we cover your area, our team will be happy to confirm availability.
Business Hours
24 Hours, 7 Days A Week
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We Are Highly Recommended in Cardiff & The Surrounding Areas
Trusted Solutions For Boiler Breakdowns
Experienced With Modern & Older Boilers
Boiler faults can range from minor performance issues to full breakdowns. Our Cardiff plumbers are trained to accurately diagnose problems and explain the cause clearly, so you can make informed decisions about repairs.
We regularly repair issues such as loss of heating or hot water, unusual noises, pressure problems, error codes, leaks, and inconsistent performance. By working methodically and testing thoroughly, we ensure repairs are completed safely and in line with current regulations.
Our team works with leading boiler brands including Worcester Bosch, Vaillant, Viessmann, Baxi and Ideal, giving us the experience needed to repair a wide range of systems efficiently.
Whether your boiler needs servicing, a straightforward repair or further investigation, our team approaches every job with care and attention to detail.
Emergency Boiler Repair Cardiff
Fast Support When Your Boiler Fails
A boiler breakdown can happen without warning and often at the worst possible time. At NJ Harkus, we provide emergency boiler repair services across Cardiff, responding quickly to urgent heating and hot water issues.
Our Gas Safe-registered engineers are equipped to diagnose faults efficiently and, where possible, carry out safe repairs during the initial visit. Whether your boiler has stopped working completely, is losing pressure, or displaying fault codes, we focus on restoring heating and hot water as quickly and reliably as possible.
We understand the impact a broken boiler can have on your home, particularly during colder weather. That is why our emergency call-out service prioritises clear communication, practical solutions, and professional workmanship from the moment you contact us.
Frequently Asked Questions
Our Boiler Repair FAQs
How quickly can we attend a boiler repair?
We aim to respond as quickly as possible, subject to availability and the nature of the fault.
Is it worth repairing an older boiler?
This depends on the fault and overall condition, which we will explain clearly.
Do we offer emergency boiler repairs?
Yes, we provide emergency boiler repair services across Cardiff.
What are the most common boiler repairs we carry out?
Unfortunately, boilers do break down and require repairs as they get older. Some of the most common boiler repairs we carry out in Cardiff include low pressure, fan faults, gas valve faults, blocked condensate, and so much more. If your boiler breaks down, it will often display an error code, which will allow us to carry out diagnostics.
