A boiler breakdown in Lisburn is stressful — especially during a Northern Ireland winter. When you contact Kelly Heating NI, Kieran or Jordan will ask about your boiler make, model and any error codes displayed, and will do their best to help you as quickly as possible.
Where possible, we'll try to guide you through common minor issues over the phone — things like low pressure, a frozen condensate pipe, or incorrect thermostat settings — before arranging a callout. If the boiler needs an engineer, we'll get to you in Lisburn as fast as we can.
What to Do When Your Boiler Breaks Down in Lisburn
Check the error code
Look at your boiler's digital display. Note any error code shown — this helps us diagnose the problem faster. If there's no display, note the boiler make and model (usually on a label on the front).
Check your supplies
Check that other gas appliances (hob, fire) are working. If not, you may have a supply issue rather than a boiler fault. For oil boilers, check your oil level in the tank.
Check the pressure
Most modern combi boilers need a pressure of around 1–1.5 bar. If the gauge reads below 1, low pressure may be the issue — we can guide you through repressurising over the phone.
Call or WhatsApp us
Call 07934 776 774 or WhatsApp us with your boiler details. We'll advise you on next steps and arrange a visit to Lisburn as quickly as we can.
Common Boiler Faults We Repair in Lisburn
Kieran and his team have experience repairing all common gas and oil boiler faults across the main brands — Worcester Bosch, Vaillant, Ideal, Warmflow, Grant, Firebird and others.
- No heating or hot water
- Low boiler pressure
- Frozen condensate pipe (common in Lisburn and Northern Ireland winters)
- Pilot light or ignition failure
- Boiler lockout — error codes and fault resets
- Faulty diverter valve (hot water but no heating, or vice versa)
- Kettling — banging or rumbling sounds from the boiler or pipes
- Thermostat or controls failure
- PCB (printed circuit board) faults
- Pump failure
- Heat exchanger issues
- Oil boiler nozzle or burner faults
Oil Boiler Repair vs Gas Boiler Repair in Lisburn
Gas boiler repair: Must be carried out by a Gas Safe registered engineer. Kieran Kelly is Gas Safe registered, No. 557696. You should never attempt to work on a gas boiler yourself — this is both dangerous and illegal.
Oil boiler repair: Must be carried out by an OFTEC registered engineer. Kelly Heating NI is OFTEC certified and experienced with all major oil boiler brands used across Lisburn and Greater Belfast. Many properties in and around Lisburn are off the gas network and rely on oil — we know these systems well.
Repair or Replace? We'll Give You an Honest Answer
When we attend a breakdown in Lisburn, we'll diagnose the fault and give you a clear picture of your options before any work begins. If the repair is straightforward and cost-effective, we'll fix it. If the boiler is old, unreliable or the repair cost approaches replacement value, we'll tell you that honestly too.
We won't carry out expensive repairs on a boiler that's better replaced. And we won't push you toward a new boiler if a repair makes better sense. You'll get an honest assessment and the options — the decision is yours.
- Boiler under 10 years old → repair usually makes sense
- Boiler 10–15 years old, first breakdown → assess repair cost vs replacement
- Boiler over 15 years old or repeated breakdowns → replacement is usually the better investment
- Repair cost over £500 on an ageing boiler → get a replacement quote first
Find out more about our boiler installation service in Lisburn →
Preventing Future Breakdowns
The best way to avoid unexpected boiler breakdowns is an annual boiler service. A yearly service keeps your boiler running efficiently, extends its lifespan, and in most cases is required to keep the manufacturer's warranty valid.
Find out about our boiler servicing service →
Boiler Broken Down in Lisburn?
Call us now — we'll help as quickly as we can.
Boiler Breakdown Cover in Lisburn
Many Lisburn homeowners ask about boiler cover plans. While we don't offer a subscription cover plan ourselves, we provide straightforward, honest repair pricing — a callout and diagnostic fee, and a clear quote before any repair work begins. No hidden charges, no unexpected bills.
Areas Covered Around Lisburn
Kelly Heating NI covers all areas of Lisburn and the surrounding district for boiler breakdown and repair, including Lambeg, Sprucefield, Hillsborough, Dunmurry, Finaghy and the wider South Belfast area. If you're unsure whether we cover your area, call us — we're happy to advise.
Frequently Asked Questions — Boiler Breakdown Lisburn
Yes. Kelly Heating NI covers Lisburn, Lambeg, Sprucefield, Hillsborough, Dunmurry and the wider Lisburn area for gas and oil boiler breakdown and repair.
We are not a 24-hour service, but we will help you as quickly as we can. Call or WhatsApp us and we will respond as promptly as possible.
The cost depends on the fault. We charge a callout and diagnostic fee and will give you a clear price for any repair before work begins. No hidden charges.
Yes. We repair both gas and oil boilers across Lisburn. Kieran Kelly is Gas Safe registered (No. 557696) for gas work and OFTEC certified for oil boiler repairs.
Fault codes vary by manufacturer. Call or WhatsApp us with the code and your boiler make and model and we can often help you identify the issue before arranging a visit to Lisburn.
If your boiler is under 10 years old and the repair cost is reasonable, repair is usually the right choice. If it is over 15 years old, repeatedly breaking down, or the repair cost is high, replacement is often more cost-effective. We will give you an honest view.