A Armstrong Plumbing & Heating

Boiler Repairs

Fast, Gas Safe boiler fault-finding and repairs across New Milton, Christchurch and Lymington. Experienced engineers, manufacturer parts and full safety checks to get heating and hot water back on quickly.

Boiler fault-finding and repairs from Gas Safe engineers

Using premium diagnostic kit and manufacturer parts from Vaillant and Glow-worm, our Gas Safe registered engineers carry out precise fault-finding and safe, lasting repairs. We tackle kettling, ignition faults, low pressure, leaks and no heating or hot water on all major makes. Every repair includes full safety checks, system testing and clear advice on repair vs replacement, with manufacturer-backed parts where eligible.

We’re heating engineers based in New Milton, serving Lymington, Christchurch, Highcliffe-on-Sea and the surrounding area. Our boiler repair in New Milton covers everything from a boiler that won’t fire to a leaking pump.

Boiler fault-finding and repairs from Gas Safe engineers

How a boiler repair works

01

Call & Triage

Tell us the fault and any error codes. We assess urgency, give practical advice and arrange an engineer visit at a suitable time.

02

Onsite Fault-Finding

A Gas Safe engineer uses diagnostic kit and manufacturer manuals to identify the root cause, not just symptoms, and explains the options.

03

Clear Quote

You get the cost of the repair before any work starts. If the boiler is old or keeps failing, we'll price a replacement too, so you can compare.

04

Repair, Test & Certify

We fit quality or manufacturer parts, complete safety checks and system testing, then leave a clear report and advice on longer-term care.

What you get with A Armstrong Plumbing & Heating

Gas Safe Registered Engineers

All gas work and repairs are undertaken by Gas Safe registered engineers, for safe, compliant work in your home.

Manufacturer-Grade Parts & Accreditations

Vaillant and Glow-worm accreditation means we use approved parts and can access manufacturer guidance and warranties where available.

Local, Family-Run & Trusted

Over 20 years' experience serving New Milton and nearby towns, Checkatrade-vetted and fully insured for reliable, tidy workmanship.

What we repair, by symptom

We handle the common and the tricky: no heating or hot water, low pressure, kettling or banging noises, ignition and electrical faults, leaking components, failed pumps, thermostats and diverter valves. Our engineers work on all major makes and models and bring diagnostic tools to pinpoint the fault on the first visit where possible.

No heating or no hot water. Check the thermostat is turned up, the timer is on and the boiler has power. If you have hot water but no heating, read no heating but hot water; if it's the other way round, see no hot water but heating works. A diverter valve, pump or thermostat is often behind it.

Low pressure. Most combi boilers run at around 1 to 1.5 bar when cold. You can top up the pressure yourself, but if it keeps dropping there's likely a leak or a faulty valve. Our guide to a boiler that keeps losing pressure explains the next steps.

Ignition faults and lockouts. If the boiler won't fire and shows a fault code, note the code and press reset once, as your manual explains. If it locks out again, leave it for an engineer.

Leaks. Turn the boiler off and put a bowl or towel underneath. Our guide to a leak under the boiler covers what to do while you wait.

Kettling and banging. Usually limescale or sludge in the heat exchanger. Read noisy boiler causes, and ask us whether a power flush would help.

If you smell gas, turn off the gas at the meter if you can, open the windows, don't use switches or flames, and call the National Gas Emergency Service on 0800 111 999.

What affects the cost of a boiler repair

We tell you the cost of the repair before any work starts. The main things that shape it are:

  • The fault: some faults are found and fixed in one visit; intermittent faults take longer to trace

  • The part needed: a thermostat or sensor costs less than a pump, fan, diverter valve or circuit board

  • Whether the part is in stock: some parts need ordering, which means a second visit

  • The make and age of the boiler: parts for older or less common boilers cost more and are harder to find

If a boiler is old or keeps breaking down, we'll be honest about whether a new boiler is the better buy.

Safety and transparency

Repairs are completed to industry standards with a final safety check and system test. As a family-run New Milton company with Gas Safe registration, Vaillant and Glow-worm accreditation and G3 unvented, we prioritise safe, compliant repairs and clear communication. If replacement looks the more sensible option, we'll explain why and provide impartial next steps. A yearly boiler service catches many faults before they become breakdowns.

"made it to my property the same day squeezing the job in at the end of the evening resolving my lack of hot water" - Steven Baker, Google review

"Brilliant service, solved a complicated problem and explained everything as he went along. I now have heating and a boiler that doesn't keep going into fault." - Groveley Precision, Google review

Frequently Asked Questions

Yes. Our engineers have experience with most major manufacturers and models. For brand-specific faults we use manufacturer manuals and approved parts, and where a specialist part is required we source it quickly and fit it to maintain warranty and reliability.

It depends on the fault, the part needed and the make and age of your boiler. We find the fault first and tell you the cost before any repair starts, so there are no surprises.

We prioritise urgent heating and hot water failures, especially for vulnerable households. Response times vary by workload and location; when you call we'll triage the situation and aim to book the earliest possible visit or offer same-day attendance where feasible.

We guarantee workmanship on our repairs and fit quality or manufacturer-approved parts. Guarantee terms vary by part and manufacturer, so we'll confirm any warranty details before starting work and issue a written record after completion.

We assess the age, condition, frequency of breakdowns and overall efficiency. If a boiler is older or repeatedly failing, we'll outline the repair costs and the likely lifespan moving forward so you can make an informed choice on repair versus a new, more efficient system.

Every gas repair includes safety checks such as combustion analysis where applicable, pressure and leak tests, flue checks and a full systems test. We leave a clear report and advise on any follow-up actions to keep the system running safely and efficiently.

Get your boiler fixed today

For fast, Gas Safe boiler repairs in New Milton and nearby towns, get in touch. We'll arrange a prompt diagnostic visit and explain the safest, most cost-effective solution.

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