My boiler has stopped — what should I check before calling an engineer?

Five minutes of checks save a callout surprisingly often: is there power to the boiler (tripped switch, blown fuse, smart stat batteries); is the programmer actually calling for heat; what does the pressure gauge read (below around 1 bar, many boilers lock out — repressurise per the manual); is there a fault code (note it before resetting); and on a freezing day, a frozen condensate pipe is a classic full-stop that gentle thawing fixes. If those don't revive it, the code you noted is the engineer's head start.

Can any plumber fix my boiler?

No — legally, only an engineer on the Gas Safe Register may work on a gas boiler, and registration is appliance-specific: the ID card shows what each engineer is qualified for. Every engineer listed on this page is checked against the register before listing; check the card on the doorstep anyway — good engineers expect it.

Boiler Repair Richmond upon Thames

A boiler fault picks its moment — the first cold morning, the houseguest weekend — and in a borough where much of the housing is older than its heating and the water scales everything it warms, the fault usually has history behind it. The Gas Safe registered engineers listed below diagnose and repair boilers across the borough; this page covers what the symptoms mean, what’s legally required, and when repair stops being the right answer.

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⚠️ Smell gas? Don’t touch switches — call the National Gas Emergency Service free on 0800 111 999 from outside, 24/7, before anything else.
⚠️ Boiler repair is legally restricted work: only engineers on the Gas Safe Register may work on gas boilers.

Contact verified Gas Safe engineers in Richmond upon Thames ↓

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Gas smell or suspected carbon monoxide: out first, then 0800 111 999 — full steps in Safety first.
What this covers: boiler breakdowns, fault codes, no heat / no hot water, pressure loss, leaks from the boiler, strange noises.
Radiators cold but boiler fine? That’s the system side — Central Heating Repair in Richmond upon Thames.
Coverage: the whole borough — TW1, TW2, TW9–TW12, SW13, SW14 and Hampton Wick’s KT1.
Costs: each engineer quotes directly — editorial guide below.

Jump to: Safety first · What the symptoms mean · The engineer’s visit · Repair or replace? · Landlords, tenants and RHP · Costs · FAQs

Safety first

If you can smell gas: don’t operate light switches or anything electrical, no naked flames, no smoking. Open doors and windows if it’s safe to do so. If you know where the gas meter is and can reach it safely, turn the supply off at the meter — unless the meter is in a cellar or basement. Leave the property if the smell is strong or you feel unwell, and call the National Gas Emergency Service free on 0800 111 999 from outside.¹ Don’t go back inside until you’re told it’s safe.

Carbon monoxide has no smell — watch for the boiler’s own warnings: a lazy yellow or orange flame where it should burn crisp blue, soot or staining around the appliance, excessive condensation in the room, a pilot that keeps going out — and in people, headaches, dizziness or nausea that ease away from home. If CO is suspected: stop using the appliance, get fresh air, call 0800 111 999, and don’t use the boiler again until a Gas Safe registered engineer has checked it. A working audible CO alarm near the boiler is the cheap layer of protection every home with gas should have.

The legal line is absolute: anyone working on a gas boiler must be on the Gas Safe Register — it’s the law, and “a mate who’s good with boilers” is how flues end up lethal.² Every engineer listed on this page is checked against the register before listing and re-verified annually. You can — and should — also check the engineer’s ID card on the doorstep: it shows what work they’re qualified for, and the register confirms it online.

What the symptoms mean

No heat and no hot water. The full stop. Causes range from the trivial — a tripped fuse, a stuck programmer, pressure below the boiler’s cut-off — to failed components: pump, diverter valve, ignition, printed circuit board. Check the obvious first (power, programmer, pressure gauge, and on older systems the pilot), then it’s an engineer’s diagnosis.

Hot water but no heating — or the reverse. On a combi this classically points to the diverter valve, the component that chooses between tap and radiator; one side failing while the other works is its signature. Repairable, common, known cost.

Pressure that keeps dropping. The gauge creeping below 1 bar means water is leaving the sealed system: through a radiator valve, a weeping joint, the boiler’s own pressure relief valve, or an expansion vessel that’s lost its charge. Repressurising is the symptom-fix anyone can do; finding why is the job — somewhere between this page (boiler-side components), Central Heating Repair (system side) and Leak Detection (when the water shows nowhere).

Noises with names. Kettling — a rumble like a boiling kettle — is classically scale on the heat exchanger, and Richmond boilers see the same hard-water scale pressure as much of the Thames Water region: Thames Water confirms all the water in its region is hard.³ Banging on heat-up suggests trapped air or debris; whistling, flow restriction. Each is information, not yet a verdict.

Leaks from the boiler itself. Switch the boiler off and isolate it electrically if safe; water inside a gas appliance’s casing is an engineer-now problem, not a watch-and-wait one.

Fault codes. Modern boilers tell you what’s wrong in manufacturer dialect — EA, F75, E119 and the rest. Note the code before resetting (it narrows the diagnosis, though the engineer will still test rather than assume), reset once if the manual says you may, and if it returns, stop resetting: repeated resets against a real fault can mask a problem that wants fixing. Our Boiler Fault Codes guide decodes the common families by brand.

One borough wrinkle — where the boiler lives. In converted flats around Richmond and Twickenham, the boiler is often boxed into a kitchen cupboard or served by a concealed flue, and concealed flues need proper inspection access before work can go beyond external checks — while on cold mornings a frozen or badly routed condensate pipe can mimic a full breakdown. Tell the engineer where the boiler is and what access exists when you book; it changes the visit.

What the engineer’s visit involves

A proper repair visit runs diagnosis before parts: the fault code read and history checked, the system’s pressure and condition assessed, the suspect component tested rather than assumed, and the repair priced before it’s done. Be ready for first-visit realism too: an engineer may restore pressure, replace a common sensor or ignition part if it’s stocked on the van, or make the appliance safe — while PCB, fan, gas valve and heat-exchanger faults often need ordered parts and a return visit, and a boiler that isn’t safe stays off until then. Expect straight answers to three questions — what failed, why it failed, and whether the failure says anything about the boiler’s wider condition. Scale damage, repeated PCB faults on an ageing unit, or a heat exchanger on its way out are facts you want stated plainly, because they feed the repair-or-replace arithmetic below. After any repair: the boiler fired and tested through a full cycle, system pressure set, and the work documented — make and model, fault, parts fitted — because that paper trail matters for warranties and for the next engineer.

One honest boundary: if the diagnosis lands on the system rather than the boiler — sludged radiators starving the pump, a system leak dropping pressure — the fix moves to Central Heating Repair territory, and a good engineer says so rather than fitting boiler parts at a system problem.

Repair or replace? The honest arithmetic

Repair wins while parts are available, the heat exchanger is sound, and the fault is a known component on a boiler with life left. Replacement starts winning when the repair bill meets any of these: parts obsolete or scarce (often more likely as boilers pass 12–15 years), a heat exchanger failure (usually the economic end), repeated different faults in quick succession (the cascade pattern of an ageing unit), or a repair quote that’s a large fraction of a new boiler’s installed cost on a unit already old enough to repeat the trick. Age alone isn’t a verdict — a well-serviced 12-year-old boiler can out-behave a neglected 6-year-old one — but money spent on a dying platform is money not spent on its successor. The full decision framework, including efficiency gains and warranty value, is in our Repair or Replace guide — and when the answer is replace, the specification questions live on Boiler Installation in Richmond upon Thames.

Landlords, tenants and RHP

Landlords carry a specific legal duty. Under Regulation 36 of the Gas Safety (Installation and Use) Regulations 1998, landlords must ensure that landlord-provided gas appliances, flues and pipework are maintained in a safe condition, with a gas safety check by a Gas Safe registered engineer at intervals of no more than 12 months and a record provided to tenants⁴ — and since the 2018 amendment, checks can be carried out up to two months before the due date while keeping the original deadline. The HSE’s landlord guidance confirms these duties cover gas appliances, fittings and flues provided for tenants’ use, and that they can’t be transferred to the tenant by the tenancy agreement.⁵ A broken boiler in a rented home is therefore normally the landlord’s repair — report it in writing, promptly. The wider compliance picture is in our Landlord Plumbing Compliance Checklist.

Mansion blocks and communal heating. In some of the borough’s mansion blocks and larger developments — Barnes, Richmond, Twickenham — heating and hot water come from communal plant rather than an individual boiler in the flat. Check which you have before booking: faults on communal systems route through the managing agent, freeholder or housing provider, not a Gas Safe callout to your own flat.

RHP tenants: Richmond’s former council housing is now managed by RHP after the 2000 stock transfer,⁷ and a failed boiler in an RHP home is their repair route on 0800 032 2433. Note how RHP defines the emergency categories: no hot water counts as an emergency during the winter months, and total loss of heating between September and April when the temperature is below 10°C — with the emergency lines themselves open 24/7.⁶ Either way, report to RHP before paying privately.

What boiler repair costs in Richmond upon Thames

Each listed engineer sets their own prices and quotes directly — these figures are an editorial guide to the local range, nothing more.

Job	Typical editorial estimate
Diagnostic visit	£80–£150
Minor repair (sensor, ignition, valve)	£150–£300
Major component (pump, diverter, fan, PCB)	£250–£500
Heat exchanger replacement	often uneconomic — compare with replacement

Editorial estimates only — not regulated rates, not market data. Parts move the number more than labour: ask for the diagnosis and the itemised parts price before approving, and ask the repair-or-replace question out loud on anything over ten years old. Our How to Read a Plumbing Quote guide covers the rest; the London Plumbing Costs & Compliance Guide has the wider picture.

Frequently asked questions

Five minutes of checks save a callout surprisingly often: is there power to the boiler — tripped switch, blown fuse, smart stat batteries — and is the programmer actually calling for heat?

What does the pressure gauge read? Below around 1 bar, many boilers lock out, so repressurise per the manual.

Is there a fault code? Note it before resetting.

On a freezing day, a frozen condensate pipe is a classic full-stop that gentle thawing fixes.

If those don’t revive it, the code you noted is the engineer’s head start.

No — legally, only an engineer on the Gas Safe Register may work on a gas boiler, and registration is appliance-specific: the ID card shows what each engineer is qualified for.²

Every engineer listed on this page is checked against the register before listing; check the card on the doorstep anyway — good engineers expect it.

Gas Safe Register — check an engineer

It’s a message: water is leaving the sealed system.

Occasional seasonal top-ups can be benign; weekly repressurising is a leak or a failed component — radiator valve, joint, the boiler’s pressure relief valve or expansion vessel.

Keep repressurising as a stopgap, but book the diagnosis.

The destinations are this page for boiler components, Central Heating Repair for the system side, or Leak Detection if the water shows nowhere.

Because it’s doing what a kettle does: boiling water against scale.

Kettling is classically scale on the heat exchanger restricting flow — and Richmond boilers see the same hard-water scale pressure as much of the Thames Water region, whose water is hard throughout.³

A system flush and scale treatment can help if caught early; left alone, it shortens the heat exchanger’s life — which is the expensive component.

The London Hard Water guide covers protection options.

Thames Water — hard water

Sometimes — it’s arithmetic, not dogma.

A known component on a sound, serviced unit: often yes.

Obsolete parts, a failing heat exchanger, or the third different fault this year: the money is voting for replacement.

Ask the engineer to price the repair and state the boiler’s condition plainly, then run the numbers — our Repair or Replace guide gives the framework, and Boiler Installation covers the next step if replacement wins.

Normally your landlord.

Regulation 36 of the Gas Safety (Installation and Use) Regulations 1998 puts maintenance of landlord-provided gas appliances, flues and pipework on the landlord, with an annual gas safety check and a record to tenants⁴ — duties the HSE confirms can’t be passed to you in the tenancy.⁵

Report the breakdown in writing and keep a copy.

RHP tenants: report on 0800 032 2433 — RHP treats no hot water as an emergency during winter months, and total loss of heating between September and April below 10°C, with emergency lines open 24/7.⁶

Gas Safety (Installation and Use) Regulations 1998 — Regulation 36

HSE — landlord gas safety responsibilities

RHP repairs

Treat it as real: stop using fuel-burning appliances, open doors and windows, get everyone into fresh air, and call the National Gas Emergency Service on 0800 111 999.¹

Anyone with symptoms — headache, dizziness, nausea — should seek medical advice and say CO is suspected.

Don’t use the boiler again until a Gas Safe registered engineer has examined it; the alarm did its job, now let the engineer do theirs.

Gas Safe Register — gas emergency

Why verified Gas Safe engineers

Gas work is the one trade where the wrong choice can be lethal rather than expensive — so verification here is specific: where boiler and gas work is involved, registration is confirmed directly with the Gas Safe Register before listing, alongside the standard checks — legitimate trading and a named contact, evidence of public liability insurance, coverage of Richmond upon Thames’s postcodes — all re-verified annually. Check the engineer’s ID card on arrival too; the register exists to be used. There’s no pay-to-play ranking — any Sponsored slot is labelled “Sponsored” — and no customer middleman fee: enquiries go directly to the engineer. Full verification process →

Related services in Richmond upon Thames

Related guides

A boiler repair in Richmond runs on three certainties: the work is Gas Safe registered or it doesn’t happen; the symptoms and the fault code narrow the diagnosis before the casing comes off — in this borough, often with scale or a boxed-in conversion in the story; and on an ageing unit, the honest engineer prices the repair and states the prognosis. The verified engineers above work to all three.

Contact verified Gas Safe engineers in Richmond upon Thames ↑

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Last reviewed: May 2026 by Adiel Khan — SFEDI-accredited business advisor 20+ years experience (South East Enterprise Ltd) and operator of VerifiedPlumbers. LinkedIn ↗

This page is checked for compliance and regulatory accuracy against the regulations and bodies cited on this page — including the Gas Safety (Installation and Use) Regulations 1998, the Health and Safety Executive, the Gas Safe Register, the National Gas Emergency Service, Thames Water and Richmond Housing Partnership. Source links are provided within this page where relevant.

Sources & further reading

National Gas — Emergency contacts (gas emergency: 0800 111 999, free, 24/7)
Gas Safe Register (the official register; gas work is legally restricted to registered engineers)
Thames Water — Hard water (all water in the region is hard)
Gas Safety (Installation and Use) Regulations 1998 — Regulation 36 (landlords’ duties: maintenance and annual checks of relevant gas fittings and flues, with records)
HSE — Gas safety: landlords and letting agents (duties cover gas appliances, fittings and flues provided for tenants; cannot be transferred to the tenant; checks may be brought forward up to two months while retaining the deadline date)
Richmond Housing Partnership — Repairs (emergency repairs include no hot water during winter months, and total loss of heating September–April below 10°C; emergency line 0800 032 2433, open 24/7)
Richmond Council — Ten years of the Tenants’ Champion (2000 stock transfer to Richmond Housing Partnership)

Boiler Repair in Richmond upon Thames | Verified Gas Safe Engineers