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⚠️ Smell gas or feel dizzy or sick? Leave the house and call the National Gas Emergency Service on 0800 111 999 from outside. Boiler sooting or burning yellow? See Safety first ↓.
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Coverage: all of Haringey — N4, N6, N8, N10, N11, N15, N17 and N22, including Tottenham, Wood Green, Crouch End, Hornsey, Muswell Hill, Seven Sisters and Harringay.
What this covers: a boiler that won’t fire or keeps cutting out, no hot water or no heating, low pressure, leaking, banging or kettling, fault and error codes, and frozen condensate pipes in winter.
Not a boiler-repair job? If you want a routine service or a landlord gas check, that’s Boiler Servicing; replacing the boiler is Boiler Installation; cold radiators, a noisy pump or a system leak point to Central Heating Repair; and if you smell gas, call the National Gas Emergency Service first — don’t book online.
Renting or a council tenant? A working boiler is your landlord’s responsibility, and they must have it gas-safety checked every year. Haringey council tenants don’t use the general repairs line for gas and heating — they contact the borough’s gas contractor for their area directly. Details under Safety first ↓.
Costs: most repairs are a diagnostic fee plus the part — see what it costs ↓. Confirm the call-out charge before the engineer sets off.
Jump to: Common faults · Frozen condensate · Repair or replace? · Safety first · By district · What it costs · FAQs
Common boiler faults — and what they mean
Most breakdowns fall into a handful of patterns. Knowing the likely cause helps you describe it accurately — and tells you the few things that are safe to check yourself.
- No ignition / locks out. The boiler tries to fire and fails, often showing a fault code. Causes range from a faulty fan or ignition lead to a frozen condensate pipe in winter (see below).
- Low pressure. If the gauge sits below about 1 bar the boiler may not run; it can often be topped up via the filling loop. If it keeps dropping, there’s a leak somewhere in the system — that’s Central Heating Repair.
- Heating works but no hot water (or vice versa). Often a diverter valve that’s stuck or worn.
- A fault or error code. These are specific to the make — note the exact code, as it points the engineer straight at the area.
- Leaking. Don’t ignore a leaking boiler — turn it off and get it looked at; water and electrics don’t mix.
- Banging, rumbling or “kettling.” Usually scale built up in the heat exchanger — a hard-water problem, since Thames Water supplies the borough with hard water and the scale settles on hot surfaces.5
The frozen condensate pipe — the one you can often fix yourself
A modern condensing boiler sends a small amount of acidic waste water outside through a plastic condensate pipe. In a cold snap that pipe can freeze and block, and the boiler shuts itself down — usually with a fault code — even though nothing else is wrong. It’s one of the most common winter call-outs, and one of the few you can often sort without an engineer.
If you’ve found the external pipe iced up: turn the boiler off, then pour warm — not boiling — water along the outside of the frozen section (a hot water bottle or a cloth soaked in warm water works too), taking care it doesn’t freeze underfoot. Once the ice clears, reset the boiler following the instructions in its manual. If it won’t restart, the pipe refreezes, or you’re not confident, stop there and call a Gas Safe engineer — and don’t attempt anything involving the boiler’s gas side or casing yourself. Lagging the external pipe helps stop it happening again.
Repair or replace?
A repair is usually the right call for a boiler that’s in good order and out of warranty for the odd fault. Replacement comes into the conversation when the boiler is getting on — many last around 10 to 15 years — when the repair bill approaches a large fraction of a new unit, when parts are getting scarce, or when it’s breaking down repeatedly. An old, inefficient boiler can also cost more to run than a modern condensing one, so the sums sometimes favour replacing even a repairable unit. A good engineer will tell you honestly which side of the line you’re on; if it’s replacement, that’s Boiler Installation. For weighing it up, see Boiler Repair or Replace and, if you’re unsure which type you have, Combi vs System Boiler.
Safety first
A boiler is a gas appliance, so the safety points here are not optional.
- If you smell gas or suspect a leak: don’t switch anything on or off, don’t use naked flames or a mobile phone near it, open doors and windows if you safely can, turn off the gas at the meter control if it’s safe to reach, leave the property, and call the National Gas Emergency Service on 0800 111 999 from outside.1
- Carbon monoxide. A faulty boiler can give off carbon monoxide — a poisonous gas you can’t see, smell or taste. Warning signs include a yellow or orange flame instead of crisp blue, sooting or staining around the boiler, and more condensation than usual; symptoms include headaches, dizziness, nausea and breathlessness that often ease when you leave the house. The HSE advises fitting an audible carbon monoxide alarm marked to BS EN 50291; if you suspect CO, turn the appliance off, ventilate, get out and seek medical help.2
- Only a Gas Safe engineer may repair it. By law, work on a gas boiler or its pipework must be done by a Gas Safe registered engineer — you can check an engineer on the register.3 The only things a householder should do are top up pressure, reset the boiler, and thaw a frozen condensate pipe.
- Renting? Your landlord must keep the heating installations in repair under the Landlord and Tenant Act 1985,6 and must arrange a gas safety check every 12 months by a Gas Safe engineer, giving you the record — a duty set out in Regulation 36 of the Gas Safety (Installation and Use) Regulations 1998.4
- Council tenants don’t use the general repairs line for gas and heating. As Haringey Council sets out, you contact the borough’s gas contractor for your area directly: K&T Heating on 020 8269 4520 covers Broadwater Farm and North and South Tottenham, and Purdy on 01992 703410 covers Hornsey, Wood Green, Garton House and supported housing. There’s a separate out-of-hours emergency heating line on 020 8489 5611.7
Find a verified boiler engineer by district
How a boiler’s installed — and how easily it’s reached — tends to follow the housing.
West — Muswell Hill, Highgate, Crouch End, Hornsey, Fortis Green, Alexandra Park. Period homes often carry older boilers and awkward flue runs, and in the conservation areas there can be limits on where a new flue may go — worth knowing if a repair tips into replacement. Exposed condensate pipes on these older properties are prime candidates to freeze. Council tenants in Hornsey have their gas heating handled by the council’s contractor, Purdy.
Centre — Wood Green, Turnpike Lane, Bounds Green, Bowes Park, Noel Park. Flats above shops and converted houses usually run combi boilers, with flue and condensate routing squeezed through shared walls — so access and where the pipework runs can shape the job. Wood Green’s council tenants reach the council’s gas contractor, Purdy, directly.
East — Tottenham, Bruce Grove, Seven Sisters, South Tottenham, West Green, St Ann’s. A dense mix of estates and conversions; council tenants in North and South Tottenham contact the council’s gas contractor, K&T Heating, rather than the general repairs line,7 and some blocks run communal heating where repairs go through the building’s operator.
North-east — Tottenham Hale, Northumberland Park, White Hart Lane, Broadwater Farm. The new-build flats keep flues and condensate pipes in communal risers, and access out-of-hours can run through a concierge or managing agent; some newer developments run communal or district heating, where the “boiler” is a heat-interface unit maintained by the scheme. Broadwater Farm’s gas heating is handled by K&T Heating on the council’s behalf.
South edge — Harringay/Green Lanes, Finsbury Park, Manor House, Stroud Green. Boundary-sensitive, so confirm you’re in Haringey if you’ll need the council route; the older terraces here have the same exposed-condensate freeze risk as the rest of the period stock.
What boiler repair costs
| Boiler repair job | Typical Haringey range (editorial estimate) |
|---|---|
| Diagnostic / call-out (fault find) | £80 – £150 |
| Thaw a frozen condensate pipe | £80 – £150 |
| Replace a diverter valve | £200 – £400 |
| Replace a fan | £200 – £450 |
| Replace an expansion vessel or pump | £200 – £450 |
| Replace a circuit board (PCB) | £300 – £550 |
| Evening / weekend / out-of-hours premium | added on top |
Editorial estimate only — broad indicative ranges to sense-check a quote, not regulated rates, not market data and not a published cost survey. The part, the make of boiler and out-of-hours timing move the figure most; always confirm the diagnostic fee and rate first. If the repair approaches the cost of a new boiler, ask about replacement.
A local factor on call-outs: all of Haringey is inside the London-wide Ultra Low Emission Zone,8 and the borough’s controlled parking zones can affect where an engineer parks — both worth a quick word when you book (the Congestion Charge doesn’t reach Haringey).
Frequently asked questions
Three things: the pressure gauge, the display for a fault code, and in cold weather the external condensate pipe.
If the pressure is low, you may be able to top it up via the filling loop. If there’s a fault code, note it down for the engineer. If the external condensate pipe has frozen, it may be possible to thaw it safely.
Anything beyond that needs a Gas Safe engineer.
A one-off drop can be topped up, but if it keeps falling there’s usually a leak in the system or a failed expansion vessel.
That’s Central Heating Repair territory, and worth sorting before it does damage.
No.
By law only a Gas Safe registered engineer may work on a gas boiler or its pipework.
Topping up pressure, resetting, and thawing a frozen condensate pipe are the only safe DIY tasks.
Often “kettling” — scale built up in the heat exchanger, common in hard-water areas.
Thames Water supplies the borough with hard water, and the scale settles on the hottest surfaces.
An engineer can advise on descaling or treatment.
Your landlord.
For most residential tenancies the Landlord and Tenant Act 1985 requires landlords to keep heating installations in repair, and they must arrange an annual gas safety check under Regulation 36 of the Gas Safety (Installation and Use) Regulations 1998.
Council tenants don’t use the general repairs line for gas and heating — Haringey has them contact the borough’s gas contractor, K&T Heating or Purdy, depending on the area, directly.
Landlord and Tenant Act 1985 — Section 11
Gas Safety (Installation and Use) Regulations 1998 — Regulation 36
Repair if the boiler’s sound and the fix is proportionate.
Lean towards replacement if it’s 10–15 years old, breaking down repeatedly, short of parts, or the repair approaches the cost of a new, more efficient unit.
Areas we service in Haringey
We cover the whole borough. Towns and neighbourhoods wholly or mostly within Haringey include:
Alexandra Park, Bruce Grove, Crouch End, Fortis Green, Harringay, Harringay Green Lanes, Hermitage, Hornsey, Muswell Hill, Noel Park, Northumberland Park, Seven Sisters, South Tottenham, St Ann’s, Tottenham, Tottenham Green, Tottenham Hale, Turnpike Lane, West Green, White Hart Lane, Wood Green and Woodside.
We also cover the Haringey parts of Bounds Green, Bowes Park, Finsbury Park, Highgate, Manor House and Stroud Green, where the borough boundary runs through the area — so check your postcode if you’re near the edge.
Related services
- Boiler Servicing in Haringey
- Boiler Installation in Haringey
- Central Heating Repair in Haringey
- Emergency Plumber in Haringey
- Leak Detection in Haringey
- General Plumbing in Haringey
Related guides
- Boiler Repair or Replace
- Boiler Fault Codes
- Combi vs System Boiler
- London Plumbing Costs & Compliance Guide
A boiler breakdown is rarely a good time, but most are a known fault with a known fix — and in winter it’s often just a frozen pipe you can thaw yourself. For anything on the gas side, it’s a Gas Safe engineer by law; contact a verified one in Haringey below.
Contact verified Gas Safe engineers for boiler repair in Haringey ↑
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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 bodies and sources cited on it, including the National Gas Emergency Service, the Health and Safety Executive, the Gas Safety (Installation and Use) Regulations 1998, Gas Safe Register, Thames Water, the Landlord and Tenant Act 1985, the London Borough of Haringey and Transport for London. Source links are provided within this page where relevant.
Sources & further reading
- National Gas Emergency Service (what to do if you smell gas; 0800 111 999) — https://www.nationalgas.com/emergency-contacts
- Health and Safety Executive — domestic gas safety / carbon monoxide (CO warning signs and symptoms; fit an audible CO alarm to BS EN 50291) — https://www.hse.gov.uk/gas/domestic/faqs.htm
- Gas Safe Register (by law, only a Gas Safe registered engineer may work on a gas boiler and its pipework; check the register) — https://www.gassaferegister.co.uk/
- Gas Safety (Installation and Use) Regulations 1998, Regulation 36 (landlord duty: annual gas safety check by a Gas Safe engineer, with a record issued to tenants) — https://www.legislation.gov.uk/uksi/1998/2451/regulation/36
- Thames Water — Hard water (hard-water region; scale settles on hot surfaces such as a boiler’s heat exchanger) — https://www.thameswater.co.uk/help/water-and-waste-help/water-quality/hard-water
- Landlord and Tenant Act 1985, section 11 (landlord duty to keep installations for space heating and heating water in repair, in most short residential tenancies) — https://www.legislation.gov.uk/ukpga/1985/70/section/11
- London Borough of Haringey — Gas heating repairs for council tenants (council tenants contact the borough’s gas contractor — K&T Heating or Purdy — directly; out-of-hours emergency heating line) — https://haringey.gov.uk/housing/council-tenants/repairs/gas-heating-repairs
- Transport for London — Ultra Low Emission Zone (London-wide ULEZ covers all of Haringey) — https://tfl.gov.uk/modes/driving/ultra-low-emission-zone