Dependable HeatingDependable Heating
Call 07883 293 725Quick Quote Online

Boiler Repair

Boiler showing a fault code or just gone quiet? Get it diagnosed, not guessed at

Lockouts, low pressure, no hot water, heating that will not come on, leaks, noises and the fault code on the display. Gas boiler repairs across London, diagnosed with a flue gas analyser and a multimeter rather than a parts lottery, and priced before the repair starts.

Quick Quote OnlineCall 07883 293 725
ExcellentMany five-star reviews
Boiler Repair

What people say once the heating is back on

Reviews

Excellent

Rated by London homeowners and landlords

  • Boiler repair, flat

    Boiler locked out on a Sunday evening and the flat was freezing by Monday. Explained the fault code over the phone, turned up when they said, had the part on the van. Heating back on the same visit.

    Sarah M.Reviewed on Google

  • New combi boiler

    Got a written quote with the boiler model, the flush and the filter all listed, nothing added later. Two days of work, tidy, and they talked me through the controls before leaving.

    Daniel O.Reviewed on Google

  • Landlord gas certificate

    Needed a CP12 quickly for a tenancy renewal. Booked for the next morning, the tenant said the engineer was polite and quick, and the certificate was in my inbox that afternoon.

    Priya K.Reviewed on Google

  • Blocked kitchen drain

    Kitchen sink had been slow for weeks and then stopped altogether. Cleared it, showed me the fat build-up on the camera, and gave honest advice on stopping it happening again.

    Tom R.Reviewed on Google

  • Radiators cold at the bottom

    Three radiators were cold at the bottom however much I bled them. Power flush took most of a day and the difference is obvious, the whole house heats up far faster now.

    Helen W.Reviewed on Google

  • Leak under the bathroom floor

    Water was coming through the kitchen ceiling and I feared the whole floor coming up. They traced it to one joint on the bath waste and only lifted two boards. Very relieved.

    Marcus L.Reviewed on Google

  • Bathroom refit

    Full bathroom, old one stripped out and a walk-in shower put in. Plumbing, tiling and electrics all handled by the same people, so nothing fell between the gaps. Really pleased.

    Aisha B.Reviewed on Google

  • Annual boiler service

    Straightforward service, no upselling. Checked everything, cleaned the condensate trap, adjusted the pressure and explained what the readings meant. Booked again for next year.

    George P.Reviewed on Google

What the work involves

A boiler breakdown has a way of arriving on the coldest morning of the year, and the temptation is to call whoever answers first. The trouble with a rushed repair is that a boiler has perhaps a dozen components that can produce the same symptom. No hot water on a combi might be the diverter valve, the plate heat exchanger, the flow sensor, the pump or the printed circuit board. Changing them in turn until one works is expensive, and it is how a repairable boiler ends up being written off.

Dependable Heating repairs boilers the slower, cheaper way: read the fault log, test the component the evidence points to, confirm it, and then price the repair. The common parts are carried on the van, so most repairs finish on the first visit. Where a part has to come from the manufacturer, the boiler is left safe, the price for the part and the return visit is agreed, and the return is booked.

Boilers that are past economic repair are called that, with the reasons, and a boiler replacement quoted properly rather than on the doorstep. Coverage runs across the London areas we cover. Gas boilers may only lawfully be worked on by an engineer on the Gas Safe Register, and every repair is held to that.

Quick Quote Online

01

Emergency boiler repair

No heating or hot water in a household with young children, someone elderly or someone unwell is treated as urgent, and so is a boiler that is leaking, making an unfamiliar banging or has tripped the electrics. Say what the display shows and what the boiler is doing, and you are given an honest time for the visit. A boiler that has locked out because the pressure is low can often be got going over the phone by topping up the system, and if that is all it needs, you are told so rather than sent an engineer.

If there is a smell of gas, soot around the case or a pilot flame burning yellow and lazy, switch the boiler off, open windows and call the National Gas Emergency number on 0800 111 999 before anything else.

02

Same-day diagnosis and repair

Diagnosis starts with the boiler's own memory. Every modern boiler logs its faults, and the sequence of codes over the last few days usually tells the story before the case is off. From there it is measurement: gas pressure and flue gas readings for combustion problems, resistance and voltage tests for sensors, fans, pumps and valves, pressure and flow checks for the water side. The component that fails the test is the one that is replaced.

The van carries the parts that fail most: fans, pumps, diverter valves, pressure sensors, ignition electrodes and leads, expansion vessels, automatic air vents, PCBs for the common makes, printed circuit boards for the common makes, condensate traps and gaskets. Where the boiler is a less common make or the part is model-specific, it is ordered, and the boiler is left safe in the meantime.

03

Boiler faults and common breakdown causes

Low pressure lockouts come from slow leaks or a flat expansion vessel. No hot water but heating works on a combi is usually the diverter valve or a scaled-up plate heat exchanger. Heating works but the radiators stay cold is more often a system fault, a stuck zone valve, a failed pump or a sludged system, than the boiler itself. Ignition faults come from electrodes, gas valves, fans and flue problems. Kettling, a rumbling as water boils on hot spots, means scale or sludge in the heat exchanger. Fan faults are bearings wearing out, often heard as a whine before the boiler stops. Frozen condensate pipes shut boilers down in cold snaps and are cleared with warm water and then re-routed or insulated so it does not happen again.

04

Pricing and call-out

The price for the visit and the diagnosis is agreed when you book, and the price for the repair is agreed once the fault is confirmed, before the part goes in. Where a repair is done on the first visit, the parts and the labour are on one invoice with no additions. Where a return visit is needed, that is quoted before the part is ordered. If the honest advice is that the boiler is not worth repairing, you are told that with the diagnosis, and you owe the diagnostic price only.

05

Parts, labour and replacement components

Repairs use manufacturer parts or manufacturer-approved equivalents, because a pattern fan or a cheap PCB fails early and takes the labour cost with it. Every replaced part is left for you to see if you want it. Where a part is obsolete, which happens on boilers over fifteen years old, you are told which part, whether a reconditioned unit is available and what that means for the boiler's future.

06

Safety and compliance

Any repair that opens the combustion side of a boiler finishes with a flue gas analysis to confirm the burner is combusting correctly, and any repair on the gas side finishes with a tightness test. The readings are recorded on the job sheet. If a repair reveals something that makes the boiler unsafe, it is classified using the industry procedure and made safe, and you are told what is needed to put it back into use.

07

Boiler brands and system types

Worcester Bosch, Vaillant, Ideal, Baxi, Viessmann, Glow-worm, Potterton, Alpha, Intergas, Ferroli, Vokera, Main, Ravenheat, Saunier Duval and the rest. Combi, system and heat-only boilers, open-vented and sealed systems, and the back boilers that still heat a surprising number of London terraces. The engineers carry the fault-code references and the service manuals for each, and the diagnosis is done to the manufacturer's procedure rather than from memory.

Want boiler repair priced for your property?

Quick Quote OnlineCall 07883 293 725

How a job runs

How a boiler repair runs

Diagnosis first, price second, repair third. It is slower than swapping parts and it is cheaper.

  1. Reading the job through before the visit

    01

    Tell us the symptoms

    The fault code, what the boiler is doing, the make if you know it. Low pressure can sometimes be sorted over the phone.

  2. Checking the plans and paperwork

    02

    Diagnosis

    Fault log read, the suspect component tested and confirmed with instruments, not swapped on a hunch.

  3. Engineer drilling a wall for a fixing

    03

    Price and repair

    The repair priced before the part goes in. Common parts fitted from the van; rarer ones ordered and the return booked.

  4. A finished boiler and cylinder installation

    04

    Test and record

    Combustion checked with an analyser, gas tightness confirmed, pressure set, and the readings written on your job sheet.

Quick Quote Online

No heating, no hot water, or a code on the display? Get it looked at

Send the fault code and the symptoms. An engineer calls back with a time and the price for the visit.

Quick Quote OnlineCall 07883 293 725

Where we work

Boiler repairs across London

Breakdown calls come from every postcode, and the engineers are routed by area so a morning in Islington does not become an afternoon lost crossing to Croydon. The towns below are covered.

  • London
  • City of Westminster
  • Islington
  • Chelsea
  • Battersea
  • Holloway
  • Brixton
  • Peckham
  • Fulham
  • Archway
  • Shepherds Bush
  • Canary Wharf
  • Stamford Hill
  • Willesden
  • Cricklewood
  • Putney
  • Streatham
  • Stratford
  • Catford
  • Canning Town
  • Acton
  • Wimbledon
  • Tottenham
  • Finchley
  • Leytonstone
  • Walthamstow
  • Mitcham
  • Wembley
  • Beckenham
  • Brent
  • Morden
  • Edmonton
  • Eltham
  • Croydon
  • Barking
  • Ilford
  • Carshalton
  • Enfield Town
  • Chingford
  • Greenford
  • Harrow
  • South Croydon
  • Hounslow
  • Welling
  • Southall
  • Heston
  • Surbiton
  • Sutton
  • Becontree
  • Purley
  • Borehamwood
  • Ewell
  • Bexley
  • Hayes
  • Dagenham
  • Feltham
  • Banstead
  • Cheshunt
  • Esher
  • Romford
  • Dartford
  • Watford
  • Uxbridge
  • Staines
  • Leatherhead
  • Hatfield
  • Redhill
  • St Albans
  • Grays

Jobs that often go with this one

  • Boiler Service

    Boiler Service

    An annual boiler service that checks combustion, gas rate, flue, seals and safety devices, keeps the manufacturer warranty valid and catches faults early.

  • Boiler Installation and Replacement

    Boiler Installation and Replacement

    A new combi, system or heat-only boiler sized for the property, fitted with a filter and flush, commissioned and registered, with the old one taken away.

  • Emergency Plumber

    Emergency Plumber

    Burst pipes, water pouring through a ceiling, a stopcock that will not turn or no hot water on a cold morning. Tell us what is happening and we get someone moving.

Resources

Guides worth reading before the visit

FAQ

Boiler Repair: the questions people ask first

What does the fault code on my boiler mean?

Each manufacturer uses its own codes. Low pressure, ignition failure, fan fault, overheat and flue fault are the common ones. Send the code and the make and you are told what it points to and whether it is something you can reset yourself.

Can I reset my boiler myself?

Once, yes. If it fires and runs, keep an eye on it. If it locks out again within a day, something is causing it and repeated resets can cause damage; that is the point to book a repair.

How long does a boiler repair take?

Diagnosis takes around half an hour. A repair with a part from the van is usually finished within an hour or two of arriving. A part that has to be ordered means a second visit, which is booked before the engineer leaves.

Is it worth repairing a boiler that is over ten years old?

Often, yes. Age alone is not the test; the condition of the heat exchanger, the availability of parts and the cost of the repair against the boiler's remaining life are. You get that assessment with the diagnosis and the decision is yours.

Do you repair boilers you did not install?

Yes, any make and age, provided it is safe to work on and parts can be sourced.

What if the problem is the radiators rather than the boiler?

That is common: a stuck valve, a failed pump on the system or a sludged circuit all look like a boiler fault from the sofa. The diagnosis covers the system as well as the boiler, and if the fix is a flush or a valve rather than a boiler part, that is what is quoted.

Anything not covered here is answered on our contact page, and the longer reads on boilers, radiators and leaks live in our heating resources.

Quick Quote Online

ExcellentMany five-star reviews

Send the fault code and what the boiler is doing

The make, the code on the display, whether there is any heating or hot water, and whether the pressure gauge is in the green. That is enough for a time and a price.

  • A written price before any work starts
  • Boilers, gas, plumbing, drains and bathrooms under one roof
  • London and the towns around it

Quick Quote Online

This form is secure. Your details are only used to send your quote, never shared.

Quick Quote OnlineCall us