Does My Gas Boiler Need Regular Servicing? Read Our Checklist!

Wondering whether an annual boiler service is necessary or an unnecessary cost? Use our Boiler Service Checklist to discover whether you would benefit from having regular gas boiler servicing and gas safety checks.

Short on time?

The quickest and stress-free way to get your boiler serviced is to call us out. Well make sure your boiler is cleaned and working efficiently, plus highlight any potential future problems. Contact us for a no-obligation phone consultation/quote. We cover North London, West London, Watford, Hertfordshire and Middlesex locations.

Regular boiler servicing ensures that problems don’t crop up when you least want or expect them. Especially in winter, no hot water or heating can cause severe disruption to you and your families lifestyle.

An annual service will detect small leaks or minor installation defects. When detected early on, means they can be put right before they develop into major issues.

Boilers that remain in faulty conditions for many months or years can then lead to much worse problems. In addition, these problems can be potentially life-threatening conditions.

The good news is that it is possible to tell if a gas appliance is experiencing a problem with these tale-tale symptoms.

Boiler Service Checklist

Is your boiler playing up? Signs that a gas appliance might be about to stop working include:

  • The pilot light goes out regularly
  • You have to reset your boiler regularly
  • You keep adding water pressure to your central heating system.
  • Radiators are not heating up evenly
  • Hot water temperature fluctuates when in use
  • Boiler becoming suddenly noisier
  • There is evidence of soot or staining on the boiler

It’s always a good idea to get boilers serviced early because:

  • It’s definitely safer
  • It’s usually cheaper
  • Your boiler is less likely to break down
  • No sudden cost surprises

A regular, annual gas boiler service is essential to ensuring any developing issues are discovered and dealt with quickly and efficiently. Servicing is also essential for safety and energy efficiency. It maintains boiler health and ensures your boiler’s long life. As well as prevents system breakdowns.

What can you expect from an annual boiler service?

Preliminary boiler visual check:

  • Ask the customer whether there are any known problems or issues with the central heating system boiler and controls
  • Carry out a visual check on the appliance / boiler, location and central heating installation is to current standards and meets manufacturer’s requirements
  • Check
    • for any damage before starting work on it
    • the appliance is working correctly, including consumer controls and the safety devices
    • the flame is burning correctly (if possible)
    • electrical wiring is safe
    • for correct clearances from combustible materials and access to boiler, meets manufactures requirements
  • Examine gas supply pipe work for correct installation and clearances
  • Check for correct ventilation to the room containing the appliance if ventilation is a requirement and check boiler manufacturer’s instructions to suit

Central heating servicing procedure:

Before running the boiler

  • Carry out full gas tightness test on gas supply before removing any parts from boiler.
  • Remove main burners, clean and inspect for damage
  • Check integrity of boiler casing seals and combustion chamber for corrosion or damage and replace seals or gaskets if needed. If parts are required advise customer on costs
  • Clean and inspect gas injector(s)
  • Dismantle and clean boiler pilot assembly and gas injector/spark electrodes Check condition of ignition leads and replace necessary. If parts are required advise customer on costs.
  • Clean the heat exchanger and check for leaks or soot
  • Refit and assemble parts and check seals
  • Test disturbed gas joints for leaks. And again carry out full gas tightness test on gas supply.
  • Before running boiler carry out test on all gas flame failure and safety devices fitted to boiler i.e. Check operation of thermocouple (flame supervision device). Flame recognition devices

Checks when boiler is running

  • Once boiler is running again check flame picture for correct operation and then after about five minutes check inlet working gas pressure should be around 20 Miller bar then check gas burner pressure or carry out a gas rate to measure how much gas the boiler is burning and if it’s within manufactures requirements. Adjust if necessary
  • Inspect/test flue for faults/correct operation by means of flue flow test and spillage test or by using a gas flue analyser
  • Inspect flue terminal for correct location and termination size and position.
  • Check water content in system or pressure in system whichever is applicable and bleed all radiators and pipework
  • Check the system for correct heat up all round system, also looking for faults or leaks or any controls which have become damaged or are leaking or might pose a problem in the near future and advise customer

Post checking

  • Fill in gas safety certificate, landlord gas safety certificate or service certificate
  • Apply the Industry Unsafe Situations Procedure if necessary issue warning notices or safety advice if applicable.

Servicing Guidelines

Manufacturers often provide instructions and guidelines on how to carry out servicing on their appliances which your heating engineer should adhere to, thus ensuring boiler manufacturer best-practices are followed.

Boiler servicing takes a minimum of around an hour for a combination boiler and in some cases can take a lot longer, especially if you have a back boiler with a gas fire. A gas fire, although appearing to be a simpler appliance, usually takes around the same amount of time because the flue and chimney system needs thorough checking.

So now you have a comprehensive boiler service checklist that will hopefully prove that an annual boiler service is necessary and will help you save money in the long term and inconvenience of boiler breakdowns.

What next

Book your appointment by contacting us today. We cover areas in London, Watford, Hertfordshire and Middlesex.

Disclaimer: The information contained on this website if for general information purposes only. You should not rely upon the material or information on the website as a basis for making any decisions or actions and we don’t accept liability for anything you chose to do with the information.

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In London, Watford, Hertfordshire and Middlesex locations

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We'll take your address details and come at a time to suit you. We carry a range of common spare parts so we can usually get things working with one visit.


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