A Guide To Boiler Servicing

11 May. 2019

Written by Neil Marsh MCIPHE RP RHP EngTech

How a Gas Safe registered engineer may approach a gas or LPG boiler service will vary. There are key checks and actions required for all boiler makes and models that Gas Safe registered engineers should undertake when servicing a boiler…

We have put together a detailed guide below which explains what your boiler service engineer should be doing when they service your boiler.

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Mandatory checks and undertakings during your boiler service:

  • The boilers general condition should be inspected. Where it has deteriorated, or in need of repair, you should be notified of such faults  or potential faults. 
  • The boilers location, flue and the clearances around each should be checked to ensure that the boiler is fully accessible and maintainable and products of combustion discharge safely. 
  • The boilers gas pressures should be checked where applicable and/or a gas rate should be undertaken to determine if the boiler is burning the correct amount of gas
  • The boilers ventilation requirements should be checked to see if they are adequate. 
  • The boilers flue should be inspected to ensure that it is free from damage, obstruction and has been installed and supported correctly along its full length. 
  • The products of combustion should be checked with a flue gas analyser to confirm that the combustion process is working within parameters and no dangerous levels of carbon monoxide exist.
  • Flue flow and spillage checks should be undertaken to ensure that the flue is operating in a safe manor. This generally applies to open flues. 
  • All safety devices and controls on the boiler should be checked to ensure they are working correctly.
  • The burner should be inspected and checked for defects. Some boilers have pressure tests which avoid the need to visually inspect the burner so long as the pressure readings are correct. 
  • The ignition process should be checked to ensure that the boiler is igniting correctly and that the flames being produced are sharp and blue. It is not possible to do this on all appliances depending on their design. 
  • The main heat exchanger should be checked to ensure it is clean and other defects, such as cracks/splits.
  • The electric supply to the boiler should be checked to ensure that the boiler is correctly wired and has the appropriately rated fuse in the spur/socket. 
  • Any casing seals should be inspected to ensure they are still in good condition and not passing.
  • The pump should be checked to make sure that it is working correctly and no blockages exist which prevent the boiler from working normally.
  • Any condensation traps should be cleaned from debris, although due to the poor installation of some boilers this is not always possible.
  • Expansion vessels should be checked to ensure that their internal air pressure is adequate and no discharge is visible from the pressure relief valve (on sealed systems only).
  • The system should be set to the correct cold pressure (on sealed systems only).
  • The condensate pipework should be inspected to ensure that it is of the correct size and insulated where required (condensing boilers only).
  • CO2 values should be checked and calibrated to within the manufactures tolerances where required.
  • A general inspection of the boilers components should be undertaken to ensure no signs of distress of failure are present.
  • Any other requirement specified in the manufactures instructions as part of the servicing regime. 

Different service providers may or may not choose to do the following things: 

  • Some engineers/companies will clean out magnetic filtration units, however others will avoid this as some are prone to leaks following being disassembled for cleaning/servicing and this can lead to further chargeable work.
  • Some engineers/companies will check all of the radiators to ensure they are heating fully, why others may not unless you advise them of particular faults/issues with radiators.
  • All engineers/companies should be visually inspecting hot water cylinders to ensure that where unvented cylinders are present, they are free from poor installation that could contribute towards a steam gas explosion.

Forthright are high quality boiler service provider who offer annual boiler services in Hereford, Worcester, Bromyard and the surrounding areas at competitive rates. See our “Rates & Payments” page for up-to-date costs and contact details to book a service.