Annual Service

First up, most boiler engineers recommend annual servicing as being adequate for the majority of household boilers. The professional doing the boiler service should be Gas Safe Registered (this accreditation has replaced the commonly-known CORGI certificate).

Visual Inspection

The service should start with a visual check that establishes that the boiler, its installation and its positioning, comply with the rules laid out in building regulations, electrical regulations, gas-safety regulations, water by-laws, installation instructions and British Standards. All must comply with present legislation.

Boiler Pre-service check

The next part of the boiler service is the pre-service check. To do this the engineer will fire the boiler, check the its basic operation and identify any initial faults.

Examination of internal Parts

The casing should then be removed (something you, as the householder, should never do yourself). At this point the main components will be examined to see they are clean and free from damage. These components include the main burner, the main injector, the heat exchanger, condense trap, the spark centre probe and the seals and fans. Also part of this section of the boiler service is the checking of all electrics for overheating, the cleaning of all inside surfaces, inspecting all pipe work (water & gas) and joints, and very importantly, making sure the flue terminal is unobstructed.

Gas Analyser Check

Next, the gas valve should be checked with a flue gas analyser to make sure the boiler is combusting properly.

Fault finding and Associated Costs

If any of these tests show a fault, the engineer should inform you of any additional costs that the repairs will incur. It is widely recommended that the parts are only replaced with those also made by the manufacturer of the boiler, to ensure that they’re compatible.

Tightness Test

Next, the engineer should carry out a gas-tightness test to establish if there are any leaks in the system.

Boiler re-assembly

The casing of the boiler should then be carefully replaced.

Service Time

If you are unsure about the length of time that your boiler service should take, most experts state that a basic service will last around half an hour.

Service Report

The final step is the service report. This is your chance to compare what the engineer has stated they have done, with what has actually been completed. Only sign-off the report if you are satisfied with the work done compared to the checklist.