There are many different boilers on the market these days. Below is a general procedure for carrying out a service of a central heating boiler. Note that some of these procedures may not be applicable to your boiler type but is a good guide to the right services.

Please not this is only a guide to how a boiler services should take place and only should be carried out by a corgi registered installer

Step 1
Carry out preliminary checks

Light the boiler and put in to full operation and that all functions are working properly.
Check that the right ventilation has been provided.
Check flue terminal location and free of defects.
Look for signs of spillage (if applicable).

Step 2
Servicing procedures

Isolate gas.
Remove casing.
Remove the main burner assembly and clean and check,
(a) main burner.
(b) injectors.
(c) electrodes.
(d) thermocouple.
(e) gas valve.
(f) pilot.
Clean the flue ways.
Check and clean the fan (if applicable).
Re-assemble the appliance.
Check appliance seals and joints (if applicable).

Step 3
Final checks

Ignition of boiler.
Electrics.
Safety device working properly.
Controls working properly.
Gas connection.
Flue flow test (if applicable).
Spillage test (if applicable).
Burner pressure too manufacturers instructions.
Gas rate set too manufacturers instructions.
Leave the site clean and tidy condition.