Boiler maintenance services:

inspect heat exchanger test temperature rise across the heat exchanger
lubricate the circulating pump as required Clean burner/Combustion Chamber
examine zone valves inspect cold water input and hot water output
check expansion tank Go over all of the gas components e.g. thermocoupler, gas valve etc.
Check for gas leaks on the piping to the Boiler Examine CO and gas leak
Examine gas pressures Examine hot water and central heating thermostats
Examine wire connection and switches Check pilot light assemblage and also clean/adjust if required
Burners: check air to gas ratio to see that there is a right mixture for efficiency Check flame pattern to make sure it is the proper height and colour
Will clean and adjust burner if required