Banging noise from Glow-worm boiler

[jackeroo]

You should see an increase in pressure by about 15%-20% when pump is running this would tell you the pump is working correctly.

 

[dan_the_plumber]

Are the flow and return pipes 22mm or 15mm?
Single pipe or two pipe system?

 

[Dake205]

This boiler is about 7 years old, property is about 15-20 years old, flow and return are 22mm and two pipe system, combi boiler replaced system boiler in kitchen, cylinder removed from bedroom, old pump/valves removed and pipes connected, drop fed system in 10mm hep.

 

[dan_the_plumber]

10mm systems can sometimes struggle to get rid of heat. Have you got all radiators on? You’re best off maintaining flow through system by have rad valves open to at least 3, then relying on the room stat to bring the boiler on and off.
Also, Set the flow temp on the boiler to 60 degrees. Make sure all isolation valves under the boiler and on magnetic filter are fully open. All things you can do yourself without getting too invasive.

 

[JusKel]

When it starts banging again, check that the pump hasn't stopped.