Boiler Bangs or Booms on Start-Up
A distinct bang or whump when the burner lights, rather than a smooth ignition..
A distinct bang or whump when the burner lights, rather than a smooth ignition.
What is actually going on
A distinct bang or whump when the burner lights, rather than a smooth ignition.
The realistic causes, in order
Delayed ignition allowing gas to build before it lights, usually electrode or gas valve related A partially blocked burner affecting the flame pattern Incorrect gas pressure or an appliance never correctly commissioned
What we test on site
Ignition sequence observed directly, timed against the manufacturer's expectation Burner and injector condition Gas rate and full combustion analysis
Worth checking today if you have a boiler that bangs on start-up
- Turn the boiler off and report it rather than continuing to use it
- Note whether it happens on every start or only from cold
- Delayed ignition is a combustion safety issue. It should not be lived with, and the appliance should be checked before further use.
Who does the work
- Gas Safe registered engineers — registration 554328
- Worcester Bosch accredited installer
- John The Plumb Ltd, company registration 10026483
Get a boiler that bangs on start-up diagnosed properly
Cleaning, electrode replacement and correct commissioning normally restore a smooth light-up.
Questions we get asked
What causes a boiler that bangs on start-up on a gas boiler?
Delayed ignition allowing gas to build before it lights, usually electrode or gas valve related
What normally puts a boiler that bangs on start-up right?
Cleaning, electrode replacement and correct commissioning normally restore a smooth light-up.
Is it safe to keep using the system with a boiler that bangs on start-up?
Delayed ignition is a combustion safety issue. It should not be lived with, and the appliance should be checked before further use.