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Sometimes when my gas boiler starts it it makes a loud “thud” or “bang” sound and sometimes it does not. When I had an engineer out checking out the gas values, I asked him the same question and he said it happens from time to time and is nothing to worry about, but it can be very annoying. Is there any way to stop it?
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There is a tank directly above my boiler which keeps leaking as though it is boiling over and my central heating makes a very loud bang occassionally like its going to blow up. Any ideas what this could be?...
Posted in Discussion
Its the expansion and contraction of metal parts as it warms or cools. no big deal. Don’t like it, spend more money on a better unit.
This could be delayed ignition of the burners but a good technician wont let that go without repairing.
Could also be the flame popping back into one of the burners which can be repaired by cleaning, adjusting or replacing.
The technician should have told you exactly what is causing this if its nothing to worry about.
I think you ended up with a tech that wasn’t sure of how to take care of that problem.
Get another technician out to look at.
Check to make sure there are no ‘dead legs’ in the system. Sometimes old pipework is left in the system still connected but not of any use. If there is and it is not supported properly this can cause a knocking sound.