why is my central heating boiler making loud explosions on ignition it is intermittent. balanced flue gas?

Question

it seems to be more at night time when it is loudest

Answer 1

call a srvice engineer right awayit needs checking.

Answer 2

To start you did the right thing to call the technicians, second try to warm a bit of brandy and put some honey in, I don't think you have any problem with the boiler must be some connection from the boiler to the heating or/and the thermostat I have to draw them (boilers) on the plans and some times the connections, Robert C might be right as well. They will have this wee machine that would read what's the problem and will know right away. I feel so sorry for you, hope they can fix it soon as they arrive. And if not just warm a bit more of Brandy he he. Wish you all the best and give you a star for good luck. Kisses and hugs.

Answer 3

This sounds like "kettling". This is due to sludge forming a hard crust in the base of the boiler that traps water in pockets. This leads to localised boiling where the flame impinges on the underside of the heat exchanger. The trapped steam forces its way out to other parts of the boiler causing hissing and sometimes knocking as it does so. In extreme cases it sounds like small explosions. The whole system should be properly flushed out with an appropriate chemical treatment and equipment. The system is then refilled with an inhibitor which should prevent further silting up of the system. The sludge can lead to reduced efficiency in the radiators and possibly corrosion and leakage. This treatment should be done by a professional.

Answer 4

Anjie68MK is correct. It sounds like there is too much gas in the ignition chamber when it finally ignites, hence the “explosion”. This may be because the igniter is faulty or the fan is not working correctly. Get it checked out by a pro, very dangerous so don’t take any chances. Its worth taking out insurance to cover this type of thing.

Answer 5

Pilot is to small delayed ignition of the main burner. Basically it is in need of a proper service

Heating engineer 40 yrs+

Answer 6

a couple of thing may be your problem,,,,, as someone stated ,,, your pilot could be to small,,,but i don't think this is your problem,,, more than likely you have a crack in the heat exchange,, which will need repaired quickly,,, most heat exchanges in a furnace or boiler has a 20 year warranty,,, there is one other possibility,,, when the fire is burning look back in to the burning flame and see if one of your burners has melted,,,, it is usually the deflector on the left side burner that this happens to,,,don't know why ,,but it just is the most common one,,, once i think about it that may just be your problem,,, ,,,,look at the deflector while it is burning,,,, hope this helps,,,good luck,,

Answer 7

it sounds like it is letting more gas out before it ignites and when it does it lights all the unburned gas and boom matbe some one needs to check and see if the igniter is close enough to the gas outlet or check and see if the igniter is working right. it's not right if it was to not light for a long time it could explode make sure you have good fire insurance

Answer 8

1

Answer 9

Please get it serviced - when was the last time it was done?
Gas is so bad, with Carbon Monoxide being undetectable it is not worth the risk of taking advice about what it could be on this site.

Get a corgi gas registered person out to check it over.

Please!.

Answer 10

Get it serviced .... the ignitor is faulty and there is too much gas being released prior to ignition ...

Answer 11

Needs a service asap