Ideal Combi explosive noise


I have an Ideal Icos Combi boiler and few days ago I realized that it started to produce very loud, “explosion” like noise each time I open a tap with hot water. It is scary, but boiler is working- it still provides hot water. Can someone advice if it is sth serious and how it should be fixed?



Hi George

This is a pretty common fault on Icos boilers. An “explosive” noise is being produced because there is a lot of gas released by the ignition leads. Gas valve and speed fan adjustments will need to be done, in some cases flame sensors need to be replaced. You can find info how to do it troubleshooting section of this page, but if after reading you feel somehow uncomfortable with doing it yourself, call for the specialist.