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ICOS HE15- Boiler ignition banging?

Have Icos HE15 boiler. 2+ years old. Regularly serviced. Works OK on heating + hot water but has a problem with hot water only. On hot water the boiler cuts in/out on thermostat as hot water tank temperature stabilises. Sometimes after boiler has been off for 5-10 minutes and heat is required for hot water, the fan starts and ignition sequence commences but there is a boom as gas ignites.
There are no fault messages on LCD display.
Any suggestions
BarryD, June 2009
Ignition Gap, Burner Dirty, etc etc.

You should get the boiler checked by an RGI

www.elanar.co.uk, June 2009