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We had the problem before we drained the system (we did this after reading some posts on this site). Sometimes it ignites - most of the time it doesn't.

We have a Ariston Dia 24 MFFI CE (about 7-8 yrs old). We are having problems with it igniting. If we turn the heating off and the water temp to minimum it will generally ignite, but if we turn the water temp above halfway then we get a "whooshing" sound from the boiler. We are not able to...