how can i fix my boiler modena 80 ferroli?

when i switch from radiators to hot water sometimes the pilot light wont light untill i reset the boiler then sometimes it only ignites for 10 to twenty seconds other times its alright would be glad of any help
alex currie, March 2006


done
when heating goes water pressure drops and dhw ch wil
not go on until i pressure the boiler again

jimmy, November 2006
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