Please can some one help, with my boiler it keeps on coming on every hour and runs up for around 30 - 40 secs, even if nothing is being called for, i have had the people back round several times to cure the problem but to no avail, also i have had a C&M engineer come round but he has no idea how to stop it, i know it is something to do with comfort mode because i know of somebody who has same make of boiler but a year older than mine but they have a button to turn the comfort mode off, any help would be gratefull.