hi all fitted this boiler last week its a combi as you may know only difference being the rads and towel rails were zoned to be used seperately with hw on demand. the sparks wired this not me! when you turn the rads on on the prog let it fire up the flame and radiator display comes up then turn it off on the prog the flame goes off as it should but the radiator symbol starts flashing then if you try turning it on again it wont fire without resetting though the whole time the hw will fire. i have checked the manual but nothing is said. has anyone come across this before?