Every boiler manufacture sends out a stinker, but you can only go on boiler trials in the market, on all types of systems to see if they stand the test of time and British heating systems are the hardest to please.
The Logic so far seems to be holding its own but no one can really comment...
Hi
They have Hot Water priority, is there any leaking taps in the house.
Shut off the valves to hot water and see if it switches to heating.
Press i and - to see if it brings up a fault code.