I have found the simplest way to clear an air lock it to take both hoses of
the washing machine & connect 1,ONE hose to both outlets, 1 hot & 1 cold,
then turn on the hot fully & slowly open the cold, if there is an air lock
you will hear much grumbling from the cylinder, when the grumbling stops,
then turn off the cold, then the hot, & try the hot tap over the sink.
If it is a bit better but gets worse then repeat the above for a bit longer,
could be your hot feed from the cylinder goes up for a while before it goes
down to the kitchen, hence the air lock.
When I fitted kitchens I would always check the flow in front of the client
BEFORE starting work, then if it was poor when I started they had no ground
to complain if it was poor when I finished
Otherwise they will always say it was OK before you started work
Click to see the full signature.