crappy day today.worked all day in the pouring rain!its been relentless here in the north west!

whats happening is i have to have my pump on full blast on my digital controller to get even a moderate flow at brush end.the pump is not shutting off when i turn my tap off at pole end for ages(about a min,,sometimes longer).then even though pump on full im getting a dribble at brush end sometimes.
pump and controller are about 18 months old.battery about 6 months old.it was working fine yesterday!i must of wasted an hour today faffing around with it.
ive changed the fuse and cleaned out the filter but to no avail.battery fully charged reading 12.6.
i tried to set up AUTOCAL but it kept coming up ERR(error) so i tried to adjust it manually and it made no difference whatsoever.i also unreeled all 100m of hose and checked for kinks.none!
could it be a faulty connector to inside reel?air in the system?
i must admit it was frustrating me today as well as getting drenched by the constant downpours!!

any ideas lads?