I have a hotpoint aquarius WF250 1500 spin. The

What is the model number? Look inside the door area.

You say it stops half way through cycle (if I have read it right), especially when fast spin starts. Does it stop anywhere else (in wash cycle or rinse cycle)?

I would check the main filter in the sump (pipe from drum to drain pump) and ensure pump itself is not blocked which could cause the pump out time to be exceeded and thus stop the program. A faulty pressure switch could also be responsible.
I would also check the tacho on the motor and connections to main board at bottom of machine near to motor.

Disconnect machine by pulling out plug and wait 10 minutes for capacitors to discharge before doing anything, to protect yourself against residual voltages.

From a retired engineer who owns one of these machines.

is it spinning and craccleking,,carbons faulty in motor ;;will work on spin but not lower voltage wash?
change carbons,, use genuines,only

half way through the cycle all the lights start flashing then it makes a loud noise when spinning

common problems with timer which work like a clock and goes though the cycle, bad timer will cause it not to go through its cycle. it very cheap and easy to replace everything is all plug in.

check solaniod valve on water pump

hi there......most likley cause is a blocked or defective drain pump....if the water cannot get out of your machine due to the faults above it wont rinse drain or spin

regards Sir Galahad

Hi my Hotpoint WF740 keeps flashin H20. Does anyone know why please?

half loads will vibrate more than full load
check transit bolts are removed
if vibration persists, then fault is probably shock absorbers worn

The lights are set off by the balance sensors.And if your balance sensors are  stopping    it from spinning than you first have to make sure the washer is level.You  could have bad Shocks and a bad electronic control board,.