I thought I’d post this problem I had. At the start of the cycle my Aqualtis would spin the drum and fill for about 10 seconds, then just sit there counting the time down. After about 10 mins it would throw up an H20 fault.
Taking advice, I replaced the motor and the water inlet solenoids.
After the bits I decided it must be a wiring problem. So I got out the wife’s sewing set and took out a needle. I unplugged the plastic connector block between the CPU and the solenoids and teased out the contacts a little. Hey, Presto, the machine sprang back into life! Bad connection that cost me a new motor and set of water inlet solenoids!
Disclaimer: It was a tricky problem and I wouldn’t advise you trying it unless qualified to do so because it could go horribly wrong.