This whirlpool dishwasher keeps bleeping with 4 flashes on the start led (Drainage Fault).There is no problem with drainage or any thing else (even done test sequence and no fault shown). Took out water indicator which was clean, dismantled it and checked switch which seemed ok and put back. Machine worked ok after that but have had call to say its doing it again. Is it a case of renewing the water indicator or could it be something else?
Thanks
Subs