Hotpoint dishwasher H error code with beeps

[wildtypitch]

Hi, I have a hotpoint hio 3c22cw dishwasher that seems to go with water then beep consistently every 2 seconds or so. The panel displays a H. Anyone know what this means or where I can get a service manual. Hotpoint seems to be a very closed company. Can't find it anything from searching.

 

[Wayners]

His old is machine?


Looked online Here and saying pump or pressure sensor.
Pumps normally play up first after 5+ years and are normally an easy swap.
Pressure sensor you can blow down rubber pipe to clear and if that don't work replace. Never blow in the pressure sensor though!

Sometimes you lay machine on side to gain access just like a washing machine. Dishwashers are harder to work on than washing machine I find.

 

[wildtypitch]

Thanks for the reply. I'm not sure the age. I bought it second hand of ebay for £5. Was a steal.
So what happens... When the wash cycle starts it drains and then opens the water inlet. So it takes water in. The beeping starts during this water in phase after a minute or so. Once the water valve closes so do the beeps. Too much water is let in, the the wash cycle starts. You can here the spinners moving through the water. I'm not sure what the pressure sensor mentored in the link is but they're is a turbity sensor which may have something to do with this.
Seems to me the wash pump works - spinners are going round.
Water inlet valve works.
It's just letting too much water in.

 

[Wayners]

The pressure switch is responsible for measuring the water level inside your dishwasher to prevent overfilling

 

[wildtypitch]

I've pulled the side of the machine and located the air break and turbine. There's a small flow wheel and red sensor that measures the rotations of the wheel letting the machine know how much water has been pumped in. The red sensor is worn out. If I push it closer to the motor the beeping stops. Tried wedging it but not reliable. See pic. I can purchase a new air brake and turbine unit for around £20. But I'll have a go at replacing this reed sensor with an off the shelf one. Fingers crossed.

 

[wildtypitch]

Only reed I could get in my local was a bit big. Thought I'd give it a go but the magnets in the flow wheel aren't powerful enough. I can find smaller more sensitive reed switches online. But at this stage I might just replace the unit.

 

[wildtypitch]

I caved in and purchased this replacement unit for £18. https://www.ebay.co.uk/itm/27655845...kjUqvZYQkm&var=&widget_ver=artemis&media=COPY
I could have tried another more sensitive reed switch but might have not worked. And the magnets in the rotor might have lost their strength. Would have been nice to fix for under a pound, but not worth ruining Christmas for £17.