Taking it to pieces

[iadom]

I suspect oven baking would bork the board permanently.

[electrofix]

you could go down the route above and contact hotpoint as its on a recall

one of 2 things will likley happen

1 they will modify it which can include a new timer sometimes

2 they will just give you a new one as they seem to be doing with other faults they have

if they give you a new one it wont be as good as the one you have but it will be new

you have nothing to lose

also your no heat problem may be
1 lack of water if it does not fill enough it wont activate the heater safety switch
2 the thermal cutout / ntc which is on top of the heater box
3 the wiring harness as it can break at the bottom of the door

Dave

[thurgarton]

I did remove the PCB and checked the back of both boards. No sign of burning on either. Will advise how it turns out. thanks again.

[thurgarton]

We seem to have got out of synch with the messages. I will rebuild without trying to cook the PCB and check the other issues you raise. It certainly takes in water at the outset of the cycle, but I’m not sure how much. The wiring harness looks to be fine. How do I check the thermal cutout/ntc?

[electrofix]

one of the wires from the heater goes to the thermal cutout it then goes to the timer

you need to check the continuity of this by checking continuity from the time to the heater

the heater preessure sw is a micrositch on the heater box. this is activated by the water pressure when the pump starts. if there is not enough water flow due to blocked pump or low water pressure it stop the heater coming on for safety reasons

Dave

[thurgarton]

Thanks for that. I will check it out. Just in the process of rebuilding machine. Will keep you posted on progress.

John

[thurgarton]

Reassembly and trial run completed with the same result – no water heating. I left the sides off so that I could see what was going on. Filling appeared to be ok and the level was such that it just covered the inner floor. No sign of any heating after 20 mins! Overriding the program to empty also worked fine. I was puzzled to find that what appears to be a pump on RHS (viewed from front) next to the heater element did not appear to run and also got very hot! If it is a pump, itis not the one that empties the machine as that works! The thermal cutout would seem to be inaccessible. Any suggestions?

[electrofix]

when its full can you hear it washing. ie water being thrown around inside the tub

Dave

[iadom]

If the pump you are talking about sits virtually in the front, right hand corner then that is the main circulation pump. As Dave says if that isn’t working then no water will be pumping around the system and it will not heat.

[thurgarton]

Have attached picture of pump (next to heater element). Having looked at it, it would appear that in order to change it I would need to strip the machine right down, and even then I could not be sure that there wasn’t another problem. Replacement pump is £231 on eSpares so obviously not worth replacing so I think that I will have to admit defeat. Many thanks for all the help and advice – pity that we couldn’t achieve a better result. At least it gave me something to do during lockdown. Stay safe.

John

[electrofix]

well have you checked the pump is free to turn, would not be the first time I found a peice of glass jamming a pump

open door, take out filter. find a small mirror and with a torch you can see into the mouth of the pump and see the impellor

Dave

[iadom]

I have managed to change a couple of those without removing the tub, it was a major squeeze and getting the hose clips off and then back on was a real pain. 🙁

Officially it is a tub off job.

[thurgarton]

Pump will turn by hand from the rear. I have blocked the impellor and confirmed that it also blocks the pump so I guess that the pump itself is u/s. Checked the pump wiring and all three wires to the pump have continuity which seems odd, although it might explain why the pump body got so hot! Given the cost of a replacement pump I don’t think that the tub-off option is worth the effort and my arthritic hands preclude trying to remove the pump without removing the tub. Looks like washing up by hand until the end of the lockdown and then buying a new dishwasher (which is not much more expensive than replacing the pump). Many thanks for your helpful responses. stay safe.

John

[iadom]

TBH that ESpares price for the motor is well over the top, even so you would still be looking at around £150 to £175 for one. The real downside to spending a lot of money on an old but well constructed machine is the possibility of another part failing however small that is no longer available. 🙁

[electrofix]

iadom wrote:TBH that ESpares price for the motor is well over the top, even so you would still be looking at around £150 to £175 for one. The real downside to spending a lot of money on an old but well constructed machine is the possibility of another part failing however small that is no longer available. 🙁

@Iadom
do these units have a cap. i cant remember

Dave

[Author]

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