NEFF Dishwasher won’t complete cycle – S51M53X0GB/28

[JamKart]

I’ve searched online but not really found anything that exactly matches this issue…

A fast cycle (29mins) seems to get stuck around 16mins. The light will go off and then back on again in approx a minute – but it doesn’t really advance any further. It even went back to 22 minutes. The water did drain away and it was hot inside but it had clearly got another 16mins of the cycle to do. I presume this was the final rinse and heat.

A eco cycle (220mins) seems to get stuck around 30 mins to go. So again, stuck at the final hurdle.

I’ve run a rinse cycle (15mins) to confirm the pump is working OK and that finished as expected on time and all the water has gone.

I’ve checked the impellor on the drain pump and no sign of blockage or fouling.

Various post suggest a heater issue caused by a faulty relay on the control module. I had a look at the heater relays and no visible sign of damage – but they are sealed so not much to see. Some posts indicate that the 10A relays were not high enough rating for the 10A heater – but my control module actually has 12A rated relays – so they have maybe redesigned the board based on feedback.

It points to control module issue but I’m reluctant to do this atm as they cost £167 (assuming I fit it myself) and I’m not confident it will actually fix it.

Does anyone have any other suggestions on what the problem is and anything I can test?

Cheers

[electrofix]

was wondering if the heater failed when hot

also check heater insulation resistance

Dave

[JamKart]

Thanks for the reply.

There is heat when I open the door after the cycle has stalled so is this expected if the heater has failed?

Or are you saying it might not be giving enough heat?

How do you check the heater installation resistant?

[electrofix]

Typo for resistant read resistance

all things have resistance even insulators

in some machines if there is a slight leakage to earth it can upset the electronics. not had it on a dishwasher but it is common on a lot of washing machines

Dave

[JamKart]

Ok, so how do I check that?

[JamKart]

This dishwasher has a heat pump rather than an element. Any idea how to check it? Given that I have heat then not sure its related to this pump.

[electrofix]

the heater connections are on the side of the motor

its the largest connector

the other connectors on the motor are

temperature sensors and motor connections ( at rear )

Dave

[JamKart]

I’m still not sure why you’re suggesting I check the heater when I’ve got heat? What resistance values are you expecting and what would indicate a fault?

Thanks for your help

[electrofix]

in exess of 5 million ohms to earth

Dave

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