Hygena 8224 – No neutral supply to mains water solenoid

[admin]

I’ve scanned previous responses to the problem on ‘no fill’ on your forum and done all the recommened things. I can manually fill and get it to continue beyond the fill cycle, including emptying fully. The water level limit switch is ok mechanically & electrically and I get 240v to EARTH on the 2 terminals of the solenoid but 0V between them. From this I imply that the control circuit is switched in the neurtal leg and that either the ‘Controller / Timer’ is faulty or that there is another control device which is not operating and I cannot find. Any one got a circuit diagram? or can give me a clue what to do next?

[Penguin45]

Re: Hygena 8224 – No neutral supply to mains water solenoid

With the power off, remove the door outer panel and check for broken wires in the door hinge area. Failing that, check the valve itself – you should get a reading of 3-4kOhms.

Beyond that you will probably need Pro help – check repairs@ or Repairs for a UKW repairer in your area.

Regards.
Penguin45.

[admin]

Re: Hygena 8224 – No neutral supply to mains water solenoid

Thanks
I checked the valve yesterday and it was 3.6kOhm, so I’ll look for the broken wire – or could it be a bad connection at the Timer end – on the connector block or on the PCB?
Regards
Peter

[Repeter]

Re: Hygena 8224 – No neutral supply to mains water solenoid

Thanks Penguin 45.
Found a broken neutral wire behind door hinge as you guessed. Also found circuit diagram in pocket behind door!! I fitted a new element (which I bought on the assumption your diagnosis was correct!). Machine started and filled. Well done. HOWEVER – it doesn’t fill above the raised section of the element. I suspect I still have the problem that led to a blackened element. How do I adjust the fill to the correct level?
Repeter / Repeter 2

[Dave_Conway]

Re: Hygena 8224 – No neutral supply to mains water solenoid

The water level appears correct to me, the water circulating inside is sufficient.

The blackened heater could be down to blocked spray arms, intermittent circualtion motor problems etc.

Dave.

[Repeter]

Re: Hygena 8224 – No neutral supply to mains water solenoid

Hi All.
Back to the Hygena.
I took the side panel off to check that it was filling and lifting the level sensor. It did and I started it off from the longest wash cycle. From time to time I stopped it and checked that the heating element wasn’t over heating. It wasn’t – so you are correct the water level doesn’t have to cover the element – so long as it’s circulating and taking the heat away.

Unfortunately it seems to stick in ‘hot water circulation mode’ about 3/4 through the second wash cycle and again in the same mode about 10 mins into the third was cycle (the economy one).
I helped it along manually and it picked up again.
Is this a timer problem eg a missing tooth to a cog, a bad contact or a dodgy semiconductor on the PCB?

Getting there with your help!! So far only TLC a replacement wire and a new element!
Repeter

[Dave_Conway]

Re: Hygena 8224 – No neutral supply to mains water solenoid

Repeter wrote:It wasn’t – so you are correct the water level doesn’t have to cover the element – so long as it’s circulating and taking the heat away.

I know, I’ve repaired enough of them 😀

Repeter wrote:Unfortunately it seems to stick in ‘hot water circulation mode’

How long for ? It’s meant to “stick”while it’s heating until the required temperature is reached then the thermostat “tells” the timer to move on.

There is no PCB in this model, only the mechanical timer and on the whole they are reliable.

Hope this helps.

Dave.

[Repeter]

Re: Hygena 8224 – No neutral supply to mains water solenoid

Dave
I suspect you’ve put your figure on it. I will check the thermostat. The old element was well cooked – black and swollen (but still working – for how long?). I was wondering why the stat had not protected it from over heating – unless of course it had gone faulty ie permanent closed circuit.
Ta repeter

[Penguin45]

Re: Hygena 8224 – No neutral supply to mains water solenoid

There are various stats, Repeter. You will have several “contol” stats for the various wash temperatures. There is one safety stat, which will shut off the heater should a severe overheat occur. The dishwasher uses static heat (ie the timer is stopped). The relevant control stat will complete the circuit for the temperature selected, and the time will run on.

Some discolouration of elements will occur over time – the problem will be exacerbated by choked/partially blocked rotors, so keep them clean.

Regards,
Penguin45.

[Repeter]

Re: Hygena 8224 – No neutral supply to mains water solenoid

Thanks Penguin45.
I suspect that this is a basic machine (Hygena / Brandt 8224). I suspect it only has one temp setting for two heated wash cycles. There appears to be a stat protuding into the wash cavity – to the right hand side – just below the element.
Any idea if spares are available.
Repeter

[NWAR]

Re: Hygena 8224 – No neutral supply to mains water solenoid

Spares are available from MFI on 0845 7959722 if no-one else can help out.

Craig

[Repeter]

Re: Hygena 8224 – No neutral supply to mains water solenoid

Hi all
Checked the stat function. It seemed to be ok. Machine was run with a full load.
IT BEHAVED ITSELF !!
Total work over 3 or 4 sessions.
A full clean of drainage system – filters pipe and spigot into domestic waste)
A full clean of the rotors and water circulation circuits.
A clean (as best I could) of the fill matrix behind the LHS panel
A replacement of the broken neutral lead to the water valve solenoid
A new element
The machine tipped fully forward to displace air locks in the fill/drain circuits
Thanks to Penguin45, Dave and all

[Author]

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