in-line heater test?

[Mike_Javelin]

Re: in-line heater test?

Hi guys,

Still alive – 8)

Have traced the wires now and can’t find anything that looks dodgy.

All the tests seem to lead back to the heater unit again.

Power is getting to it so is it possible for a heater to fail and still give a good static reading?

The heater itself is supposed to have an internal cutout – how does these usually work, a bi-metalic strip of somekind?

there are no obvious signs externally.

[leavemetogetonwithit]

Re: in-line heater test?

Have you checked for dry joints on control board as Chris suggested?
If you look carefully you might see a burn mark or a cracked solder joint on the pcb.
POWER OFF OF COURSE.
Mike.

[Penguin45]

Re: in-line heater test?

Ok, 240v to the heater, resistance through the heater and no heat? Time to get the heater tube checked for earth leakage………

Penguin45.

[leavemetogetonwithit]

Re: in-line heater test?

Chris,I think he said 240 between L and E only so neutral may not be there.
Mike, you should follow the neutral back from the heater terminal using a battery powered meter or test lamp with POWER OFF.
Mike.

[gegsy]

Re: in-line heater test?

Mike I think I said that a few posts ago, we really not gettin anywhere 🙄 Earth leakage as Chris said and that should be it then 😆

Greg

[Mike_Javelin]

Re: in-line heater test?

Checked the pcb and all looks ok, nothing discoloured and those obvious conections all tested ok on the meter.

The neutral wire is dead easy it runs from the main power lead to that filter thing, to the pressure switch to the heater.
Continuity check makes my meter sing so thats seems fine.

Tell me more about this earth leakage – how can I test for it?

(now filling up the bath with washing up 😯 )

[leavemetogetonwithit]

Re: in-line heater test?

Earth leakage testing is normally done with a special meter costing hundreds of pounds.
There may be a DIY way round it. Have a look at the Haynes manual. I believe there is one for dishwashers specifically which you could buy for about £15 or ask at library.
Still might make more sense to find a competent service technician locally and ring him up.
BTW, are you certain the water’s not heating? What brought the fault to your attention?
Mike.

[qas]

Re: in-line heater test?

I don’t have details on this particular model, but recently I had a 44050 with similar symptoms, replacing the electronic unit solved the problem (there was nothing visually suspect on the electronic)

*If this model is too different, ignore this information
* PNC 911236213-01 for those that can use it

Steve

[Mike_Javelin]

Re: in-line heater test?

My previous look at the pcb was, I admit, less thorough that it could have been. 😳

This time I removed all the wires and removed the pcb from the plastic housing and sure enough there is a burnt out terminal

This is right under the NAIS JS1-12V AJS1311 10A 125V~ Relay 😀

Alltogether – “I told you so” ok, ok, must do better………..

Talked to service force, who support AEG and they will only supply the full board at £94 plus they say it will be 10 days before they get one in.:x

Rs list a very similar relay for £1.27 at
http://rswww.com/cgi-bin/bv/rswww/subRangeAction.do?catoid=-1600755194&logText=ya014&cacheID=uknetscape

Will this do it or is there a better way?

[Dave_Conway]

Re: in-line heater test?

We’ll need the PNC please Mike similar to the number Steve (gas) posted to identify the correct PCB.

Dave.

[Mike_Javelin]

Re: in-line heater test?

pnc 911 232 633

[Dave_Conway]

Re: in-line heater test?

Part number 973911232633009 at £71.79 ex VAT and carriage in that case as you’ve already discovered but I can get it a tad faster than that 😉

An email to spares@ukwhitegoods.co.uk please if you’d like one 🙂

Is the relay actually damaged though as it looks like just a dry joint to me ?

Dave.

[leavemetogetonwithit]

Re: in-line heater test?

If you take the board into a local appliance or TV repair shop I expect they’ll solder it and/or fit a new relay for you.
Mike.

[Mike_Javelin]

Re: in-line heater test?

Thx Dave

But £70 odd is a lot of money for a £2 relay,

Perhaps I need a definition of “dry joint”
there is some slight evidence of burning/smoke on the plastic and it looks like the solder has been melted away from the terminal.
Nothing major but definatley there.

[whitevanman]

Re: in-line heater test?

I have previously worked within the manufacture of PCB’s (SHARP mw ovens,video, typewriters, photocopiers etc), now in the white goods repair industry, sometimes during manufacture of pcbs things ie component/processes can come/get dirty, even though they are run down a production line which uses liquid flux to clean bottom of board and components, prior to wave solder machine joints can be still dirty and the solder does not fuse components perfectly with copper tracks on board, this causes resistance meaning when a current flows through over a period of time this results in heat which melts the solder resulting as picture you posted shown that is a definition of a dry joint hope this helps.

Wayne (WVM)

[Author]

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