Zannusi FJS1225 Burning smell

[MickGeorge]

Spent 2hrs trying to suss burning smell on machine – only happens 11, 6 min before end of program. As smell comes and goes difficult to locate but apears to be from rear left hand side and smells like something tracking or burning out. Checked usuall things like leaks terminal blocks componants overheating. Tryed diagnositic mode and left heater on but seems ok. No smell from module. Mega motor, heater etc all ok – thought at one time might be inlet valve but not visible sign of overheating

Anyone else come across this problem or any ideas?

Also can I mega whole machine without damage to module etc? Have refrained so far on electronic machines so far due to fear of same.

Thanks

[Dave_Conway]

Re: Zannusi FJS1225 Burning smell

A slow leak from the tub seal on to the motor springs to mind as a problem I’m come across with these on occasion ?

Dave.

[Simon46]

Re: Zannusi FJS1225 Burning smell

If this is the one with jetsystem is the pump running?

S.

[Martin]

Re: Zannusi FJS1225 Burning smell

Simon46 wrote:If this is the one with jetsystem is the pump running?

I think Simon may be correct here….Wash Pump cooking 😉

[MickGeorge]

I thought circ pump may have been prob but only feels warm not hot + only happens towards end of prog – thought it would happen b4 if it was circ pump.

Seems strange it only happens on last rinse and also smell comes and goes. Thinking about it today and wondered if it might be high speed windings although tested ok with mega but suppose they could be shorting?

No leaks apparent on machine either.

Thanks for suggestions – just thought someone might have experenced this as well.

[bobokines]

Re: Zannusi FJS1225 Burning smell

MickGeorge wrote: can I mega whole machine without damage to module etc? Have refrained so far on electronic machines so far due to fear of same.

Thanks

It’s a fallacy about not meggering electronic machines! Let’s face it, they account for 95{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} of current production machines!

Any machine should be able to cope with a 500v megger between live/neutral and earth… And every machine should be tested before and after any repair.

As long as you don’t touch static sensitive component with your bare hands when the boards are not connected to the machine, you will not damage any component using normal test equipment.

Bob

[Flyman]

Re: Zannusi FJS1225 Burning smell

As Bob says there is no problem meggering an electronic machine so long as you megger between earth and live/neutral. ie short out the live and neutral at the plug and put one lead of your megger to that, the other lead to the earth pin.

If you are only getting the smell on the last rinse then it would be worth disconnecting the second solenoid on the water valve and letting it fill on the first to see if you still get the smell. Its the only thing I can think of that is different on the last rinse compared to the others. 😕

[Phidom]

Re: Zannusi FJS1225 Burning smell

I don’t think Zanussi use double solenoid valves, they direct the water mechanically.

[admin]

Re: Zannusi FJS1225 Burning smell

Meggaring from the plug only tests an appliance up to the (double pole)On/Off switch which should be in the off position.

Individual components should be tested seperately, disconnected from circuit.

Kevin

[bobokines]

Re: Zannusi FJS1225 Burning smell

kheath wrote:Meggaring from the plug only tests an appliance up to the (double pole)On/Off switch which should be in the off position.

Kevin

Sorry Kevin, I’m not sure I agree with that. In my opinion a machine should be meggared after the machine is back in it’s position with the top on withthe power switch on and the timer knob rotated to include as many components as possible.

Some component’s that are double pole switched (eg the heater) may not show up as a fault when tested this way, but it is not unsafe on any component to test from the plug top.

The 500v test is only slightly higher than the peak voltage on the mains and that is why we use 500v. If we were talking about 2000v flash tests then I agree entirely.

Bob

[MickGeorge]

Looks like you guys have been Megaring electronic machines without any problem ortherwise you would have said so as far as I can see megaing the whole machine does’nt effect the control module. Thanks for your words of wisdom on the subject.

Ref water valve on this machine.. it’s a cold fill only and uses a dual valve, one for prewash other for main wash both for conditioner rinse.. tried disconecting prewash valve as that’s the one they use for cond rinse but dificult to say if that’s where the smell is coming from as it comes and goes and the valve only gets warm not hot..

Going back to check out motor again if all checks out ok will leave prewash valve disconnect and see if that stops smell.

Thanks

[Phidom]

Re: Zannusi FJS1225 Burning smell

😳 Sorry, yes I just went to the same model machine this morning and it is indeed a double valve. I found some bits of loose insulation plastic from the motor windings, some inside the motor and some elsewhere. Customer says the machine gets so far into a programme then resets itself to the beginning. She has not had any errors displayed. 😕

[Martin]

Re: Zannusi FJS1225 Burning smell

My apologies to MickGeorge for fuffin’ up the thread on his problem Zanussi (I can smell burning by the way…. 🙄 )

….but on the point about carring out ‘Electrical Safety checks on appliances” and stuff! The general rule is indeed to short out both live and neutral terminals together the other on the earth terminal, close the door of the appliance and switch on before taking a reading. Switching the appliance on is very important to obtain any reading at all within the appliance… 😉

BUT, firstly you need to test that the earth pin on the plugtop does connect to the appliance. Therefore it is important to carry out a low voltage ‘multi-meter type’ earth resistance check between the plugtop and an available grounding point on the appliance. Unless that is done, your meggar test is a useless exercise 8)

If these procedures are not carried out on completion of every repair and it subsequently turns out that someone gets electricuted as a result, then look out!

[leavemetogetonwithit]

Re: Zannusi FJS1225 Burning smell

This use of megger discussion is of great interest to me. I was taught to do earth continuity test first followed by 500v for 5 seconds between earth and live+neutral together. At the time I was taught, it was reccommended to disconnect any electronic components from the circuit. At that time that meant the module, usually two tags and a multi-plug. Obviously this is totally impractical in today’s world- you’d have to disconnect half of most machines!
The reason you join L+N (AFAIK) is to avoid a damaging current flowing between them. Now it seems to me that if there’s a short to earth via motor or heater for example then, when you do your check,current could flow at 500v through part of the circuit, possibly damaging sensitive electronics. You would assume that the damage had been caused not by your testing but by the fault condition before you got there. So you would come across damaged modules more often than people who are less strict about following the rules.
Since most houses have an rcd fitted these days which trips at 30 mA after a few milliseconds,it seems to me that a machine is more likely to be damaged by megger testing than by tripping the rcd.(IMO).
Comments/wisdom invited. 🙂
Mike.

[admin]

Re: Zannusi FJS1225 Burning smell

Sorry, I can’t agree with your testing proceedures at all.

Switching the appliance on does not test the various components throughout the appliance. Advancing the timer through all its positions is not possible on an electronic appliance.

For instance, motor circuits on many autos are not energised until the pressure switch is at level 2, the heater nuetral also relies on this, so many components are live waiting for a switched nuetral that you can not test in the methods you describe.

However individual comonent testing takes but minutes and if you are fault finding is the only way to do it.

Please explain to me how you apply your test to a double oven, hard wired into a switched outlet.

Kevin

[Author]

Posts