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Good afternoon all,
Wondering if anyone can advise on the above problem?
The m/c trips out after a few minutes, and I suspected the heater unit.
Thus, I disconnected the heater and the m/c didn’t trip.
Although a reasonable Ohms reading was obtained I renewed the unit.
However, the fault remains…
I’ve visually inspected the e.c.u. which appears fine.
Could this still be the cause, as I’m fairly new to the business and haven’t come across an e.c.u. causing this problem?
The wiring appears good, though may have to investigate for a short circuit.
Kind regards,
jonty
Re: Bosch SGS66A02GB/21 Dishwasher Tripping Out
jontymox wrote:The m/c trips out after a few minutes, and I suspected the heater unit.
I guess you didn’t Megger the heater as you refer to ohms rather than megohms?
jontymox wrote:I’ve visually inspected the e.c.u. which appears fine.
a.k.a Module I think?
jontymox wrote:Could this still be the cause, as I’m fairly new to the business and haven’t come across an e.c.u. causing this problem?
No you are correct, modules don’t trip electrics just the working components it controls. The main suspects being:-
Mains filter
Dispenser actuator
Circulating pump motor
Inlet valve coil
Wall socket/plug topHTH?:D
Re: Bosch SGS66A02GB/21 Dishwasher Tripping Out
Thanks for your input Martin,
No, I didn’t megger the heater as the only way I know to correctly do so is to place one lead on the element itself.
I suspected the heater unit was faulty as the m/c didn’t trip when heater connection disconnected.
Best wishes,
jonty
Re: Bosch SGS66A02GB/21 Dishwasher Tripping Out
jontymox wrote:No, I didn’t megger the heater as the only way I know to correctly do so is to place one lead on the element itself.
I’m not with you there TBH. :con:
jontymox wrote:I suspected the heater unit was faulty as the m/c didn’t trip when heater connection disconnected.
So you went to all that trouble and expense and there was nothing wrong with the heater….oh dear! 🙁
Re: Bosch SGS66A02GB/21 Dishwasher Tripping Out
Good morning,
To conclusively test for low insulation I attach the positive lead of my Megger to the positive terminal of the heater, and the negative lead to the element itself.
As the heater in question is a remote unit, I did not carry out an insulation test as above, as I didn’t wish to break the unit in removing it from it’s plastic housing.
I was pretty sure the heater was the cause of the fault, as no tripping occurred when disconnected from the circuit… one clearly was mistaken, and can learn from this mistake!
In the meantime, could you please cease highlighting sentences, and commenting on them in such a sarcastic and humiliating manner?
Thank you,
jonty
Re: Bosch SGS66A02GB/21 Dishwasher Tripping Out
Sorry about that Jonty but I was only trying to help you get to the bottom of the problem. And from what you have said it seemed apparent to me, rightly or wrongly, that you were unsure how to correctly carry out an insulation test on the heater. Especially as you refer to not wishing to take the heater out of it’s housing to get to the element when in fact all you need do is connect one lead to the element terminal and the other onto its earth bracket. Highlighting the relevant sentences helps toward replying to specifics, as in this case and I’m sorry you felt aggrieved by that.:(
Re: Bosch SGS66A02GB/21 Dishwasher Tripping Out
OK,
Shall remember that one can carry out an insulation test this way for future reference.
Quite why the m/c is tripping, I still don’t know, as it definetely relates to the heating circuit.
jonty
Re: Bosch SGS66A02GB/21 Dishwasher Tripping Out
What’s the insulation reading for the heater?
Have you checked the motor?
Re: Bosch SGS66A02GB/21 Dishwasher Tripping Out
More than likely the mains filter. Visually inspect for black soot marks.
Re: Bosch SGS66A02GB/21 Dishwasher Tripping Out
Thanks for your advice…
Will double check the mains filter, although unsure which connections to connect Megger to on wash pump/motor.
Original and new heater units give OL reading, and similar good Ohms readings of 28 to 30 Ohms.
Best wishes,
jonty
Re: Bosch SGS66A02GB/21 Dishwasher Tripping Out
Ir test it at the mains plug with everything connected (earth to live, earth to neutral). If its above 2 then plug back in and run until it trips the perform the same test again. At this point one would hope its below 2, then disconnect each component until you find what’s dragging it down.
If its below 2 before you start then again disconnect as above until you find it.
Re: Bosch SGS66A02GB/21 Dishwasher Tripping Out
In my experience I found it’s difficult to megger the dw with faulty mains filter, given the low cost of new main leads it’s worth getting some and keep in the van as it’s getting more common these days. Swap it over and resume the test with the megger. Save yourself the hassle on trying to disconnect each components as you will still get the same readings throughout and leaves you scratching your head. It’s hard to test the main leads itself without “shorting” your megger.
BTW – it’s not the ohms reading I was after, it’s the insulation readings off the megger. I would be worried if you test the dishwasher with the insulation readings of 2 and accept it as a pass when you have tested so many, you should expect it to be sky high. Yes the minimum insulation readings for class one appliance is 1 and 2 for class two appliance but do not accept this as a pass for the dishwasher as it should be a lot higher.
Re: Bosch SGS66A02GB/21 Dishwasher Tripping Out
Bosch d/w mains leads?….what are you on about?
Mains filters blow, fact, but that effects only L & N the moment power is switched on due to the failure of the capacitive coupling between the two poles. (a well known problem) but not the issue in this case. Jonty’s problem with meggering a motor is also a caution (and Jonty, not a criticism) as I suspect he may need further training in this area?
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