Question about Zanussi 24 in. ZSF6160 Free-standing Dishwasher

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Water not heating

My Zanussi ZSF6160 dishwasher (2 years old)stopped heating during both the wash and drying cycles. A repair man imediately suspected the control relay rather than the heating element. He subsequently dismantled the control module and found a black burn mark on the back of the control module PCB. This call out cost me £30 and he then quoted me a further £216 to fit a new control module!!!!! Once I had regained my composure I armed myself with soldering iron and multimeter, took the heating element control relay off and found it to be working perfectly, thus it was the PCB trace that had failed with carrying the 10A current thus with some extra beefy wires soldered to back of PCB to avoid any further PCB burn out I have cured my dishwashers ills and it now works perfectly again! The way the repair man knew exactly what the problem was I suspect that this is a common problem (design flaw) so I want to let others know that all that is required is a bit of resoldering rather than a hefty repair bill or a new dishwasher Is this weak PCB trace, carrying 10A, built in obsolescence?

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  • Tony Smith Sep 20, 2007

    One of the high current carrying solder joints on the relay had melted/been blown away and also the PCB trace near this joint had evaporated, so which bit whent first I can't tell. The trace varied in width and was perhaps a bit wider near the failed joint so perhaps it was actually a weak solder joint that failed blowing up some of the trace with it? The trace was on average 1/4 inch however some thinner sections had extra surface mount solder along its length to try to beef it up.

    The moral of this story is don't leave on high powered appliances (washing machine, dishwasher) when you are out of the house because there is a genuine chance they could fail and cause a house fire!

  • Anonymous Feb 19, 2008

    zanussi de6854 is not heating any ideas

  • AlanJC Feb 25, 2008

    I have the same 'no heating' problem Tony... and have emailed Zanussi telling them of the problem and asking them for the part number for the heater element so I can replace it. Their reply should be interesting... if they know the fault lies elsewhere! Do you have a diagram that shows what soldering is needed??

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  • Master
  • 883 Answers

Probably not, believe it or not. If they actually designed a trace to fail under load, then they could not predict when it may happen. Yes, things get more load-some over long use and demand more current, but the pcb trace was probably not intentionally too small. Let's say it was designed too small. So at first startup it carries 9.5 Amps. The next factory unit draws 9.8 amps. the next unit, wait a minute, draws 10 amps and blew the trace before it got shipped. I think this under-design was a simple oversight, but one that should have demanded a product recall from Zanussi that would send a tech to every unit to install a pcb with a beefier trace. Email Zanussi and complain! Just curious...can you measure how wide is this pcb trace? It should be about 1/4 inch wide.

Posted on Sep 20, 2007

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