Zanussi Aquacycle 1200 not heating

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  • June 2, 2018 at 10:12 pm #94006
    2down
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    Zanussi Aquacycle 1200 FS1255W is going through a the complete wash, rinse, spin, drain cycle as normal but it does not heat the water at all.
    I have changed the heating element ( unnecessarily ) with the new cut out and it has made no difference, there is no voltage on the element.
    Any help with the next step to test appreciated,
    Dave

    June 5, 2018 at 1:19 pm #456165
    1totalshambles
    Participant

    Re: Zanussi Aquacycle 1200 not heating

    The cut out you refer to is an electronic temperature sensor = thermostat.
    So you have changed the complete element and you still have no heat. Other than a broken wire – not common – it could be the pressure switch – round thing with a thin hose that disappears to the semi transparent white chamber that is attached to the sump hose. Worth blowing down that pipe with the machine empty as might be blocked, you might as you pull that pipe off the pressure swt here a click and if you do the air trap will be the problem ( part blocked up ( this normally would cause the machine to over fill or at worst flood ) so long as machine is empty. Could be the actual swt itself but cannot remember how many clicks, 1, 2, or 3 it might have or its wires -wires not common fault. Other than that relay soldering joint on pcboard.

    June 6, 2018 at 9:56 pm #456166
    2down
    Participant

    Re: Zanussi Aquacycle 1200 not heating

    Thank you for the reply. I had to put the machine back together ( still not heating ) but I will have another go at it soon.
    I was beginning to think as the water levels were OK that the pressure switch was unlikely to be the problem. Is the heater switch independent inside the pressure switch?
    My other thought was the controller might think the water is always at the correct temperature. As the temperature sensor ( thermostat ) is new I traced the wiring back to the control PCB with my multimeter and there were no problems. I opened up the control unit and 1) there was a lot of carbon around the power section, bottom left 2) tracing the temperature sensor input, resistor R101 appeared to be missing/never fitted maybe designed this way but it did appear to be in series with the sensor.
    Anyway back together now, fully working except not heating water. I’ll try blowing down the tube soon.
    Thanks again, Dave

    June 10, 2018 at 3:13 pm #456167
    1totalshambles
    Participant

    Re: Zanussi Aquacycle 1200 not heating

    Well at a guess your down to pressure switch, pressure switch hose/air trap which it probably isn`t, and the pcboard. The carbon looking dust is usually seen within the pcb.

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