Zanussi ZNB 4051

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  • November 7, 2008 at 11:41 pm #40853
    R0B1N
    Participant

    I’ve read the fridge forum back to about 2005 and the related articles on fridge freezers. This is an excellent site and has been very informative, thanks. I now feel more knowledgeable and able to ask a sensible question or two :).

    Problem
    I’ve had this fridge freezer for about 18 months (warrant recently expired). The freezer is -18C and the fridge is warm.

    Defrost trial
    I’ve defrosted for 24hrs. There was very little frost to find. It failed to recool the fridge on restart, although the freezer cooled rapidly on restart and is working fine.

    Investigation
    The light is on and the PCB display appears to be working appropriately.

    I dismantled as far as I could confidently go without breaking anything and identified the fridge thermister and fan. The fridge thermister seems to be inseperable from the unit (connections burried behind casing somewhere). I could feel the fan, which rotated smoothly, but it is behind a curved casing at the top of the freezer section. There are 2 clips at the front edge of this but no other obvious fixings. I did not want to force for fear of breaking it. I assume that the freezer thermal controls are behind this too.

    I assume there is pressure in the system – the compressor seems to be working ok (although it seems to produce and episodic rather than constant sound) and there is no cause to suspect a puncture.

    I can’t hear the fan coming on but this may be because it is either very quiet or only comes on during a defrost cycle.

    Conclusions
    So I am down to:
    The fan may be broken
    A thermister/thermostat may be broken

    I’d like to test these, but am limited by access.

    Question
    So my questions are:
    1. Does anyone know specifically how to access these components in this particular model? (Zanussi ZNB 4051)
    2. Is there a simple way to test these without having to access them directly?

    Thanks in anticipation

    Robin

    November 8, 2008 at 6:24 pm #267787
    smartin
    Participant

    Re: Zanussi ZNB 4051

    they are an absolute nightmare to take apart, easily broken you can test everything from the pcb end but you will need a wiring to know what to test, also on these the door switch in the freezer operates the fan ie; so if freezer door is open it wont cool.

    November 20, 2008 at 2:36 pm #267788
    R0B1N
    Participant

    Re: Zanussi ZNB 4051

    How to access these components in the Zanussi ZNB 4051:

    1. remove all freezer drawers, shelves etc.

    2. remove back panel – there are two screws under obvious grey caps

    3. remove vent panel at the top/front (it has the door switch in it)

    This is the awkward bit.
    There are 4 clips:
    Two are obvious on the underside of the panel. These can be lifted carefully with a thin screwdriver and prised open. The clips will bend slightly but if careful won’t snap. they should stand out for a while before slowly returning to their original position.
    The other two are hidden at the sides. They can be accessed via small openings at the very edge of the panel. The clips themselves are oriented at 90 degrees to the opening so you will be coming at them from the side. You have to come at them directly from below with a flat shamfered blade so that upward pressure will open the clip outwards. A normal screwdriver won’t work because the angle of attack is wrong due to the screwdriver handle getting too close to the freezer casing. The only tool I can think of would be a screwdriver with a very thin handle, but a 1.4 inch blade.

    Once all 4 clips have been freed, the vent panel can be removed by pulling forwards. This will provide access to the door switch.

    4. Once the vent panel is removed, there are 2 hexagonal crews holding the curved top panel in place. Removing these provides access to the fan, thermisters and other components.

    The alternative to removing the vent panel first would be to drill a 1/2 inch hole in the square flat coverings of the hexagonal screws (located one at each end of the back edge of the vent panel). This will provide access to the hexagonal screws. Removing these will drop the curved top panel and vent panel together. All the vent panel clips can then be accessed directly.

    The final alternative is to go in blind and end up breaking off the square flat coverings described above. This is what happened to the engineer in my case. :rolls:


    For information it was the freezer door switch that was the problem. A new switch and vent panel are being ordered and we bodged the switch so the fridge will work in the mean time.

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