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defroster heater, calculating resistence of replacement

Discussion in 'Electronic Repair' started by komodore comrade, Jun 19, 2005.

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  1. hi there,

    my fridge is icing up and when i looked inside i found its 23" defrost
    glass tube heater shattered. it had a sticker stating 400w

    i found a 12" replacement of around 30ohms for a few bucks which i
    fitted. it iced up again and checking the heater i found it fused. part
    of the element coil broke from excessive current.

    what could be the problem? defrost thermostat? timer? resistence in
    replacement heater too high? how can i calculate it properly? does
    length of replacement heater make any difference to why it blew?

  2. NSM

    NSM Guest

    You need to use the right voltage heater to prevent that and the right
    wattage to prevent melting the fridge.

  3. James Sweet

    James Sweet Guest

    30 ohms is 480W assuming 120v. The resistance probably goes up a bit when it
    gets hot, so it's reasonable to assume that the new one is also 400W. I've
    never seen one of these shatter, though it stands to reason that the
    thermostat is probably defective and likely killed both the old one and the
    new one since they obviously got too hot.
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