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Runs very hot and distorts plastics - Dishwashers

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  • druin Nov 12, 2009

    Its the same plastics we have used for the last two years that are now damaged due to excessive heat. It has definetley got hotter as the worksurface above it is noticably hotter than normal. Can anyone tell me what controls the temperture of the heater element. I always use the 50c setting which takes 2 hours, there is also a 30c setting that takes around half an hour and this still gets excessively hot. Thanks.



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That usually happens if plastics are not specifically rated as dishwasher safe. Most dishwashers run at sixty to seventy degrees Celsius which is far hotter than any handwash and easily enough to soften any thermoformed plastics such as polythene, but there is usually a choice of cooler wash programs.

I can't give you any more specific advice as you have provided no information at all about the make and model of your dishwasher.

Posted on Nov 12, 2009

  • Obertelli
    Obertelli Nov 13, 2009

    In that case, you have a problem primarily with the thermostat.

    Many dishwashers use a number of thermistors which are fairly accurate and will use one for each programmable temperature setting. Others will use a simple thermocouple. Some thermistors from certain suppliers simply lose accuracy over time and thermocouples mostly work or cease functioning altogether. Models older than about twelve years old may still use a bimetallic switch (unreliable and inaccurate). Depending on the make and model of dishwasher it's also entirely possible that there has been a failure in the circuitry which monitors the thermal sensor readings. It's the combination of the monitoring circuit plus the sensor (thermistor/thermocouple) which combine to operate as a thermostat.

    You still haven't stated which make and model you have so I cannot be any more specific, but in any case you need to get a dishwasher repair specialist to diagnose and fix your problem. If the dishwasher is over five years old it's probably not cost effective to do so and some spares may be impossible to get.



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