zanussi ZDT21001FA Dishwasher Heater fault

[Latham63]

This dishwasher is fitted with a heater that incorporates an overheat cut out.
Once the cut out has activated the heater has to be replaced.
The cutout is a blob of solder which melts when hot! It`s a crap design.
I`ve fitted 2 of these new heaters to other dishwashers & they have failed again shortly afterwards.
Is there a thermostat which could be failing elsewhere,causing an overheat condition?
There`s a sump pressure sensor on this machine also.
Any ideas please?

[electrofix]

its probably down to flow. if pump is weak or the jets are blocked the water will stay too long in the heater. On some bosch machines I have heard the diverter valve failure can also cause the heater to blow

Dave

[adv]

Latham63 wrote:This dishwasher is fitted with a heater that incorporates an overheat cut out.
Once the cut out has activated the heater has to be replaced.
The cutout is a blob of solder which melts when hot! It`s a crap design.
I`ve fitted 2 of these new heaters to other dishwashers & they have failed again shortly afterwards.
Is there a thermostat which could be failing elsewhere,causing an overheat condition?
There`s a sump pressure sensor on this machine also.
Any ideas please?

dear god what next ? what about resoldering it ?

[electrofix]

adv wrote:

dear god what next ? what about resoldering it ?

NO
as you would need to know the melting point of the solder they have used

Dave

[Latham63]

Thanks Dave. Makes sense if the flow is slower. The circulation pumps are cheap & nasty too!

[Author]

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