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Posted to uk.d-i-y
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Bosch tumble dryer: delay after switching on
On 18/07/2019 05:36, wrote:
It's a condenser model, about 10 years old. The fault is that when the rotating switch is turned from the off position to any of the programs ("very dry", "cupboard dry" etc.), which normally causes an LED to light up and the machine to be ready for action (pressing the "start" button should set things in motion), there is a significant delay.
If the machine has been recently in operation, then there is no delay in lighting the LED when a program is selected. However, if the machine has been turned off for a few hours or more, then the delay is around 45-60 seconds. To be clear, it isn't an LED fault; the machine will not begin operating until the LED lights up and there is an audible click (a relay, I assume) when it does.
My first thoughts are a knackered built-in battery or a dead capacitor. Does that sound about right? If the machine still works (with a delay) in its current state, then I'm not sure what function the battery/capacitor is supposed to have. Maybe power for a memory function in the event of a mains disruption, to allow the machine to pick up where it left off?
Advice welcome.
Thanks.
Ant.
If it is any way similar to our 7yr old Bosch TD and it has a SMPSU*
then as the other post suggests could well be capacitor failure.
Another possibility is the startup resistor going high in value, if the
design uses one.
*The SMPSU failed on our Bosch TD (due to capacitor failure) but becuase
it was still under an extended warranty they changed the entire panel,
with the LCD display and everything.
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