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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.
A few years back, my parents had an issue with a washing machine where
it would fail to power on every time when turned off (i.e. not left in
"end of program" standby)
Randomly turn the power off then on again a few times, and you could
persuade the thing to power up correctly until the next time it got
turned off again.
Extracting and opening the control module revealed a bulging
electrolytic capacitor. Replacing the capacitor fixed the issue.
Note that this was a "normal" capacitor, not a "supercap" used to hold
settings etc.
I would do a physical inspection of any control board looking for bulged
caps. (a google image search for "bulging capacitors" will show you what
you are looking for).
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