The Mira Advance can be reset by turning the power on and off at the pull cord. This resets the PCB. However if the problem persists you have a fault. I'd advise ringing Mira Customer Support on 0844 571 5000 who have the Engineers who can repair at a fixed price.
Bob The Builder
April 2011
I can answer this question...
how do i reset my mira advance shower is their a reset inside it?
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Try fixfault.com to fix baths and showers.