hi, I've tried to reset by pressing and holding SELECT and the PLUS but it's just completely frozen. I can slide the slider to the different on/off positions but none of the buttons work to change the times or days. I am 9 days overdue with our first baby so need the heating to work quite desperately and don't want to pay massive call out fee I can't afford if there is a way I can cut power to the timer and put it back and it will reset itself. Please advise. many many thanks.