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Thanks for coming back to me so quickly 'Agile'. I've only just found this site. Is this switch simple to fit?

9 yr old Puma 80e started playing up. Switch on and CH & HW come on straight away regardless of timeclock. If hot tap not run the boiler boils over and spurts water out of overflow at top. Reset button not working. Any ideas ? Circuit board? Sensor? Help greatly appreciated.