I have just had a professional electrician replace an old on/off extractor with an Airflow Quiet Air Humidistat extractor (has over-run and 2 speed motor) and an old fashioned single light with 8 spotlights - these have been wired into a 'wave' sensor light switch on the wall inside the bathroom, this switch replaced an old pull cord switch. The trouble I have is that what-ever setting the extractor is put on (has various adjustments) once the lights are turned off the extractor runs and runs and won't switch off like it's meant too. The 'wave' switch has four 'connectors' in the back of it, three have been taken up. The extractor also has an isolator switch outside the bathroom (this isn't new). I am already on my second extractor, having sent the first one back to the supplier thinking it was faulty due to this............. the electrician isn't calling me back despite having left LOTS of messages on his mobile and texting him for a response. Any ideas please...........