I am having some trouble with the ceiling mounted Vent Axia Lo Carbon Silhouette extractor fan in my bathroom. This normally turns on/off with the light switch but has been running continuously for the past couple of days, both of the blue lights are continuously on also (pic attached). There is an override switch outside the bathroom which does turn the fan off but as soon as you put this switch back on the blue lights instantly reappear and it starts up again even without the bathroom light being on. Any ideas on how to get this running as normal again i.e. only coming on with the light switch? Should also mention that this has a built in humidistat so not sure if this is contributing to the issue?