I have a choronthern1vplus therm. that change filter indicator blinks all the time . I changed the filter and it still blinks. Owner manual does not tell you how to do this. I had a service man over and he had to call the office to find out how to do it. It is happening again after I changed the filter.

Read right side of page 8

http://customer.honeywell.com/techlit/pdf/69-0000s/69-1507.pdf