Honeywell RTH2310 - Manual (Page 18)

Operating Manual
16
After 500 hours of heating or cooling time, an icon appears to indicate that
the filter needs replacement. Once the filter is replaced, press the
Filter but-
ton for 3 seconds to remove the icon and reset the counter.
Filter replacement
69-2229E_A.fm Page 16 Friday, February 19, 2010 10:12 AM