From the instructions, online:
Every time the chime selector switch is moved, the corresponding chime will start to ring.
Select the chime you wish to hear. The left position is Westminster and the right is Whittington. The chime will sync correctly and play the Westminster quarter hour chimes after the clock has been running 90 minutes.If your chime doesn’t count the correct hour:
1) Take out the battery
2) Set the time to 5:50 AM
3) Replace the battery in the cavity.
4) Set the time with the hands moving clockwise to the correct time.
5) The chime will sync correctly and play the quarter hour chimes after the clock has been running 90 minutes.
See
https://www.grandfatherclocks123.com/clock-news/seiko-westminster-whittington-chime-movement-instructions
Rnrhrj, March 2025