Watch turns self off after disconnect from HRM belt. After a few hours comes back on again by itself and have to reset up time date etc.

I have the same watch 20 years old. I cannot wind this watch.
it is self winding , which is generated by arm or wrist movement.
i purchased a box for times I won't be wearing. Will rotate watch 5 minutes every hour ( belt driven- only use that other winders say gear my experience is belt drive more reliable)
if you have to wind this watch I would question if it is real Rolex.

I would think it is the sensor circuit in the watch. When you replaced the battery did you activate the processor all reset for the watch? I do not know on your model where or how this would be activated.

Electronic watches normally have a reset procedure for when the battery is changed. Very important the watch's processor reset is performed after changing the battery. This is not any of the user readings reset. This is a reset for the watch's processor and system. It is sometimes a contact that has to be shorted out with the jeweler's screwdriver, or it is a contact that has to be shunted, or etc., depending on the model. Maybe if you call the support for the watch they will tell you this. Normally they do not like the user opening the watch.

Your watch is 12 hours out of step. (The date changes every second revolution of the hour hand.)

Wind your watch forward 12 hours, (you may have to reset the date) and it will then change around midnight.

After reset, while you set the timer on and off, is there beep sound? If no, there is transmission problem whether in remote or in PCB.

First you have to assume the battery that comes with your HRM would be new - keep in mind that it may be stored in the warehouse for many moons.
Given that, open and take out the battery - that should make a hard reset on the HRM itself. Restore the battery and try the manual pairing again.
The heart icon should pop up again.

Otherwise, you have to suspect the battery is low and need to be replaced.

Good luck

I just dug my watch out after not wearing for a few years and had the same problem. There is an easy way to adust this watch's time and alarm, basically one way to enter both.

1) With the watch in the regular time display mode (doesn't matter if 12 hour or military time), depress and hold the lower left hand button (mode button). After a few seconds the watch appears to shift to alarm mode and it is blinking. This puts you into the mode for adjusting the alarm.

2) If you want to adjust time, date, etc rather than alarm time, after you have done step one, simply press that same lower left button again, and then it will put you into the time mode, but this time the time mode is blinking and you can adjust the various components (seconds, minutes, hours). You can only move minutes, hours, etc forward, no way to move backward. You will start off with the second display blinking, probably skip that unless you need to adjust seconds. Depress the upper right button to shift to the next option (minutes) and you will see the minute display blinking. Adjust the minutes by depressing the lower right button. When finished depress upper right button to move to next option (hours) depress the lower right button to move the minutes/hours/month/date forward as necessary, when you finish just press the lower left button again and it pulls you out of adjust mode and you are back in regular time viewing.

I had to post this because I've had this problem in the past and it killed me. Its kind of intuititve after you get into the adjusting mode by pressing the lower left button- remember, initially it will put you into adjust alarm mode, but press again and you will get into adjust time mode.

1. Press and hold the mode button until it starts to blink, then release.
   
2. First the alarm time will come up.
   
3. Press the mode button once to get to the time and date.
   
4. The seconds will flash first. 
   
5. Press the st/stop button to toggle between the seconds, hour, minutes, date (month and day) and day of the week.
   
6. Press the lap/reset button to change the values.
   
7. When done, press the mode button again to return to normal.
   

Reset Instructions Bench. (BC0013BR)


Time and Location
If you hold in the light, start and the reset button for a few seconds a screen will appear with the 12h or 24 h clock setting and also the date and country.

Once you have that screen if you press the mode button it will move over the date and clock etc then you just press the reset button and start button to choose the date and time.

Once you have changed the date and time to the correct date press the light button, start button and reset button and it will save the settings.

Alarm
Hold in the light, start and the reset button for a few seconds a screen will appear
press the mode button it will move over the date and clock etc then you just press the reset button and start button to choose the date and time. Use the light button to set the screen.

These are settings for the Timex SPORTS 1440 Magnetism (5b841 -W163US)
These are for the 4 button SPORTS 1440 (not 6 button) - they will also work for the 1440 SPORTS "Informer" model wrist watch - you will NOT find these instructions on the Timex website - only the 6 button which will not work on these watches is on that site!

TIME AND DATE

1. Press and hold MODE until HOURS digits flash (you'll be in Alarm Mode) Press MODE again to enter TIME mode, SECONDS digits will flash.
2. Press ADJUST to set SECONDS to zero.
3. Press START/STOP to select MINUTES.
4. Press ADJUST to change.
5. Repeat to set HOURS, MONTH, DAYS, and DAY of WEEK. Go through 12 hours to set AM or PM.
6. Press MODE when done.
7. To display DATE from Time display , press START/STOP.
8. With DATE displayed press and hold START/STOP, then press ADJUST to change display between DATE-MONTH and MONTH-DATE.
9. With TIME displayed, press and hold ADJUST, then press MODE to switch between 12-and 24-hour format.

ALARM AND HOURLY CHIME

1. Press and hold MODE until HOURS digits, DAY, and A or P (for AM or PM) flash.
2. Press ADJUST to change HOURS digits. Go through 12 hours for AM or PM.
3. Press START/STOP to select MINUTES.
4. Press ADJUST to change.. Press MODE when done.
5. Press and hold ADJUST, then press START/STOP to turn chime on/off. Press START/STOP again to turn alarm on /off. Release START/STOP when done.

CHRONOGRAPH

1. Chronograph will count up to 24 hours. Lap times are not stored. After 40 minutes chrono display changes from seconds to minutes.
2. With time displayed, press MODE to select Chrono Mode.
3. Press START/STOP to start.
4. Press ADJUST to view lap time. Press again to sesume lap timing.
5. Press START/STOP to stop timing . Press ADJUST to reset chrono to zero.
6. Repeat for successive laps.

Have fun! - Not a bad watch for the money! - - Silver Bullet

Nike Triax CV10 - Successful HRM reset 7 November 2008
 
I had real problems too. Even after repeatedly following the known reset steps everyone else is posting up. Here’s how I got mine going, please forgive the mind bogglingly tedious detail…
 
First make sure you’re using new good quality batteries. I used Maxell’s, bought in 10’s from Hong Kong on ebay – no problem.
 
Second, and this is the ESSENTIAL bit…move right away from the computer and any other electromagnetic sources before carrying out the known reset…
 
Third, follow the known reset steps below, adjusted to what worked for me…
 
If you press all four buttons of your Nike HRM it will reset. Next time you go to "RUN" mode, it will show "HRM LINK" error. You will now need to "hard reset" the unit.
 
Nike made a late change to add a "hard reset" to the chest strap. To re-link (re-initialise) the watch you'll need to open the battery door on the chest strap, and use a paper clip (or the equivalent) to push the small gold button in the battery area. There should be a small sticker in the battery compartment that points to the reset button.
 
The re-initialisation steps for the Nike C10 and CV10 digital HRM's is:
 
(1) reset the watch
(2) open the battery door on the chest strap
(3) move the watch to RUN mode
(4) press the reset button in the chest strap battery area without removing the battery
 
Tip - I agree with the suggestion to use a pin or needle and definitely do it with the battery in the hrm.
Tip – Thumb holds battery to stop it from pinging out, other hand performs jiggle with pin until the link is made (it links straightaway if you jiggle it just right!)
 
(5) replace chest strap battery cover…and smile!