Try re-pairing the belt pod with the wrist-watch computer. Below text comes from page 37 of the
T6c users manual.
If you replace the belt battery or are having troubles with the signal
reception, you need to re-pair your belt with your Suunto t6c.
To re-pair the belt:
1. Remove the belt battery
2. Push the (new) battery into the compartment positive side down.
3. In your Suunto t6c, enter the settings menu and enter GENERAL.
4. Scroll to PAIR with [Lap +] and [Light -] and enter with [Mode].
5. Scroll to HR BELT with [Lap +] and [Light -].
6. Activate pairing with [Mode].
7. Put the battery in with the positive side up and close the cover.
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