Erratic or no heart rate signal using the Wearlink transmitter?

If you are having difficulty picking up your heart rate signal with the Wearlink transmitter it may be due to one or more of the following reasons.

The electrode belt must be very clean and the electrodes must be moistened before each use.

We would recommend washing the electrode belt regularly in the washing machine to avoid any corrosion building up inside the belt and snaps. It is also very important to disconnect both sides of the belt from the transmitter when not in use. Following regular maintenance will ensure a long lasting electrode belt.

If you are having a problem registering heart rate the first thing you should do is check the electrode belt for any corrosion in or around the snaps on the belt. If you have not been washing the transmitter regularly now would be a good time to start. Chances are you will see some type of corrosion that hopefully a good wash will eliminate. Make sure you do not use a machine dryer and never put the connector in the washing machine or dryer.

If this does not solve your issue, you may need to replace the battery in the transmitter. The Wearlink transmitter is the first Polar transmitter designed to have a user replaceable battery. The battery used in the Wearlink transmitter is a CR2025. Using a coin, open the battery cover by turning it counter clockwise to open. Insert the battery inside the cover with the + side against the cover. Make sure the sealing ring is in the groove to ensure water resistance. Press the cover back into the connector and turn the cover to close.

If you are still having the same problem, it may be time for a new electrode belt. Electrode belts are available online at