Tip & How-To about Watches

Trouble with heart rate monitor reading heart rate.

Can't get a heart rate to show on your heart rate monitor? If there are no other issues with the watch, then most likely what you are experiencing is an issue with the Heart Rate Strap.

It is very common for all brands of heart rate monitors to have issues with measurement.

The #1 reason is poor contact with the strap and your skin. - Make sure the contacts are wet and touching the skin with good contact.
#2 reason - Weak battery, may need to replace.
#3 reason - Sensors on strap have salt build up from sweat - Clean the strap and contacts with soap and water, if deep cleaning is neccessary use a q-tip and some rubbing alcohol.
#4 reason - Strap is too low on the body, raise as high on the chest as possible to just under the breasts. Strap too low will cause a weak signal.

If none of these seem to help, then you should contact an authorized repair center or the customer service for your brand, and see about possible repair or exchange/ return.

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I just put a new battery in the Polar F4 heart rate monitor watch and it does not work. The battery died about 2 years ago and I never replaced it until now. How can I get the heart rate monitor working again? Is there a reset inside of it?


This is a common issue. The Polars and other Heart Rate monitors are not designed to be fixed by the consumers except for very specific models. These only look like watches, they are in fact mini computers and very susceptible to internal damage if not handled properly.

You need to send the unit it to a Polar Authorized Service Center to have fixed properly. There is not reset within the computer, if you had done everything correctly then it would work.

Dec 12, 2010 | Polar F4 Heart Rate Monitor Watch

1 Answer

how do you turn the heartrate monitor on?


How do I turn the Heart Rate function on and off on my watch? Within the Date and Time screen, if the heart icon is showing, the heart rate function is on. To turn off the heart rate function, simply hold the Reset button until the heart icon goes away.

Aug 14, 2010 | Sportline C9 by Champion Fitness 910 Watch

1 Answer

Timex M515 Heartb Rate Monitor in correct readings


I´m experienced the same problem of incorrect readings after a long time without use. I cleaned the rubber parts of the chest strap with soap and water, than I use some silicone grease or other silicon liquid to keep the rubber hydrated. Make a careful cleaning in the contact area between the rubber and the plastic parts, the fissure in these area use to be full of "sweat dust".

Jan 03, 2009 | Timex Digital 30 Lap Heart Rate Monitor...

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