...HEART RATE READING BECOMES ERRATIC OR EXTREMELY HIGH (OVER 200 BPM)?
You may have come within range of strong electromagnetic signals which cause erratic readings on the receiver display. Check your surroundings and move further away from the source of disturbance.
Precautions.
...THERE ARE NO REACTIONS TO ANY BUTTONS?
Reset the Polar Heart Rate Monitor. All settings will return to the default settings.
1.Wear the Polar Transmitter as described earlier in this manual.
2.Simultaneously press both buttons and hold the Polar
logo of the wrist receiver to the Polar logo of the Polar Transmitter.
Display becomes full of digits. 2. Press either right or left button once.
Polar Heartwatch enters the Time of Day mode.
...THE DISPLAY IS BLANK OR FADING?
Have the batteries checked. 
Service.
...THE BATTERY OF THE WRIST RECEIVER MUST BE REPLACED?
We recommend having all service done by authorised Polar Service. Especially during the warranty period this is necessary to keep the warranty of the whole Polar Heart Rate Monitor valid. Polar Service will test your wrist receiver for water resistance after battery replacement and make a full periodic check of the complete Polar
Heart Rate Monitor. 
Care and Maintenance/ Batteries and Service.
Technical
Specifications
The Polar Heartwatch Heart Rate Monitor is designed to indicate the intensity level during physical activity. No other use is intended or implied. Heart rate is displayed as number of heart beats per minute (bpm).
POLAR TRANSMITTER
Battery type: | |
Battery life: | Average 2500 hours of use |
Operating temperature: | |
| 14 °F to 122 °F |
POLAR WRIST RECEIVER | |
Battery type: | CR 2032 |
Battery life: | Average 1 year |
| (2h/day, 7 days/week) |
Operating temperature: | |
| 14 °F to 122 °F |
Water resistancy: | to 20 metres |
Accuracy of heart rate |
|
measurement: | ±1% or ±1 beats per minute, |
| whichever larger, definition |
| appliescto steady state |
| conditions |
DEFAULT SETTINGS | |
Time of Day: | 10:00 AM |
26 | 27 |