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Possible sources of interference signals include, BUT NOT LIMITED TO:
Wi-Fi Network Routers
Cordless Telephones
Cell Phones
Electronic Dog Fences
Garage Door Remotes
Noisy AC feeds
Florescent light ballasts
4. Using an ohmmeter, verify that upper and lower PCAs have a good electrical path to chassis
ground.
5. If the above procedures do not correct the problem, replace the heart rate board.