Precor Error Code 84 Strain Gauge Response Too High

Feb 11, 2022

Applies to Chrono bike

Issue symptoms

Strain gauge response is, or has been, detected as too high. This error is only detected or cleared while NOT pedaling. The LPCA software has an Auto-Cal operation that zeros the torque when the rider stops pedaling. Auto-Cal operation should show some change when pedaling stops, as follows:

• Seconds after pedaling stops, and with NO pedaling, the torque should reset to 0; this is normal.
• If the rider stops pedaling with the resistance knob at a high resistance AND the torque reading has a large difference, this will cause power readings to be wrong for the rider.
• This issue can be resolved if the rider reduces the resistance and stops pedaling, which will zero the unit properly.

This can be a temporary condition due to some rider pedaling/resistance settings and residual torque difference modalities.

Troubleshooting steps:

1. Run the Torque Service test to measure the real-time torque response.
2. While pedaling, the response should vary based on the position of the resistance knob and, to a small amount, vary with the pedaling rate. If the torque remains the same, the strain gauge is broken or, the cable or cable connection is defective.
   1. Check all connections. If the issue persists, replace the caliper.
3. If the value varies but is largely at minimal resistance, the caliper gauge may have been deformed by mechanical stress.
   1. Check all connections. If the issue persists, replace the caliper.