Possible Solutions to Precor Error Code 31 Problem

Mar 03, 2020

Precor Errors 30, 31, 32 and 33  indicate the loss of communications or erratic communications between the microprocessors in the upper PCA and the lower PCA. The troubleshooting procedures for all of them are essentially the same.  Error 31 is defined as faulty data received from lower PCA (extremely rare). The main reason for a general communication error is a faulty interconnect cable, either it is not connected securely, or it has become damaged. 

Troubleshooting steps – TRM, EFX, RBK, UBK, CLM 
1. Substitute a known good interconnect cable between the upper and lower PCAs to determine if the interconnect cable is defective. 
2. Verify the interconnect cable is securely connected into the proper connectors on both PCA’s. The cable should lock, if the locking tab on the connector is broken replace the cable. 
3. Unplug all the components from the upper and lower PCA's except the data cable and the AC power going to the lower PCA. If the unit does not show an error, plug in components one at a time, cycling power on after each new component is plugged in. If a communication error is newly displayed, the last component plugged in is the cause of the error. 
4. Substitute a known good lower PCA to determine if the lower PCA is defective.