Corrective action
1. Use the remote on-off switch to set the cutting system to OFF.
2. Use the remote on-off switch to set the cutting system back to ON.
3. Make sure that all of the wire harness connections for the gas mixer module are correct and are fully
tightened.
4. If the diagnostic code continues:
a. Replace the gas mixer module.
Refer to VWI and OptiMix gas connect console mixer, resonators, transducers, and valves on
page 412.
b. If a new gas mixer module does not repair the problem, replace the gas connect console.
Troubleshooting for gas mixture communication errors
Diagnostic codes 724, 725, 742, 743
Diagnostic codes 724, 725, 742, and 743 occur when there is gas mixing communication error.
Symptoms
Code Symptoms XPR models XPR action Code cancels with...
724 There is a mixing communication error on I2C1.
725 There is a mixing communication error on I2C2.
All models Ramp down
742 There is a mixing alert for I2C1.
743 There is a mixing alert for I2C2.
All models None
• Set process
• Remote on-off
Corrective action
1. Examine the cable that is used to connect the gas connect console to ground:
a. Connect the cable if it is loose or not connected.
b. Repair or replace the cable if it has damage.
2. Make sure that there is no damage to the ribbon cables that connect the gas mixer control PCB to the
flow meters.
3. Make sure that all external panels for all system components are in position and installed correctly.
Diagnostics and Troubleshooting
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811530 Instruction Manual XPR460
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