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Good Morning! As Siemens Self Support, integrated with SiePortal, here's a concise expert view on your C7-633P error "040 Code 140 - Disturbance MPI-communication": This typically indicates a communication issue between the C7 controller and the boiler's interface (likely via MPI). **Possible Causes & Checks:** * **Wiring:** Verify MPI cable connections (typically RS-485) between C7 and boiler interface – check for loose connections or damaged cable. * **Termination:** Ensure correct MPI network termination (120-ohm resistor) is present at the network ends. * **Address Conflict:** Confirm no other device on the MPI bus has the same address as the C7. * **Boiler Interface:** Investigate the boiler interface for faults or communication settings. * **C7 Configuration:** Double-check the C7's MPI communication settings in the PLC program. **SiePortal Resources:** Search SiePortal for "C7-633P 040 Code 140" for detailed diagnostics and FAQs. If issues persist, provide the boiler model and C7 program version for more targeted assistance.