It sounds like you're referring to a Climaveneta W3000 chiller/heat pump controller and a Modbus communication protocol that has been "patched" — possibly meaning:
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Commonly used for Chiller temperature setpoint (Software CA13+). Assignable from 001 to 200 (Default is often 11). Best Practices for a "Patched" Installation climaveneta w3000 modbus patched
Read-only limitations on registers that should be writable (like Setpoints). Timeout issues during high-frequency polling. Typical Modbus Register Settings It sounds like you're referring to a Climaveneta
| Component | Model / Version | Details | |-----------|----------------|---------| | Chiller Controller | W3000 (CVC/D series) | Firmware pre-patch: v3.18, v3.21 | | Modbus Interface | Internal COM port & Ethernet option card | RTU (RS485) or TCP (Port 502) | | External BMS | Any Modbus master | Tested: Siemens PXC, Schneider EM5900, Honeywell Spyder | Baud Rate : Ensure the baud rate is set correctly
Patched systems expose internal alarms (High discharge superheat, Oil pressure differential) as standard Modbus exception codes (0x10, 0x20), rather than cryptic LED blinks on the chiller’s local display.