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2020-01-21 at 1:19 PM #13701
Are you using the same program you posted earlier? Can you post the output with debugging enabled?
Are you getting seeing responses in the raw debugging that mostly complete but are being rejected due to incorrect CRC or is the whole response only one or two bytes. Please post your output.
Are you sure you have the correct modbus address? Have you tried the running the GetSlaveId program: https://github.com/EnviroDIY/YosemitechModbus/blob/master/utilities/GetSlaveID/GetSlaveID.ino?