Heatpump Modbus Register 162: Total heating power consumed for master unit

Technical Definition

The register Total heating power consumed for master unit at address 162 is used to monitor total heating power consumed for master unit on the heatpump.

• Protocol: Modbus RTU
• Data Type: U DWORD
• Unit: kWh
• Access: Read Only

How to Read (Python pymodbus)

Use this code snippet to read this specific value via RS485:

from pymodbus.client.sync import ModbusSerialClient

client = ModbusSerialClient(method='rtu', port='/dev/ttyUSB0', baudrate=9600)
client.connect()

# Read Total heating power consumed for master unit (Address: 162)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=162, count=2, unit=1)

if not result.isError():
    print(f"Raw Value: {result.registers}")
else:
    print("Error reading register")

client.close()

Integration (Home Assistant)

Paste this into your configuration.yaml:

- platform: modbus_controller
  name: "Total heating power consumed for master unit"
  address: 162
  value_type: U_DWORD
  unit_of_measurement: "kWh"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[heatpump]

    PLC -- "A+ (D+)" --> Device
    PLC -- "B- (D-)" --> Device
    PLC -- GND --> Device

💡 Engineer's Insight

Analysis: Total cumulative heating power consumed in kWh for the master unit since reset.

Troubleshooting: Zero if the master unit is not consuming power for heating. Verify operation and sensor readings.