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  3. smart connect Modbus Vaillant (geoTHERM/3 heat pump)

ISE smart connect Modbus Vaillant (geoTHERM/3 heat pump) Modbus register map

Vaillant geoTHERM/3 heat pump through the ise Modbus TCP gateway

  • Official
  • 58 registers
  • Modbus TCP
  • Revision 1 · 2026-11-11

Official: Written from the manufacturer's documentation, but not tested on a device yet. Check the map against the manufacturer's documentation before you write to a live device. Tested it? Report a test.

Download .mbmap.json Raw JSON View on GitHub Suggest a correction Report a problem

Communication

Protocol
Modbus TCP
Unit ID
1
TCP port
502
Byte / word order
CDAB · bytes big-endian, words low first (word swap)
Addresses
1-based · wire address = address − 1

Connection values are defaults: the device may be configured differently.

Map

Registers
11 holding registers, 47 input registers
Groups
2
Translation tables
8
Revision
1 · 2026-11-11
Added
()
File
maps/ise/smart-connect-vaillant-geotherm3.mbmap.json · 16 KB · history
SHA-256
d7b01dad77ebafa92b86097298930f69df5103f3442f827181819fdb8bab424a
Manufacturer
ise.de

Sources and notes

  • ise smart connect Modbus Vaillant, Product Manual · version S-0002-007
    Section 4.5 Modbus registers and 4.6 data types

Source: ISE Individuelle Software und Elektronik, ise smart connect Modbus Vaillant, Product Manual (order no. S-0002-007), section 4.5

  • The gateway (ise smart connect Modbus Vaillant with the ise eBUS adapter) answers Modbus TCP and reads the Vaillant device over eBUS; this map is for unit ID 1, the geoTHERM/3 heat pump (the manual's Modbus unit ID). The manual covers the Vaillant geoTHERM/3 VWS 220/3 to 460/3 ground-source heat pump only; other Vaillant heat pumps such as the aroTHERM are not covered.
  • Modbus TCP, port 502 by default (configurable from 2000 to 4000). Functions 0x03, 0x04, 0x06 and 0x10. Addresses are one-based: register 1 is address 1 with address_base 1.
  • 32-bit values (uint32 and IEEE 754 floats) take two registers and the first register holds the least significant word (little word order); they can only be written together with function 0x10.
  • The gateway polls the heat pump over eBUS every 2 to 60 minutes depending on the value (2 minutes for most sensors, 15 for error history and outside temperature, 60 for counters), so reads show the last polled value. A request to a unit ID whose device is not present gets exception 0x0B.
AreaAddressNameTypeAccessUnitScaleDescription
IR 1 uint16 R
IR 2 uint16 R
IR 3 uint16 R
IR 4 float32 CDAB R °C
IR 6 uint16 R
IR 7 float32 CDAB R °C
IR 9 uint16 R
IR 10 float32 CDAB R bar
IR 12 uint16 R
IR 13 uint32 CDAB R
IR 15 uint32 CDAB R h
IR 17 uint16 R
IR 18 uint16 R
IR 19 float32 CDAB R bar
IR 21 uint16 R
IR 22 float32 CDAB R bar
IR 24 uint16 R
IR 25 int16 R °C
IR 26 uint16 R
IR 27 int16 R °C
IR 28 uint16 R
IR 29 int16 R °C
IR 30 uint16 R
IR 31 uint16 R
IR 32 uint16 R
IR 33 uint16 R
IR 34 uint16 R
IR 35 uint16 R
IR 36 uint16 R
IR 37 uint16 R
IR 38 uint16 R
IR 39 uint16 R
IR 40 uint16 R
IR 41 uint32 CDAB R kWh
IR 43 uint16 R
IR 44 int16 R °C
IR 45 uint16 R
IR 46 int16 R °C
IR 47 uint16 R
IR 48 int16 R °C
IR 49 uint16 R
IR 50 float32 CDAB R bar
IR 52 int16 R °min
IR 53 uint16 R
IR 54 int16 R °C
IR 55 uint16 R
IR 56 uint16 R
HR 57 uint16 RW %
HR 58 uint16 RW K
HR 59 int16 RW °min
HR 60 uint16 RW %
HR 61 uint16 RW
HR 62 uint16 RW °C
HR 63 uint16 RW °C
HR 64 float32 CDAB RW
HR 66 uint16 RW °C
HR 67 uint16 RW °C
HR 68 uint16 RW °C

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