I am not getting any response from the Airflow Adroit on the Modbus bus. What should I check?

Verify that the baud rate is set to 19200 and parity is configured to even (8E1) on both the gateway and the MVHR unit. Also confirm that the A and B data lines are not swapped and that a 120 ohm termination resistor is placed at the end of the bus if the cable run is long.

Can I read and write the MVHR State register at the same time?

Yes. Registers 4609 (MVHR State) and 4612 (MVHR Boost Timer) are dual-purpose, meaning you read from and write to the same address. The template handles this automatically.

How do I know when the filter needs replacing?

The Filter Change register provides a status flag that indicates when the filter is due for replacement. You can configure a ModbusCloud alert on this register to receive a notification automatically.

Does the Airflow Adroit need a firmware update to support Modbus RTU?

Most Adroit units ship with Modbus RTU support enabled. If communication fails after verifying wiring and settings, consult the Airflow technical documentation or contact Airflow support to confirm your unit firmware version supports Modbus.

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Free Modbus template: Airflow Adroit MVHR | ModbusCloud

///Airflow Adroit MVHR

Modbus RTU

Airflow Adroit MVHR

Name: Airflow Adroit MVHR
Brand: Airflow
SKU: 23ef32aa-ab14-462c-abcb-d9659993d3c1

Airflow

Controls Airflow Adroit MVHR operating modes via Modbus RTU

Overview

Template for the Airflow Adroit MVHR ventilation unit over Modbus RTU. It reads temperatures, filter status, and operating state, and allows control of ventilation modes including boost, away, and at home.

Key readings

External Temperature
Limp Mode
Filter Change
MVHR State
MVHR Boost Timer

Available commands

MVHR State

MVHR Boost Timer

MVHR Fireplace Timer

Digital Input 1 Mode

Use cases

Monitor external temperature and MVHR operating state on a live cloud dashboard for each customer site.
Create an alert when the filter change indicator activates so you can schedule maintenance proactively.
Switch the Airflow Adroit between boost, away, and at home modes remotely without a site visit.
Set the boost timer remotely when a customer reports condensation or poor air quality.
Track limp mode events over time to identify recurring faults before they escalate.
Activate the fireplace timer remotely to manage ventilation during wood burner use in winter.

Installation

1Connect the Modbus RTU wiring (A, B, and GND) from the Airflow Adroit MVHR terminal block to the RS-485 port on your ModbusCloud gateway (MCG or MLP series).
2Set the Modbus slave address on the Airflow Adroit unit using its onboard controls or configuration menu, and note the address for gateway setup.
3Configure the serial port on the ModbusCloud gateway to 19200 baud, even parity (8E1), matching the Airflow Adroit default settings.
4Import the Airflow Adroit MVHR template from the ModbusCloud template library into your gateway project.
5Assign the correct Modbus slave address in the template to match the address configured on the physical unit.
6Verify communication by checking live register values on the ModbusCloud dashboard, confirming that external temperature and MVHR state are reporting correctly.

Things to watch for

I am not getting any response from the Airflow Adroit on the Modbus bus. What should I check?: Verify that the baud rate is set to 19200 and parity is configured to even (8E1) on both the gateway and the MVHR unit. Also confirm that the A and B data lines are not swapped and that a 120 ohm termination resistor is placed at the end of the bus if the cable run is long.
Can I read and write the MVHR State register at the same time?: Yes. Registers 4609 (MVHR State) and 4612 (MVHR Boost Timer) are dual-purpose, meaning you read from and write to the same address. The template handles this automatically.
How do I know when the filter needs replacing?: The Filter Change register provides a status flag that indicates when the filter is due for replacement. You can configure a ModbusCloud alert on this register to receive a notification automatically.
Does the Airflow Adroit need a firmware update to support Modbus RTU?: Most Adroit units ship with Modbus RTU support enabled. If communication fails after verifying wiring and settings, consult the Airflow technical documentation or contact Airflow support to confirm your unit firmware version supports Modbus.

Registers (8)

5 read / 5 write

Name	Address	Function	Type	Unit	Access
External Temperature Value is in CKelvin so need to _100 then -273	4356	FC03	uint16	K	R
Limp Mode	4621	FC03	uint16		R
Filter Change Days until filter change due	4620	FC03	uint16		R
MVHR State	4609	FC03	uint16		R/W
MVHR Boost Timer	4612	FC03	uint16		R/W
MVHR Fireplace Timer	4613	FC06	uint16		W
MVHR Extra Timer	4614	FC06	uint16		W
Digital Input 1 Mode	20518	FC06	uint16		W

Working with Modbus in your projects?

ModbusCloud is the hardware-plus-software platform that installers use to monitor, visualise and control Modbus devices from one portal. This template is one of hundreds you can use right away.

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Specifications

Protocol: Modbus RTU
Brand: Airflow
Registers: 8
Compatible models: Airflow Adroit MVHR
Last updated: 2 April 2026

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