CO2-based airflow control is not responding. What should I check?

Verify that register 8000 is set to 2 and the physical position switch on the unit is set to position 1. CO2 control does not operate when the switch is at position 0 or the fan symbol (absent mode).

What baud rate and parity settings does the Brink Flair require?

The Brink Flair uses 19200 baud with even parity (parity setting 1). Ensure these match exactly on your ModbusCloud gateway, as mismatched settings will prevent communication.

Can I read and write Q Min, Q Max, and PPM thresholds?

Yes. Registers 6001 (Q Min), 6003 (Q Max), 6151 (Min PPM), and 6152 (Max PPM) are all readable and writable. Changes take effect immediately on the unit.

Which Modbus interface module do I need on the Brink Flair?

You need the Brink UWA2-B or UWA2-E Modbus interface module installed on the ventilation unit. Refer to the corresponding Brink Modbus manual for wiring and addressing details.

Free Modbus template: Brink Flair

Name: Brink Flair
Brand: Brink
SKU: 207a0aed-fa6a-4446-9543-b0ae62abbf18

Template for Brink Flair 225-600 heat recovery ventilation units over Modbus RTU. Reads sensor data such as temperatures, humidity, CO2 levels, fan speeds, and pressures. Writes airflow presets, CO2 thresholds, bypass settings, and postheater setpoints for CO2-based airflow regulation.

Registers (150)

150 read / 67 write

Name	Address	Function	Type	Unit	Access
Software version number 0	4000	FC04	uint16		R
Appliance Type	4004	FC04	uint16		R
Dipswitch value	4005	FC04	uint16		R
Serial number 0	4010	FC04	uint16		R
Serial number 1	4011	FC04	uint16		R
Serial number 2	4012	FC04	uint16		R
HRA (Heat Recovery Appliance) Active Function	4020	FC04	uint16		R
Fan control type	4021	FC04	uint16		R
Ventilation mode	4022	FC04	uint16		R
Hardware version	4003	FC04	uint16		R
Software version number 2	4002	FC04	uint16		R
Temperature sensor exhaust fan	4046	FC04	int16	°C	R
Software version number 1	4001	FC04	uint16		R
Current supply pressure	4023	FC04	int16	Pa	R
Current exhaust pressure	4024	FC04	int16	Pa	R
Fan Inlet Status	4030	FC04	uint16		R
Setpoint supply air	4031	FC04	uint16	m³/h	R
Current value of supplyair	4032	FC04	uint16	m³/h	R
Speed supply fan	4034	FC04	uint16	rpm	R
Temperature sensorsupply fan	4036	FC04	int16	°C	R
Fan inlet sensor rel.humidity	4037	FC04	uint16	%	R
Fan exhaust Status	4040	FC04	uint16		R
Setpoint flow exhaust air	4041	FC04	uint16	m³/h	R
current value flowexhaust air	4042	FC04	uint16	m³/h	R
MassFlow exhaust,actual value	4043	FC04	uint16	kg/h	R
Speed exhaust fan	4044	FC04	uint16	rpm	R
Fan exhaust sensor rel.humidity	4047	FC04	uint16	%	R
Bypass status	4050	FC04	uint16		R
Status preheater	4060	FC04	uint16		R
Capacity of preheater	4061	FC04	uint16	%	R
Frost status	4070	FC04	uint16		R
Frost heaterpower	4071	FC04	uint16	%	R
Flow switch position	4080	FC04	uint16		R
NTC1 temperature	4081	FC04	int16	°C	R
NTC2 temperature	4082	FC04	int16	°C	R
RHT Sensor Humidity	4083	FC04	uint16	%	R
Signal output Status	4090	FC04	uint16		R
Status filter	4100	FC04	uint16		R
eBus power status	4101	FC04	uint16		R
Current time	4110	FC04	uint16		R
Current date	4111	FC04	uint32		R
Operating time	4113	FC04	uint32		R
Filters used in days	4115	FC04	uint16		R
Filters used in m3/h	4116	FC04	uint32	m³	R
Total flow in m3/h	4118	FC04	uint16	m³	R
Geo heat exchangerStatus	4150	FC04	uint16		R
CO2 sensor 1 status	4200	FC04	uint16		R
Value CO2 sensor 1	4201	FC04	uint16	ppm	R
CO2 sensor 2 status	4202	FC04	uint16		R
Value CO2 sensor 2	4203	FC04	uint16	ppm	R
CO2 sensor 3 status	4204	FC04	uint16		R
Value CO2 sensor 3	4205	FC04	uint16	ppm	R
CO2 sensor 4 status	4206	FC04	uint16		R
Value CO2 sensor 4	4207	FC04	uint16	ppm	R
Software version numberUIF Module(e.g. "S1.01.03.0001")	4400	FC04	uint16		R
Software version numberUIF Module(e.g. "S1.01.03.0001")	4401	FC04	uint16		R
Software version numberUIF Module(e.g. "S1.01.03.0001")	4402	FC04	uint16		R
Hardware versionnumber UIF Module (e.g."H1.1")	4403	FC04	uint16		R
Device Type	4404	FC04	uint16		R
Dipswitch value	4405	FC04	uint16		R
Language Data versionUIF Module (e.g."S1.01.03.0001")	4410	FC04	uint16		R
Language Data versionUIF Module (e.g."S1.01.03.0001")	4411	FC04	uint16		R
Language Data versionUIF Module (e.g."S1.01.03.0001")	4412	FC04	uint16		R
Software version nr UIFModule (e.g."S1.01.03.0001")	4413	FC04	uint16		R
Software version nr UIFModule (e.g."S1.01.03.0001")	4414	FC04	uint16		R
Software version nr UIFModule (e.g."S1.01.03.0001")	4415	FC04	uint16		R
Local UIF Switch	4420	FC04	uint16		R
Local Button value	4421	FC04	uint16		R
Software version nExtension ModuleUWA2-E (e.g."S1.01.03.0001")	4500	FC04	uint16		R
Software version nExtension ModuleUWA2-E (e.g."S1.01.03.0001")	4501	FC04	uint16		R
Software version nExtension ModuleUWA2-E (e.g."S1.01.03.0001")	4502	FC04	uint16		R
Hardware version nrExtension ModuleUWA2-E (e.g. "H1.1")	4503	FC04	uint16		R
Device Type	4504	FC04	uint16		R
Temperature NTC Extension	4520	FC04	int16	°C	R
Extension contact 1	4521	FC04	uint16		R
Extension contact 2	4522	FC04	uint16		R
Extension AnalogueInput 1	4523	FC04	uint16	V	R
Extension AnalogueInput 2	4524	FC04	uint16	V	R
Extension Relay output 1	4541	FC04	uint16		R
Dipswitch value	4505	FC04	uint16		R
Extension Relay output 2	4542	FC04	uint16		R
Extension Analogue Output 1	4543	FC04	uint16	V	R
Extension Analogue Output 2	4544	FC04	uint16	V	R
Flow preset 0	6000	FC03	uint16		R/W
Flow preset 1	6001	FC03	uint16		R/W
Flow preset 2	6002	FC03	uint16		R/W
Flow preset 3	6003	FC03	uint16		R/W
Switch default position	6031	FC03	uint16		R/W
Use display as switch	6032	FC03	uint16		R/W
Imbalans allowed	6033	FC03	uint16		R/W
Imbalance value	6034	FC03	uint16		R/W
Offset imbalance supply	6035	FC03	int16	%	R/W
Offset imbalance exhaust	6036	FC03	int16	%	R/W
Bypass mode	6100	FC03	uint16		R/W
Bypass temperature fromdwelling	6101	FC03	int16	°C	R/W
Bypass temperature from outside	6102	FC03	int16	°C	R/W
Bypass temperature hysteresis	6103	FC03	int16	°C	R/W
Bypass boost	6104	FC03	uint16		R/W
Bypass boost switch position	6105	FC03	uint16		R/W
Frost control minimum inlet temperature	6111	FC03	int16	°C	R/W
Days before filter warning	6120	FC03	uint16		R/W
External heater mode	6130	FC03	uint16		R/W
Postheater setpoint	6131	FC03	uint16	°C	R/W
RHT (humidity) sensor mode	6140	FC03	uint16		R/W
RHT (humidity) sensor sensitivity	6141	FC03	int16		R/W
CO2 sensor mode	6150	FC03	uint16		R/W
CO2 sensor 1 low level	6151	FC03	uint16	ppm	R/W
CO2 sensor 1 high level	6152	FC03	uint16	ppm	R/W
CO2 sensor 2 low level	6153	FC03	uint16	ppm	R/W
CO2 sensor 4 high level	6158	FC03	uint16	ppm	R/W
CO2 sensor 2 high level	6154	FC03	uint16	ppm	R/W
CO2 sensor 3 low level	6155	FC03	uint16	ppm	R/W
CO2 sensor 3 high level	6156	FC03	uint16	ppm	R/W
CO2 sensor 4 low level	6157	FC03	uint16	ppm	R/W
Signal output Setting	6170	FC03	uint16		R/W
Switch type Input 1	6200	FC03	uint16		R/W
Digital Input 1 function	6201	FC03	uint16		R/W
Digital input 1 supply fan function	6202	FC03	uint16		R/W
Digital Input 1 exhaust fan function	6203	FC03	uint16		R/W
Switch type Input 2	6210	FC03	uint16		R/W
Digital input 2 function	6211	FC03	uint16		R/W
Digital input 2 supply fan function	6212	FC03	uint16		R/W
Digital input 2 exhaust fan function	6213	FC03	uint16		R/W
Analogue input 2 Mode	6230	FC03	uint16		R/W
Analogue Input 1 Mode	6220	FC03	uint16		R/W
Analogue input 1 Vmin	6221	FC03	uint16	V	R/W
Analogue input 1 Vmax	6222	FC03	uint16	V	R/W
Analogue input 2 Vmin	6231	FC03	uint16	V	R/W
Analogue input 2 Vmax	6232	FC03	uint16	V	R/W
Geo-heat exchanger	6240	FC03	uint16		R/W
Minimum temperature geo-heat exchanger	6241	FC03	int16	°C	R/W
Maximum temperaturegeo-heat exchanger	6242	FC03	uint16	°C	R/W
Default geo heatexchanger Valve Position	6243	FC03	uint16		R/W
Geo heat exchangervalve output	6244	FC03	uint16		R/W
Language	6900	FC03	uint16		R/W
Date format	6901	FC03	uint16		R/W
Time notation	6902	FC03	uint16		R/W
Date Month Day	6903	FC03	uint16		R/W
Date Year	6904	FC03	uint16		R/W
Time	6905	FC03	uint16		R/W
DateTime Rest	6906	FC03	uint16		R/W
Modbus interface type	7990	FC03	uint16		R/W
Modbus slave address	7991	FC03	uint16		R/W
Modbus speed	7992	FC03	uint16		R/W
Modbus control switched on	8000	FC03	uint16		R/W
Request change in switch position	8001	FC03	uint16		R/W
Desired flow rate setting	8002	FC03	uint16		R/W
Request Standby	8003	FC03	uint16		R/W
Reset filter warning	8010	FC03	uint16		R/W
Appliance reset	8011	FC03	uint16		R/W

Brink Flair

Overview

Key readings

Available commands

Use cases

Installation

Things to watch for

Registers (150)

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