Variable Registers`Const`

Registers: {
    APPL_SW_VERSION_START: 2;
    AWAY_CO2_CTRL: 20500;
    AWAY_RH_CTRL: 20499;
    AWAY_SPEED: 20501;
    AWAY_SUPPLY_TEMP: 20502;
    BOOST_CO2_CTRL: 20512;
    BOOST_RH_CTRL: 20511;
    BOOST_SPEED: 20513;
    BOOST_SUPPLY_TEMP: 20514;
    BOOST_TIME_CURRENT: 20544;
    BOOST_TIMER: 4612;
    BOOST_TIMER_ENABLED: 21766;
    CFI_EXTRACT_AIRFLOW: 46004;
    CFI_LIMITER: 32779;
    CFI_MAX_AIRFLOW: 46031;
    CFI_MIN_AIRFLOW: 46032;
    CFI_SUPPLY_AIRFLOW: 46003;
    CO2_THRESHOLD: 20491;
    CO2_VALUE: 4364;
    CRITICAL_FAULT_ACTIVE: 4621;
    CURRENT_UP_TIME_HOURS: 4619;
    CUSTOM_EXTRACT_SPEED: 20487;
    CUSTOM_SUPPLY_SPEED: 20488;
    CUSTOM_SUPPLY_TEMP: 20497;
    CUSTOM_TIME_CURRENT: 20545;
    CUSTOM_TIMER: 4613;
    CUSTOM_TIMER_ENABLED: 21767;
    DAY: 4851;
    DEFROSTING: 4611;
    EXHAUST_AIR_TEMP: 4355;
    EXTRACT_AIR_TEMP: 4354;
    EXTRACT_FAN_RPM: 4361;
    FAN_SPEED: 4353;
    FAULT_1_ACTIVITY: 36871;
    FAULT_1_CODE: 36866;
    FILTER_CHANGE_INTERVAL: 20537;
    FILTER_CHANGED_DAY: 20546;
    FILTER_CHANGED_MONTH: 20547;
    FILTER_CHANGED_YEAR: 20548;
    HOME_AWAY: 4609;
    HOME_CO2_CTRL: 20506;
    HOME_RH_CTRL: 20505;
    HOME_SPEED: 20507;
    HOME_SUPPLY_TEMP: 20508;
    HOUR: 4850;
    HR_CELL_STATUS: 4616;
    MACHINE_MODEL: 17;
    MACHINE_TYPE: 16;
    MINUTE: 4849;
    MODBUS_ADDRESS: 20482;
    MODBUS_BAUD_DIV100: 20483;
    MONTH: 4852;
    ON_OFF: 4610;
    OUTDOOR_AIR_TEMP: 4356;
    PROG_INPUT_TIMER: 4614;
    PROG_TIME_CURRENT: 20496;
    PROG_TIMER_ENABLED: 21772;
    REMAINING_FILTER_DAYS: 4620;
    RH_THRESHOLD: 20490;
    RH_VALUE: 4363;
    SERIAL_NUMBER_LSW: 15;
    SERIAL_NUMBER_MSW: 14;
    SUPPLY_AIR_TEMP: 4358;
    SUPPLY_CELL_AIR_TEMP: 4357;
    SUPPLY_FAN_RPM: 4362;
    TEMP_CONTROL_METHOD: 20549;
    TOTAL_FAULT_COUNT: 36865;
    TOTAL_UP_TIME_HOURS: 4618;
    TOTAL_UP_TIME_YEARS: 4617;
    WEEKDAY: 4854;
    WEEKLY_SCHEDULE_START: 40961;
    YEAR: 4853;
} = ...

Type Declaration

ReadonlyAPPL_SW_VERSION_START: 2

First of SW_VERSION_WORD_COUNT (9) consecutive registers holding the application software version (read-only). Each register is one version component (major, minor, patch, ...), byte-swapped, with leading all-zero components trimmed — e.g. registers reading (byte-swapped) [0,0,0,0,0,0,3,1,6] represent version "3.1.6". Reverse-engineered from the unit's own web UI (A_CYC_APPL_SW_VERSION_1 / function U() in its bundle.js) — undocumented in the Modbus RTU manual.
ReadonlyAWAY_CO2_CTRL: 20500

Away mode CO2-based control enabled (0=off, 1=on).
ReadonlyAWAY_RH_CTRL: 20499

Away mode RH-based control enabled (0=off, 1=on).
ReadonlyAWAY_SPEED: 20501

Away fan speed as a percentage.
ReadonlyAWAY_SUPPLY_TEMP: 20502

Away supply air temperature setpoint in centikelvins.
ReadonlyBOOST_CO2_CTRL: 20512

Boost mode CO2-based control enabled (0=off, 1=on).
ReadonlyBOOST_RH_CTRL: 20511

Boost mode RH-based control enabled (0=off, 1=on).
ReadonlyBOOST_SPEED: 20513

Boost fan speed as a percentage.
ReadonlyBOOST_SUPPLY_TEMP: 20514

Boost supply air temperature setpoint in centikelvins.
ReadonlyBOOST_TIME_CURRENT: 20544

Boost timer current duration setting (minutes). Written when activating boost timer mode with a duration.
ReadonlyBOOST_TIMER: 4612

Boost timer remaining minutes. 0 = not active, 65535 = indefinite.
ReadonlyBOOST_TIMER_ENABLED: 21766

Boost timer enabled (0=disabled, 1=enabled).
ReadonlyCFI_EXTRACT_AIRFLOW: 46004

CFi extract airflow (read-only).
ReadonlyCFI_LIMITER: 32779

CFi limiter register (read/write).
ReadonlyCFI_MAX_AIRFLOW: 46031

CFi maximum airflow (read/write).
ReadonlyCFI_MIN_AIRFLOW: 46032

CFi minimum airflow (read/write).
ReadonlyCFI_SUPPLY_AIRFLOW: 46003

CFi supply airflow (read-only).
ReadonlyCO2_THRESHOLD: 20491

CO2 threshold for automatic speed boost (PPM).
ReadonlyCO2_VALUE: 4364

CO2 concentration in extract air in PPM (read-only).
ReadonlyCRITICAL_FAULT_ACTIVE: 4621

Non-zero when a critical fault is active (read-only).
ReadonlyCURRENT_UP_TIME_HOURS: 4619

Runtime since the unit's most recent power-on, in hours (read-only).
ReadonlyCUSTOM_EXTRACT_SPEED: 20487

Custom mode extract fan speed as a percentage.
ReadonlyCUSTOM_SUPPLY_SPEED: 20488

Custom mode supply fan speed as a percentage.
ReadonlyCUSTOM_SUPPLY_TEMP: 20497

Custom mode supply air temperature setpoint in centikelvins.
ReadonlyCUSTOM_TIME_CURRENT: 20545

Custom timer current duration setting (minutes). Written when activating custom timer mode with a duration.
ReadonlyCUSTOM_TIMER: 4613

Custom (fireplace) timer remaining minutes. 0 = not active, 65535 = indefinite.
ReadonlyCUSTOM_TIMER_ENABLED: 21767

Custom timer enabled (0=disabled, 1=enabled).
ReadonlyDAY: 4851

Current day of month (1–31).
ReadonlyDEFROSTING: 4611

Defrosting active register (read/write). 0 = not defrosting, 1 = defrosting.
ReadonlyEXHAUST_AIR_TEMP: 4355

Exhaust air temperature in centikelvins (air expelled outdoors, read-only).
ReadonlyEXTRACT_AIR_TEMP: 4354

Extract air temperature in centikelvins (air leaving rooms, read-only).
ReadonlyEXTRACT_FAN_RPM: 4361

Extract fan speed in RPM (read-only).
ReadonlyFAN_SPEED: 4353

Fan speed as a percentage (read-only).
ReadonlyFAULT_1_ACTIVITY: 36871

Fault 1 activity register (read/write). 0 = active, 1 = solved/acknowledged. Subsequent faults: fault_n_activity = 36871 + (n-1)*6 Use faultActivityRegister(n) helper for n=1..10.
ReadonlyFAULT_1_CODE: 36866

Fault 1 code register (read-only). Subsequent faults are 6 registers apart: fault_n_code = 36866 + (n-1)*6 Use faultCodeRegister(n) helper for n=1..10.
ReadonlyFILTER_CHANGE_INTERVAL: 20537

Filter change interval in days (read/write).
ReadonlyFILTER_CHANGED_DAY: 20546

Filter changed day of month.
ReadonlyFILTER_CHANGED_MONTH: 20547

Filter changed month (1–12).
ReadonlyFILTER_CHANGED_YEAR: 20548

Filter changed year as a 2-digit offset from 2000 (e.g. 26 for 2026).
ReadonlyHOME_AWAY: 4609

Home/Away mode register. 0 = Home, 1 = Away.
ReadonlyHOME_CO2_CTRL: 20506

Home mode CO2-based control enabled (0=off, 1=on).
ReadonlyHOME_RH_CTRL: 20505

Home mode RH-based control enabled (0=off, 1=on).
ReadonlyHOME_SPEED: 20507

Home fan speed as a percentage.
ReadonlyHOME_SUPPLY_TEMP: 20508

Home supply air temperature setpoint in centikelvins.
ReadonlyHOUR: 4850

Current hour (0–23).
ReadonlyHR_CELL_STATUS: 4616

Heat recovery cell status (read-only). 0 = heat recovery, 1 = cool recovery, 2 = bypass, 3 = defrost.
ReadonlyMACHINE_MODEL: 17

Machine model code (read-only). Look up in MACHINE_MODELS (see device-catalog.ts) to get the model name (e.g. "Vallox 110 MV"). Reverse-engineered from the unit's own web UI — undocumented in the Modbus RTU manual.
ReadonlyMACHINE_TYPE: 16

Machine type code (read-only). Look up in MACHINE_TYPES (see device-catalog.ts) to get the type designation (e.g. "A3702"). Reverse-engineered from the unit's own web UI — undocumented in the Modbus RTU manual.
ReadonlyMINUTE: 4849

Current minute (0–59).
ReadonlyMODBUS_ADDRESS: 20482

Modbus unit address (read/write).
ReadonlyMODBUS_BAUD_DIV100: 20483

Modbus baud rate divided by 100 (read/write).
ReadonlyMONTH: 4852

Current month (1–12).
ReadonlyON_OFF: 4610

Power on/off register. 0 = on, 5 = off.
ReadonlyOUTDOOR_AIR_TEMP: 4356

Outdoor air temperature in centikelvins (fresh incoming air, read-only).
ReadonlyPROG_INPUT_TIMER: 4614

Programmable (extra) timer remaining minutes. 0 = not active, 65535 = indefinite.
ReadonlyPROG_TIME_CURRENT: 20496

Programmable timer current duration setting (minutes). Written when activating programmable timer mode with a duration.
ReadonlyPROG_TIMER_ENABLED: 21772

Programmable timer enabled (0=disabled, 1=enabled).
ReadonlyREMAINING_FILTER_DAYS: 4620

Remaining days until filter change required (read-only).
ReadonlyRH_THRESHOLD: 20490

RH threshold for automatic speed boost (percent).
ReadonlyRH_VALUE: 4363

Relative humidity of extract air in percent (read-only).
ReadonlySERIAL_NUMBER_LSW: 15

Serial number, least significant word (read-only). Combine with SERIAL_NUMBER_MSW.
ReadonlySERIAL_NUMBER_MSW: 14

Serial number, most significant word (read-only). Combine with SERIAL_NUMBER_LSW.
ReadonlySUPPLY_AIR_TEMP: 4358

Supply air temperature delivered to rooms in centikelvins (read-only).
ReadonlySUPPLY_CELL_AIR_TEMP: 4357

Supply air temperature at HR cell output in centikelvins (read-only).
ReadonlySUPPLY_FAN_RPM: 4362

Supply fan speed in RPM (read-only).
ReadonlyTEMP_CONTROL_METHOD: 20549

Temperature control method. 0 = supply air, 1 = extract air, 2 = cooling, 3 = air heating.
ReadonlyTOTAL_FAULT_COUNT: 36865

Total number of stored fault entries (read-only).
ReadonlyTOTAL_UP_TIME_HOURS: 4618

Total lifetime runtime, hours within the current year (read-only). Combine with TOTAL_UP_TIME_YEARS.
ReadonlyTOTAL_UP_TIME_YEARS: 4617

Total lifetime runtime in whole years (read-only). Combine with TOTAL_UP_TIME_HOURS.
ReadonlyWEEKDAY: 4854

Current weekday (1=Monday, 7=Sunday).
ReadonlyWEEKLY_SCHEDULE_START: 40961

First register of the 168-register weekly schedule block. Registers 40961–41128 (168 values, one per hour Mon–Sun 00:00–23:00). Values: 0=None, 1=Home, 2=Away, 3=Boost.
ReadonlyYEAR: 4853

Current year as a 2-digit offset from 2000 (e.g. 26 for 2026).

Variable RegistersConst

Type Declaration

ReadonlyAPPL_SW_VERSION_START: 2

ReadonlyAWAY_CO2_CTRL: 20500

ReadonlyAWAY_RH_CTRL: 20499

ReadonlyAWAY_SPEED: 20501

ReadonlyAWAY_SUPPLY_TEMP: 20502

ReadonlyBOOST_CO2_CTRL: 20512

ReadonlyBOOST_RH_CTRL: 20511

ReadonlyBOOST_SPEED: 20513

ReadonlyBOOST_SUPPLY_TEMP: 20514

ReadonlyBOOST_TIME_CURRENT: 20544

ReadonlyBOOST_TIMER: 4612

ReadonlyBOOST_TIMER_ENABLED: 21766

ReadonlyCFI_EXTRACT_AIRFLOW: 46004

ReadonlyCFI_LIMITER: 32779

ReadonlyCFI_MAX_AIRFLOW: 46031

ReadonlyCFI_MIN_AIRFLOW: 46032

ReadonlyCFI_SUPPLY_AIRFLOW: 46003

ReadonlyCO2_THRESHOLD: 20491

ReadonlyCO2_VALUE: 4364

ReadonlyCRITICAL_FAULT_ACTIVE: 4621

ReadonlyCURRENT_UP_TIME_HOURS: 4619

ReadonlyCUSTOM_EXTRACT_SPEED: 20487

ReadonlyCUSTOM_SUPPLY_SPEED: 20488

ReadonlyCUSTOM_SUPPLY_TEMP: 20497

ReadonlyCUSTOM_TIME_CURRENT: 20545

ReadonlyCUSTOM_TIMER: 4613

ReadonlyCUSTOM_TIMER_ENABLED: 21767

ReadonlyDAY: 4851

ReadonlyDEFROSTING: 4611

ReadonlyEXHAUST_AIR_TEMP: 4355

ReadonlyEXTRACT_AIR_TEMP: 4354

ReadonlyEXTRACT_FAN_RPM: 4361

ReadonlyFAN_SPEED: 4353

ReadonlyFAULT_1_ACTIVITY: 36871

ReadonlyFAULT_1_CODE: 36866

ReadonlyFILTER_CHANGE_INTERVAL: 20537

ReadonlyFILTER_CHANGED_DAY: 20546

ReadonlyFILTER_CHANGED_MONTH: 20547

ReadonlyFILTER_CHANGED_YEAR: 20548

ReadonlyHOME_AWAY: 4609

ReadonlyHOME_CO2_CTRL: 20506

ReadonlyHOME_RH_CTRL: 20505

ReadonlyHOME_SPEED: 20507

ReadonlyHOME_SUPPLY_TEMP: 20508

ReadonlyHOUR: 4850

ReadonlyHR_CELL_STATUS: 4616

ReadonlyMACHINE_MODEL: 17

ReadonlyMACHINE_TYPE: 16

ReadonlyMINUTE: 4849

ReadonlyMODBUS_ADDRESS: 20482

ReadonlyMODBUS_BAUD_DIV100: 20483

ReadonlyMONTH: 4852

ReadonlyON_OFF: 4610

ReadonlyOUTDOOR_AIR_TEMP: 4356

ReadonlyPROG_INPUT_TIMER: 4614

ReadonlyPROG_TIME_CURRENT: 20496

ReadonlyPROG_TIMER_ENABLED: 21772

ReadonlyREMAINING_FILTER_DAYS: 4620

ReadonlyRH_THRESHOLD: 20490

ReadonlyRH_VALUE: 4363

ReadonlySERIAL_NUMBER_LSW: 15

ReadonlySERIAL_NUMBER_MSW: 14

ReadonlySUPPLY_AIR_TEMP: 4358

ReadonlySUPPLY_CELL_AIR_TEMP: 4357

ReadonlySUPPLY_FAN_RPM: 4362

ReadonlyTEMP_CONTROL_METHOD: 20549

ReadonlyTOTAL_FAULT_COUNT: 36865

ReadonlyTOTAL_UP_TIME_HOURS: 4618

ReadonlyTOTAL_UP_TIME_YEARS: 4617

ReadonlyWEEKDAY: 4854

ReadonlyWEEKLY_SCHEDULE_START: 40961

ReadonlyYEAR: 4853

Settings

Variable Registers`Const`

`Readonly`APPL_SW_VERSION_START: 2

`Readonly`AWAY_CO2_CTRL: 20500

`Readonly`AWAY_RH_CTRL: 20499

`Readonly`AWAY_SPEED: 20501

`Readonly`AWAY_SUPPLY_TEMP: 20502

`Readonly`BOOST_CO2_CTRL: 20512

`Readonly`BOOST_RH_CTRL: 20511

`Readonly`BOOST_SPEED: 20513

`Readonly`BOOST_SUPPLY_TEMP: 20514

`Readonly`BOOST_TIME_CURRENT: 20544

`Readonly`BOOST_TIMER: 4612

`Readonly`BOOST_TIMER_ENABLED: 21766

`Readonly`CFI_EXTRACT_AIRFLOW: 46004

`Readonly`CFI_LIMITER: 32779

`Readonly`CFI_MAX_AIRFLOW: 46031

`Readonly`CFI_MIN_AIRFLOW: 46032

`Readonly`CFI_SUPPLY_AIRFLOW: 46003

`Readonly`CO2_THRESHOLD: 20491

`Readonly`CO2_VALUE: 4364

`Readonly`CRITICAL_FAULT_ACTIVE: 4621

`Readonly`CURRENT_UP_TIME_HOURS: 4619

`Readonly`CUSTOM_EXTRACT_SPEED: 20487

`Readonly`CUSTOM_SUPPLY_SPEED: 20488

`Readonly`CUSTOM_SUPPLY_TEMP: 20497

`Readonly`CUSTOM_TIME_CURRENT: 20545

`Readonly`CUSTOM_TIMER: 4613

`Readonly`CUSTOM_TIMER_ENABLED: 21767

`Readonly`DAY: 4851

`Readonly`DEFROSTING: 4611

`Readonly`EXHAUST_AIR_TEMP: 4355

`Readonly`EXTRACT_AIR_TEMP: 4354

`Readonly`EXTRACT_FAN_RPM: 4361

`Readonly`FAN_SPEED: 4353

`Readonly`FAULT_1_ACTIVITY: 36871

`Readonly`FAULT_1_CODE: 36866

`Readonly`FILTER_CHANGE_INTERVAL: 20537

`Readonly`FILTER_CHANGED_DAY: 20546

`Readonly`FILTER_CHANGED_MONTH: 20547

`Readonly`FILTER_CHANGED_YEAR: 20548

`Readonly`HOME_AWAY: 4609

`Readonly`HOME_CO2_CTRL: 20506

`Readonly`HOME_RH_CTRL: 20505

`Readonly`HOME_SPEED: 20507

`Readonly`HOME_SUPPLY_TEMP: 20508

`Readonly`HOUR: 4850

`Readonly`HR_CELL_STATUS: 4616

`Readonly`MACHINE_MODEL: 17

`Readonly`MACHINE_TYPE: 16

`Readonly`MINUTE: 4849

`Readonly`MODBUS_ADDRESS: 20482

`Readonly`MODBUS_BAUD_DIV100: 20483

`Readonly`MONTH: 4852

`Readonly`ON_OFF: 4610

`Readonly`OUTDOOR_AIR_TEMP: 4356

`Readonly`PROG_INPUT_TIMER: 4614

`Readonly`PROG_TIME_CURRENT: 20496

`Readonly`PROG_TIMER_ENABLED: 21772

`Readonly`REMAINING_FILTER_DAYS: 4620

`Readonly`RH_THRESHOLD: 20490

`Readonly`RH_VALUE: 4363

`Readonly`SERIAL_NUMBER_LSW: 15

`Readonly`SERIAL_NUMBER_MSW: 14

`Readonly`SUPPLY_AIR_TEMP: 4358

`Readonly`SUPPLY_CELL_AIR_TEMP: 4357

`Readonly`SUPPLY_FAN_RPM: 4362

`Readonly`TEMP_CONTROL_METHOD: 20549

`Readonly`TOTAL_FAULT_COUNT: 36865

`Readonly`TOTAL_UP_TIME_HOURS: 4618

`Readonly`TOTAL_UP_TIME_YEARS: 4617

`Readonly`WEEKDAY: 4854

`Readonly`WEEKLY_SCHEDULE_START: 40961

`Readonly`YEAR: 4853