Wentilo
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Wentilo heat recovery unit — first start-up — follow the steps below in order to correctly update and configure the device.
Step 1 of 14
Download and install the iCONNECT app
Install the app on your mobile device, launch it and grant all required permissions (Bluetooth, location).
Step 2 of 14
Log in to your iCONNECT account
Register or log in to your iCONNECT account in the app.
💡 Note
If the app becomes unresponsive at any step — close and reopen the app, then repeat that step.
Step 3 of 14
Enable Bluetooth communication
Switch the heat recovery unit control panel from Wi-Fi to Bluetooth.
For iSWITCH Ti: press and hold the [on/off] icon 
until all panel indicators begin flashing. Rapid flashing (several times per second) = Bluetooth active.
until all panel indicators begin flashing. Rapid flashing (several times per second) = Bluetooth active.
For iSENSE 5i: on the home screen tap:
User Menu ➜ Settings ➜ Wi-Fi ➜ Mode — switch from WiFi to BT
Letters BT in the top bar = Bluetooth active.
💡 Note
If the app becomes unresponsive at any step — close and reopen the app, then repeat that step.
Step 4 of 14
Search for the unit in the app
Connect to the heat recovery unit via Bluetooth.
At the bottom of the app screen tap:
[BT] ➜ [Search for devices] ➜ select the detected [Internet Module] 
💡 Note
If the app becomes unresponsive at any step — close and reopen the app, then repeat that step.
Step 5 of 14
Download update files
Download all required files — panel firmware, unit firmware and factory configuration snapshot. Start by selecting your control panel.
Select the panel model installed at the unit.
Step 5 of 14
Select your panel hardware version
The HW version is printed on the panel's rating plate. Download the file and save it to a microSD card (FAT32, max 32 GB).
Step 5 of 14
Download the unit firmware
Extract the downloaded ZIP file — you need the *.pfi file for the update.
Step 5 of 14
Unit series
The first two letters of the code on the unit's rating plate.
Know the full model code? Enter it directly, e.g.
IT450 S1 AAModel not found — check the code and try again.
Step 5 of 14
Unit capacity
The three-digit number after the series code — e.g. IC180, IT450.
Step 5 of 14
Heat exchanger & control type
E = airENTHALPY · S = airENERGY
1 = iEDGE · 4 = iEDGE SMART
Step 5 of 14
Installation side
Relative to the front of the unit, from the service panel side.
Step 5 of 14
Download the configuration snapshot
Extract the downloaded ZIP file — you need the *.json file.
💡 Note
If the app becomes unresponsive at any step — close and reopen the app, then repeat that step.
Step 6 of 14
Extract and prepare the downloaded files
Extract the downloaded ZIP files, rename them as needed and save them to your mobile device's storage. Make sure you have:
Files you should have:
1. Unit firmware file — *.pfi
2. Factory configuration snapshot — *.json (extracted from ZIP)
3. Panel firmware file — *.pfc (iSENSE, on microSD card) or *.bin (iSWITCH, in phone storage)
1. Unit firmware file — *.pfi
2. Factory configuration snapshot — *.json (extracted from ZIP)
3. Panel firmware file — *.pfc (iSENSE, on microSD card) or *.bin (iSWITCH, in phone storage)
💡 Note
If the app becomes unresponsive at any step — close and reopen the app, then repeat that step.
Step 7 of 14
Update the control panel
iSENSE 5i
Copy the downloaded *.pfc file to a microSD card (FAT32, max 32 GB). Insert the card into the slot on the bottom of the panel. On the panel screen tap [Panel] → [Confirm]. Wait for the update to complete, then remove the card.
Copy the downloaded *.pfc file to a microSD card (FAT32, max 32 GB). Insert the card into the slot on the bottom of the panel. On the panel screen tap [Panel] → [Confirm]. Wait for the update to complete, then remove the card.
iSWITCH Ti
In the iCONNECT app tap: [Wrench icon]
➜ password: check code (login required) ➜ OK ➜ [Find and add update file] ➜ select the *.bin file ➜ [Start update process]
Follow the on-screen instructions.
In the iCONNECT app tap: [Wrench icon]
➜ password: check code (login required) ➜ OK ➜ [Find and add update file] ➜ select the *.bin file ➜ [Start update process]
Follow the on-screen instructions.
💡 Note
If the app becomes unresponsive at any step — close and reopen the app, then repeat that step.
Step 8 of 14
Update the unit firmware
In the iCONNECT app tap:
[Ventilation Controller] ➜ [Wrench icon] ➜ [Firmware update] ➜ password: check code (login required) ➜ OK ➜ [Find and add update file] ➜ select the *.pfi file ➜ [Start update process]
The process may take several minutes. Leave the device undisturbed.
➜ [Firmware update] ➜ password: check code (login required) ➜ OK ➜ [Find and add update file] ➜ select the *.pfi file ➜ [Start update process]
The process may take several minutes. Leave the device undisturbed.
⏳ Warning
Do not change any unit settings during the update. Wait for the success notification.
💡 Note
If the app becomes unresponsive at any step — close and reopen the app, then repeat that step.
Step 9 of 14
Restore factory settings
In the iCONNECT app tap:
[Ventilation Controller] ➜ [Service settings] ➜ password: check code (login required) ➜ OK ➜ at the bottom, grey toggle [Default settings]
The grey toggle will turn green. Wait until the green toggle returns to grey — this signals the process is complete. Return to the home screen.
💡 Note
If the app becomes unresponsive at any step — close and reopen the app, then repeat that step.
Step 10 of 14
Import the factory configuration snapshot
In the iCONNECT app tap:
[Ventilation Controller] ➜ [Wrench icon] ➜ Configuration snapshots ➜ password: check code (login required) ➜ OK ➜ [Import configuration snapshot] ➜ select the downloaded *.json file
Follow the on-screen instructions in the app.
➜ Configuration snapshots ➜ password: check code (login required) ➜ OK ➜ [Import configuration snapshot] ➜ select the downloaded *.json file
Follow the on-screen instructions in the app.
💡 Note
If the app becomes unresponsive at any step — close and reopen the app, then repeat that step.
Step 11 of 14
Load the configuration snapshot
In the iCONNECT app tap:
[Ventilation Controller] ➜ [Wrench icon] ➜ Configuration snapshots ➜ password: check code (login required) ➜ OK ➜ [Load configuration snapshot] ➜ select the imported *.json file
Loading takes around 10–15 seconds. Leave the device undisturbed.
➜ Configuration snapshots ➜ password: check code (login required) ➜ OK ➜ [Load configuration snapshot] ➜ select the imported *.json file
Loading takes around 10–15 seconds. Leave the device undisturbed.
⏳ Warning
Do not interrupt the configuration snapshot loading process.
💡 Note
If the app becomes unresponsive at any step — close and reopen the app, then repeat that step.
Step 12a of 14
Reset filter run-time
Applies to: iEDGE (type E1 / S1)
If your unit uses the iEDGE SMART system (type E4 / S4), skip this step.
In the iCONNECT app tap:
[Ventilation Controller] ➜ [User settings] ➜ [Advanced settings] ➜ [Filters] ➜ grey toggle [Reset filter run-time]
The grey toggle will turn green. Wait until the green toggle returns to grey. Return to the home screen.
💡 Note
If the app becomes unresponsive at any step — close and reopen the app, then repeat that step.
Step 12b of 14
Calibrate filter operation
Applies to: iEDGE SMART (type E4 / S4)
If your unit uses the iEDGE system (type E1 / S1) — this step does not apply, proceed to the next one.
In the iCONNECT app tap:
[Ventilation Controller] ➜ [User settings] ➜ [Advanced settings] ➜ [Filters] ➜ grey toggle [Force filter replacement procedure] ➜ [Start calibration? YES] ➜ OK
Follow the on-screen instructions. If a [Calibration Error] message appears — check the filter condition.
💡 Note
If the app becomes unresponsive at any step — close and reopen the app, then repeat that step.
Step 13 of 14
Calibrate the fan operating range
Applies to: iEDGE SMART (type E4 / S4)
If your unit uses the iEDGE system (type E1 / S1) — this step does not apply, proceed to the next one.
In the iCONNECT app tap:
[Ventilation Controller] ➜ [Service settings] ➜ password: check code (login required) ➜ OK ➜ [Fan settings] ➜ [Constant flow — control calibration] ➜ grey toggle [Activate calibration]
The grey toggle will turn green. Calibration starts automatically. Wait until the process finishes, then tap [End calibration] and return to the home screen.
⏳ Warning
Resolve all unit faults before calibration. View faults via the ⚠ icon at the bottom of the screen.
💡 Note
If the app becomes unresponsive at any step — close and reopen the app, then repeat that step.
Step 14 of 14
Switch the panel back to Wi-Fi and finish
Switch the control panel from Bluetooth mode back to Wi-Fi.
iSWITCH Ti
Press and hold the [on/off] icon until the indicators begin flashing. Slow flashing (once per second) or steady light = Wi-Fi active.
Press and hold the [on/off] icon
until the indicators begin flashing. Slow flashing (once per second) or steady light = Wi-Fi active.
iSENSE 5i
On the home screen tap: User Menu ➜ Settings ➜ WiFi ➜ Mode — switch from BT to WiFi
On the home screen tap: User Menu ➜ Settings ➜ WiFi ➜ Mode — switch from BT to WiFi
✓ First start-up complete
All 14 steps completed
The panel, unit and configuration have been updated. The device is ready for operation.
💡 Note
If the app becomes unresponsive at any step — close and reopen the app, then repeat that step.
