Vacuum suction won't work

Here's what Roomba has to say about error 26.

Roomba i Series: Error 26

== Roomba i Series: Error 26 ==

Error twenty-six (26) means the vacuum is experiencing insufficient airflow.

It is recommended that you clean or replace the bin filter. Then try to run the robot again. 

If the error persists, please reboot the robot by holding the clean button for about twenty (20) seconds). Doing so should clear the error from the robot's memory.

If the error persists after replacing the bin filter and rebooting the robot, the Cleaning Head Module will need to be replaced.

If you need to purchase a new cleaning head module, please visit the iRobot Store - Parts and Accessories or use an authorized retailer to order a part. If you believe you're in warranty, please contact iRobot Customer Care.

Took a bit of research, but here's the cleaning head module for your vacuum.

Roomba® Cleaning Head Module - i3 & j7 Series - iRobot®

I know the page title says i3 and j7, but the description includes several other models, including yours.

Replacement Cleaning Head Module, compatible with Roomba® e, i & j (excluding j9+) Series Robot Vacuums purchased before July 15, 2024 only. Not compatible with Roomba Combo® j7+, j9+ or 10 Max robots