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ZEN26 S2 Switch Change Log
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Here is a log of upgrades and improvements we made to the S2 ZEN26 model so far.

VER. 1.0 (released 10/2018)

Original release.

Firmware: 1.0

  • Included S2 security, OTA firmware updates, built-in auto-off timer (set in seconds)

VER. 2.0 (released 6/2019)


  • Made the LED indicator smaller
  • Terminal screws arrive loose (unscrewed) for easier installation
  • Added foam to packaging

Firmware: 2.0

  • Added full scene control
  • Changed association settings to send separate reports for manual and Z-Wave control
  • Added auto-on timer and changed timer setting (from seconds to minutes)
  • Added the ability to control load by pressing any of the paddles
  • Added the ability to physical local control

VER. 2.01

Firmware: 2.01

  • Reduced manual control delay related to scene control functionality

VER. 2.02

Firmware: 2.02

  • Added on/off reports to the hub and LED indicator status changes with disabled physical / Z-Wave control
  • Fixed behavior and reports for on/off control without a connected load
  • Fixed issues with behavior after power outage

VER. 2.03

Firmware: 2.03

  • Added the ability to disable Z-Wave control together with physical control
  • Added the ability to adjust reporting behavior for disabled physical control

VER. 3.0 (released 9/2020)


  • Removed side heat sink tabs

Firmware: 3.0

  • Changed the paddle sequence for enabling smart bulb mode (aka disabling the relay / physical control) to 4-down-and-hold for 10 seconds (tap the lower paddle down-down-down-down'n'hold)

VER. 3.01 (released 9/2020 as OTA)

Firmware: 3.01

  • Corrected the reporting behavior for smart bulb mode with physical and Z-Wave control disabled
  • Applied timers to status reports in smart bulb mode
  • Improved single-tap and long-tap timing for scene control triggers

VER. 3.02 (released 10/2020 as OTA)

Firmware: 3.02

  • Changed power outage behavior in smart bulb mode

VER. 3.04 (released 2/2021)

Firmware: 3.04

  • Changed direct association group 2 behavior (the switch now sends a report whenever a paddle is tapped, regardless of its state)

VER. 3.50 (released as OTA 9/2021)

Firmware: 3.50

  • Fixed issues with the supervision command class
  • Added a setting to change scene control paddle mapping (parameter 14)
  • Added a setting to disable programming from paddles (parameter 15)
  • Reduced manual control delay related to scene control functionality


This model has been discontinued and replaced with the ZEN76 switch. No further updates are planned for the ZEN26 device.

Your ZEN26 switch can be updated via OTA firmware updates, here is how to do that. You'll be able to access all firmware files here once you register your product and create an account in our support portal. Questions? Feel free reach out to our customer service, we reply 7 days a week!

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