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Why is the TKB Dimmer Socket no longer a certified device?

Question

Why is the TKB TZ67 Dimmer Socket no longer a certified device?

Answer

In the past week or so a few customers reported a couple of issues with the TKB TZ67 Dimmer Socket and upon further investigation and testing we confirmed that those issues exist as follows:

  • "Soft-on" doesn't work when the TKB TZ67 Dimmer Socket is controlled over Z-Wave from a Primary or Secondary Controller.
  • "Spamming" the on / off control of the TKB TZ67 Dimmer Socket over Z-Wave from a Primary or Secondary Controller results in strange behaviour where subsequent requests to turn the TKB TZ67 Dimmer Socket off will fail. The dim level can still be set over Z-Wave at this point, but it can't be set to 0%. Operating the TKB TZ67 Dimmer Socket using the local button will restore correct Z-Wave operation.?

The following additional tests worked correctly:

  • "Soft-on" and "Soft-off" work 100% correctly from the local button.
  • "Soft-on" and "Soft-off" work 100% correctly when the TKB TZ67 Dimmer Socket is controlled over Z-Wave from an Associated device that sends a Basic on / Basic off.
  • "Soft-off" always works when the TKB TZ67 Dimmer Socket is controlled over Z-Wave from a Primary or Secondary Controller.
  • "Spamming" the on / off control of the TKB TZ67 Dimmer Socket over Z-Wave from an Associated device that sends a Basic on / Basic off doesn't cause any strange behaviour.

All tests were carried out with a variety of bulbs - LEDs, eco-Halogen and Incandescent of different wattages.

Solution

Vesternet believe that the issue with the locking up of the device is caused by an extreme set of circumstances and we don't really see how the locking up would occur under normal use. The TKB TZ67 Dimmer Socket has been on sale for a long time now, we ourselves have sold 1000's of them so the total sales worldwide must be many, many times that amount and this is the first time we've heard this problem reported.

The soft-on / soft-off issue is a strange one as it's not 100% clear what the correct behaviour should be - there are other dimmer sockets that have soft-on / soft-off working consistently, but there are some that don't do either soft-on or soft-off. An example is the Popp Dimmer Socket - this does soft-off (and is also configurable for the delay time to turn off) but doesn't do soft-on at all.


It's therefore our opinion that these issues do not detract from the fact that the TKB TZ67 Dimmer Socket is a great product at a great price!


Updated: 30/04/2014

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