This is product is discontinued and replaced with ZEN72.
Flickering may be caused by a driver incompatibility between the bulb and dimmer.
The executive element in the ZEN22 Dimmer switches is TRIAC, a leading edge driver. If an LED bulb uses a trailing edge driver, this may lead to flickering.
If you're seeing flickering on your lights, we'd recommend either adding a bypass to the load or trying a ZEN27/ZEN77 dimmer since these models use a MOSFET (trailing edge / ELV dimming).
Also, make sure the type of LED bulb you're using is labeled as dimmable. On/off LED bulbs are not compatible with dimmers and will not perform correctly.
Never use a Z-Wave dimmer with smart bulbs unless you disable paddle control on them first. Dimming smart bulbs from a wall dimmer may damage your equipment.
If you have any more questions about flickering or compatible bulbs, don't hesitate to reach out to our team!