I have five of Heiman smoke detectors as well and their connections work great in my setup (with ZBT-2 adapter as Zigbee Coordinator for ZHA), so issue you see is likley your setup. Highly recommend you read and try follow my best-practice guide for Zigbee here → Zigbee network optimization: a how-to guide for avoiding radio frequency interference + adding Zigbee Router devices (repeaters/extenders) to get a stable Zigbee network mesh with best possible range and coverage by fully utilizing Zigbee mesh networking
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