Readings held or stale

Why a value is HELD, the horizons involved, sensor fault and stuck alerts, DHT disagreement, and rejected readings.

A HELD chip means the desk is showing the last good value because nothing fresher has arrived within the stale horizon. Hover it for the age. It becomes a fault only when an alert says so.

• Room and tent temperature, RH, VPD: the hub's sensors. If everything is HELD at once, see Hub offline.
• Canopy, intake, exhaust, outdoors: a placed Zigbee or Tuya sensor. Past its stale window (Settings › Sensors › Placed sensor stale window, 30 min by default) it drops out. Battery, range, or the coordinator (see Zigbee radio down).
• Moisture, EC, pH, soil °C: a probe. See Probe dark or faulted.
• Tank: the water tester over Tuya.

• Climate sensor fault / Root-zone probes (critical): the hub does not trust its own sensor. Failsafe may follow.
• Climate sensor stuck (critical): the value has not changed for too long; the ladder would steer on a stale number.
• Climate reading rejected (critical): outside the plausible clamps. Check the sensor, not the clamps first.
• DHT disagreement: the two tent sensors differ by more than the threshold; one alert names both zones. Compare with a hand meter and set an offset under Settings › Sensors for the one that is off.

When the desks draw HELD and when a flapping device is called offline are Preferences (Reading stale horizon, Offline cooldown). They change what you see, not what the kit does. A phone with a slow connection can show HELD that a laptop on the LAN does not.

Guide contents  ·  Troubleshooting  ·  Troubleshooting  ·  Digital Stealth Care

DSC-Brain user guide · Readings held or stale · this page is edited on the site; the Notion original was retired after the mirror