DSC-BRAIN USER GUIDE · TROUBLESHOOTING

Lamp and photoperiod surprises

Lamp on in the dark period, lamp off in the window, catch-up turning it on, hub clock invalid, the 4×8 the hub cannot see, and lamp plugs holding state.

●  verified for 9.0.0 · firmware train 8.2.0.0

●  last verified 2026-09-17 · mirrored 2026-09-15

Lamp came on when I released a hold

That is catch-up: the hub makes up missed lit hours, and releasing a hold during catch-up turns the lamp on. The desk's Cancel catch-up needs a newer hub firmware to act. Keep the hold on until the window passes, or accept the catch-up.

Lamp off inside its window (2×4 MISSING IN WINDOW)

  1. Manual light hold on? Clear it (the roll-on dialog tells you what will happen).
  2. Auto photoperiod off under Settings › Light?
  3. Hub clock invalid (Settings › System › Time): the hub thinks it is a different time. Give it internet for SNTP or set local time at fleet setup.
  4. The SF1000's own dimming knob at zero: the lamp's hardware overrides the hub. The light control path row says so.
  5. A dark period violation guard: the hub refuses to light inside the minimum dark hours.
  6. A Safety cut-off is active: a smoke, gas or CO alarm carrying that task switched the lamp plugs (Lamp plug · 4×8, Lamp plug · 2×4) off and holds them off until you release it under Settings › Devices › Zigbee › Safety cut-off. Hub-dimmed fixtures are not cut.

Lamp on in the dark period (critical)

A hold left on, a manual toggle, or a lamp plug with an on schedule left in the vendor app. Clear the hold; remove any on-schedule from the plug (keep only an off-only schedule).

The 4×8 says lit but the tent is dark (or the reverse)

The hub has no output and no sensor for the 4×8 lamp. Bind a plug to the Lamp plug · 4×8 role: the brain switches it from the hub's window, and the Light desk counts the 4×8's hours from the plug's reported on-time (Got · Lamp plug). That is power at the socket, not a light reading. With no plug the hours come from the photoperiod window (Got · Window). Black camera frames do not prove a dark tent either.

Lamp plug stuck on after a brain restart

A Tuya or Zigbee plug holds its last state when the brain stops. The off-only schedule on the plug is the backstop; set one.

Guide contents  ·  Troubleshooting  ·  Troubleshooting  ·  Digital Stealth Care

DSC-Brain user guide · Lamp and photoperiod surprises · this page is edited on the site; the Notion original was retired after the mirror