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Thermostat screen is blank

A blank screen usually means no power to the base — check the breaker, the furnace door and the C wire.

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A blank screen usually means no power to the base — check the breaker, the furnace door and the C wire. Follow the steps below — it takes just a few minutes.

Before you begin#

  • A Phillips screwdriver and the Halo app
  • Power to your heating system switched off at the breaker

Steps#

  1. Check the breaker#

    Make sure the breaker for your heating system is on.

  2. Close the furnace door#

    Many furnaces cut power when their door switch is open.

  3. Check the C wire#

    Without a C wire, Halo’s battery drains. Install the power adapter.

Tip

Still blank after 10 minutes? Start a warranty claim — we ship a replacement in 2 days.

Still stuck?#

Have your serial number ready (Settings → About on the thermostat, or the label on the back plate).

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