# Thermostat screen is blank

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

Source: https://helpdox.fekbd.com/docs/halo-thermostat/troubleshoot/thermostat-screen-is-blank/

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. 1Check the breakerMake sure the breaker for your heating system is on.
2. 2Close the furnace doorMany furnaces cut power when their door switch is open.
3. 3Check the C wireWithout 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).