Thermostat display is on but screen is very dim or unreadable

Safety first: Turn off power at the breaker before removing the thermostat if you need to inspect it.

Steps to address dim display:

• 1. Adjust brightness settings:
  • Check the thermostat menu for backlight or brightness options and increase if available.
• 2. Power cycle:
  • Turn off power for a few minutes and restore to see if brightness returns.
• 3. Check for heat sources:
  • Ensure the thermostat is not exposed to continuous high temperatures which can age the display.
• 4. Replace front module:
  • If the display remains dim and unreadable, the backlight or driver has likely failed; replace the thermostat front/display module.

When to call a professional: For in‑warranty devices, contact Fibaro support or your installer for a replacement rather than attempting internal repairs.