Gosund
Display Backlight Power Issue
Thermostat backlight or display is very dim or flickers
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failing LED backlight driver, Loose display connector, Low supply voltage, Aging LEDs in display module
How to Fix / Troubleshooting
Warning: Turn off power to the HVAC system before removing the thermostat.
- Step 1 – Check brightness settings:
- In thermostat settings, ensure brightness is not set to minimum or night mode.
- Step 2 – Verify power:
- Confirm stable 24VAC at the thermostat (see power fault steps).
- Step 3 – Inspect display connection (advanced):
- Remove the thermostat from the wall plate.
- Check the connector between the display module and main PCB for looseness.
- Step 4 – Replace thermostat if backlight driver is failing:
- If flicker or dimness persists, the backlight driver or LEDs are failing; replace the thermostat.
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Repair Difficulty
Medium
3/5
Required Part
Display Module / LED Backlight Driver
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