Immergas Display Backlight Instability

Thermostat backlight flickers or brightness changes unexpectedly

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.

Possible Causes

Fluctuating supply voltage, Failing backlight driver circuit, Loose connector between display and PCB, Firmware dimming bug

Safety: Turn off power before removing the thermostat cover.

Step 1 – Check power source: Ensure the thermostat is not powered from a switched or dimmed circuit.
Step 2 – Disable auto-dimming: In settings, turn off any automatic brightness adjustment to see if flicker stops.
Step 3 – Reseat connectors: A technician can reseat the display connector on the main PCB.
Step 4 – Replace thermostat: Persistent flicker usually indicates a failing backlight driver; replace the thermostat.

Medium 3/5

Immergas thermostat display and touch panel module

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