Thermostat displays E20 and the app reports ‘Internal memory error’; settings may not be saved.

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

Worn-out flash memory cells on thermostat PCB, Corrupted configuration data, Power loss during write operations, Manufacturing defect in memory chip

Safety: No user-serviceable parts inside; do not open the thermostat.

Backup settings: Ensure your Ngenic account is syncing settings to the cloud.
Factory reset: Perform a factory reset from the thermostat menu or app to clear corrupted data, then reconfigure.
Avoid power interruptions: Do not cut power while the thermostat is saving settings or updating firmware.

If E20 reappears after a reset, the internal memory chip is likely failing. The Ngenic thermostat should be replaced.

Medium 3/5

Ngenic Thermostat Display/Control Unit

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