E19 displayed and thermostat indicates internal memory or data logging error.

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

Flash/EEPROM wear-out, Corrupted data logs, Excessive write cycles from misconfiguration, Manufacturing defect in memory chip

Safety: No mains wiring changes are required.

Steps:

Back up any configuration or schedules via the Schneider Electric app or building management system if supported.
Perform a full factory reset from the installer menu to clear stored data and logs.
Reconfigure the thermostat from scratch and monitor for recurrence of E19.
If E19 returns after a reset, the internal memory device is failing; the thermostat must be replaced.

Medium 3/5

Internal Flash / EEPROM Memory

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