Worcester Bosch Non‑volatile memory instability

Smart thermostat schedules randomly reset or revert to default.

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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 EEPROM/flash, Power interruptions during writes, Firmware bug, Excessive temperature affecting electronics

How to Fix / Troubleshooting

Safety first: No mains work is required.

  • Stable power: Ensure batteries are fresh or that mains supply to the thermostat is not being frequently switched off.
  • Firmware update: Apply any available updates that may address memory handling.
  • Factory reset and reprogram: Perform a full reset, then carefully re‑enter schedules.
  • If resets continue: The internal memory is likely failing; replace the thermostat.
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Repair Difficulty

Medium 3/5

Required Part

Smart Thermostat Main PCB
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