Worcester Bosch Unstable internal power or firmware crash

Thermostat frequently reboots or restarts on its own.

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

Weak batteries, Faulty power regulator, Overheating, Corrupted firmware

Safety first: Work only on the thermostat.

Replace batteries or check power: Fit new batteries or ensure the mains power supply is stable and not shared with high‑load devices that cause dips.
Ventilation: Ensure the thermostat is not installed in a very hot, enclosed space.
Firmware update/reset: Update firmware if possible, or perform a factory reset after backing up settings.
If reboots persist: Internal hardware fault is likely; replace the thermostat.

Medium 3/5

Smart Thermostat Main PCB

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