Thermostat frequently reboots or restarts on its own.

Safety first: Isolate power before checking wiring.

Steps to diagnose:

• 1. Check backplate contacts: Remove and reseat the thermostat, ensuring it clicks firmly into place and that contact pins are clean.
• 2. Inspect wiring: Verify that low-voltage wires are secure in the backplate terminals and not damaged.
• 3. Measure supply stability: If competent, use a multimeter to monitor the supply voltage while the boiler cycles; large dips may cause reboots.
• 4. Firmware update and reset: Update to the latest firmware and perform a factory reset to clear any corrupted settings.

When to call a professional: If reboots continue with stable supply, the internal electronics are likely faulty and the thermostat should be replaced.