Wiser thermostat: Blue flashing
The thermostat is recalibrating on the valve: the motor drives briefly to find its position. It happens after a battery change, or when you twist the cap towards minus for a few seconds.
Applies to: Wiser Radiator Thermostat. What you see: a light.
What to do
Drayton Wiser gives no step for this on the page cited; the meaning above is all it says.
Source
Drayton Wiser’s own help page, read on the date shown.
- Drayton Wiser: How to Change Batteries in Wiser's Smart Radiator Thermostat — Wiser Radiator Thermostat. wiser.draytoncontrols.co.uk Checked 2026-09-29.