BoilerFaultCodesTechnical description
Additional controls not calling for heat
What causes this fault?
This status occurs when the boiler is powered and ready to fire, but it hasn't received a signal from your external controls to start heating. The most common reason is that your wall thermostat is set too low, your timer is in an 'off' period, or the batteries in your wireless controller have run out.
This is frequently reported during the first cold spell of autumn when homeowners forget to switch their programmers from 'Summer' to 'Winter' mode or find their thermostat batteries have died over the warmer months.
DIY fix possible
Check that your wall thermostat is turned up higher than the current room temperature.Ensure your programmer or heating timer is set to 'ON' or 'Auto'.Replace the batteries in your wireless room thermostat if the screen is blank or fading.