BoilerFaultCodesWhat the manual says
Manufacturer manualNo Heating demand from external controls 24V
What causes this fault?
This status occurs because the boiler is waiting for a signal from your external controls to start heating. It usually means your room thermostat is set too low, the programmer is in an 'off' period, or the batteries in your wireless controller have run out. While the boiler is powered and ready to go, the connection from your wall thermostat is currently telling it to stay in standby mode.
This is frequently seen during the transition into autumn when homeowners forget to replace thermostat batteries or update their timer schedules for the colder weather.
DIY fix possible
Check that your room thermostat is turned up higher than the current room temperature.Ensure your heating programmer or timer is set to 'On' or 'Auto'.Replace the batteries in your wireless thermostat if the screen is blank or showing a low battery symbol.
Avoid the next call-out bill
A cover plan would handle faults like S.36: no call-out fees, no surprise bills.
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Related fault codes
All 52 fault codes on the Flexicom hx
Seeing a different code? Every code this model can display, in one place.