BoilerFaultCodesWhat the manual says
Manufacturer manualNo Heating demand from external controls 230V
What causes this fault?
This code appears when the boiler is ready to provide heat but hasn't received an electrical signal from your thermostat or timer to do so. The most common cause is that your house is already up to the desired temperature, or your heating programmer is currently in an 'off' period. It can also happen if your thermostat has run out of batteries and can no longer send a signal to the boiler.
DIY fix possible
Check that your room thermostat is turned up higher than the current room temperature.Ensure your heating programmer or app is set to 'On' or 'Auto'.Replace the batteries in your wireless room thermostat if the screen is blank or showing a low battery icon.
Avoid the next call-out bill
A cover plan would handle faults like S.30: no call-out fees, no surprise bills.
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