BoilerFaultCodesWhat the manual says
Manufacturer manualNo heat demand: Controller (Room thermostat (RT) is blocking heating mode)
What causes this fault?
This status code appears when the electrical connection between the boiler and your thermostat is broken, signalizing that no heat is currently needed. It most commonly occurs because your home has reached the desired temperature or your heating schedule has timed out. In some cases, it can be triggered by flat batteries in a wireless thermostat or a loose wiring connection at the control box.
DIY fix possible
Check if your room thermostat is set lower than the current room temperature.Replace the batteries in your wireless thermostat or programmer.Ensure your heating timer or app is set to an 'On' period.
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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