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Alas the fix appears only temporary CH has stopped twice today Once came back on when I switched it off and on again via the thermostat Second time this has not worked and neither has switching off the mains How do I confirm the issue is the thermostat?

Thanks I tried both buttons but no response Went back to basics and turned the mains power off for 5 mins Seems to be working fine again now

does it matter which override button?

We are experiencing an intermittent fault with our central heating We have a Worcester Bosch Highflow 400 controlled by a Drayton RF2 (both around 10 years old) The Drayton thermostat and receiver are communicating but the boiler is not responding The heating light on the Drayton SCR...