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I agree Bunnyman, your thoughts are the same as mine. I think the confusion arises when when comparing this device to a normal programmer with separate thermostat. With that setup if the timer is OFF nothing, apart from FROST override, will wake the boiler up, even if the thermostat is...

Oops, in my eagerness to quote DAN I forgot my question! If, during the MOON phase, I turn the dial to increase the displayed temperature to a value higher than the current room temperature the boiler fires up, even when the programmed timer (A4 in my case) is OFF. This appears to be some...

DIYDan74 Good stuff DIYDan74 However my understanding is that the boiler will only fire up when the Moon setting is active if the boiler is below the temp setting (standard = 5C) and not above otherwise the boiler will be on all the time. My settings are SUN=20C and Moon=5C This...