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I have worked out for myself now what must be happening. When the first on time of the day is hit the unit goes in to bang-bang mode for a maximum of 2 hours. Then it goes into PID mode. This is gives the quickest warm up to the set point and for a normal house will result in no oddities due to...

Temperature profile from room controlled by a Drayton Digistat 3+

I think the algorithm is very strange. Must admit I am using the thermostat in an unusual way - to control an industrial hot air heater - but the previous model worked fine. This one is very odd. Comes on at 6:30 am and rockets up to 19.5 deg in a couple of hours but then slows right down. For...