Digistat +3 wrong temp ?

[greencoat]

Hi all,

I've got a Drayton Digistat +3 in the livivng room, controlling the c/h.
But whatever the temp is set at, the thermostat stops the c/h about 0.7°C short of the set temp.

eg, today the temp was set at 22.5° and I watched as the c/h was running then the thermostat clicked off at 21.8°.

I know I'm probably splitting hairs, but why doesn't it just stay on demand until it reaches the set temp?

It's fairly new, about 3 mths old.

Cheers,

Pete

 

[greencoat]

Actually, it may be ok.

I just took the missus' car out for a spin, came back and presto, the room's at 22.5°. Maybe it does it in stages??

 

[moggie2002]

Not sure if the one you have does this, and while it might just be hard coded, it may have learnt that the room temp overshoots and be compensating; i.e. it might have started by switching off at the exact point, noted that the temperature kept rising by a certain amount, and be using an algorithm to back-off so that it hits the temp more accurately and saves some energy too. Smart thermostats will also learn how long it takes to get a room from one temp to another, and use that to determine when to trigger the boiler so as to reach a temperature by a certain time, as opposed simply to when start heating.

 

[bengasman]

...I know I'm probably splitting hairs, but why doesn't it just stay on demand until it reaches the set temp?...

Not probably.