how to wire a drayton digi thermostat

[cowan7824]

hi everyone,
i have just replaced a honeywell thermostat,with a drayton digi stat.

the wiring i have done is as follows

red to com
yellow to on
blue to neutral
earth isolated with terminal block as not needed
off not used.
it seems to work untill it gets to a point when the timer on the programmer
kicks in with either the hot water function to turn on or off or the central heating to turn on or off,this then causes a 3 amp fuse to blow which protects the timer,programmer.

could it be that the off terminal i have not used should be used ????
does it require a link wire to 2 terminals, ???

can any one help
thanks :

 

[bengasman]

The colour coding is meaningless, you have to test/measure every wire.
Apart from that, it is simply a matter of following the boiler wiring diagram and that of the roomstat.