No heating but hot water fine Honeywell programmer?

[Andagain1001]

Hello everyone
I'm hoping someone will be able to tell me if my programmer or something else is at fault...

Woke up this morning and radiators cold. Boiler and h/w working ok. Checked programmer (Honeywell ST9400C) and the heating had somehow turned itself off overnight.
When I press the heating mode button I hear a very soft click, however when I press the h/w mode button I hear a louder click.
Could this mean that the switch has had it? Or could it be a problem elsewhere eg 2 port motorised valve faulty? (The valve head was replaced a month or so ago and everything has been fine since then).
Is there any way I can check to see which it may be, or anything else?

Thanks for any opinions in advance
Andy

 

[Andagain1001]

Oops just realised there was an error in my post. Have edited so hopefully it makes more sense!

 

[Andagain1001]

Afternoon all
Have been playing with the buttons on the programmer and if I turn the hw to off and the heating to on, the heating works!!
I've also been reading that sometimes hw and heating together can be a problem with the Honeywell ST9400C so this may well be it.
Anyone know if I leave it so the hw and ch don't cone on together it will keep going, or is it time for a new programmer?
Many thanks