Noob boiler symbol question

Soldato
Joined
29 Mar 2007
Posts
4,068
Location
Manchester
I am now officially a homeowner (wohoo!) and as such I have a ever growing to-do list of jobs, things to buy and things to learn.

This should be a very easy one. I have a Vaillant boiler and it has three mode symbols. One sun, one kind of half moon thing, and one timer.

I'm guessing:
Sun = summer mode = heating is completely off?
Half moon thing = winter mode = heating on all the time?
Timer = timer.. pretty obvious.

So, am I right on the summer/winter mode meanings? It has a temperature control and separate on/off switch which confuses me. Specifically, why do I need a summer mode i.e. off if I can just switch it 'off'?
 
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