Valliant boiler in summer mode - no hot water

[skyhawker]

So will having taken off Summer Mode sort the issue?

 

[Steelmasons]

Does the heating come on when called for via the programmer/room stat?
If so then the problem is either motorised valve/programmer/cyl stat/overheat cutout tripped on unvented cylinder (if fitted).

 

[skyhawker]

Does the heating come on when called for via the programmer/room stat?
If so then the problem is either motorised valve/programmer/cyl stat/overheat cutout tripped on unvented cylinder (if fitted).

Thanks.

Are any of these likely to have been caused by service engineer? Was all working fine prior to service.

 

[Steelmasons]

Do you mean 'comfort mode' as opposed to 'summer mode'?

 

[skyhawker]

Do you mean 'comfort mode' as opposed to 'summer mode'?

No, service engineer put it into summer mode. As I have thermostat control I put it back to 70c (advised by Crofton earlier on in thread).

 

[Steelmasons]

So the boiler utilises a VRT controller?

 

[skyhawker]

So the boiler utilises a VRT controller?

Boiler is controlled by a Horstmann H37xl timer. Hot water is on time mode, and 2 zone central heatings are set to On all day because they are controlled seperately by Honeywell C907. I know over kill...

 

[aptsys]

Photos would be a great help to avoid any confusion

 

[Bunnyman]

As its a system boiler only one part of the pcb works. Press button under hw symbol use + bring up to 65c press ok. Then do the same under the heating radiator symbol. It will be controlled via your clocks and stats. Leave everything else alone. Your engineer probably got confused as the 637 system boiler uses same pcb and contrrols as the 830 combis

 

[Steelmasons]

Hey Bunny , I've not come across 'summer mode' on a 6 series boiler or 8 series boiler unless a VRT controller is fitted.

 

[skyhawker]

As its a system boiler only one part of the pcb works. Press button under hw symbol use + bring up to 65c press ok. Then do the same under the heating radiator symbol. It will be controlled via your clocks and stats. Leave everything else alone. Your engineer probably got confused as the 637 system boiler uses same pcb and contrrols as the 830 combis

The problem is that there is no HW symbol. Only heating.

 

[skyhawker]

Hey Bunny , I've not come across 'summer mode' on a 6 series boiler or 8 series boiler unless a VRT controller is fitted.

If I press the heating button and set it to 0, an umbrella icon comes up which is the Summer mode symbol
https://www.vaillant.co.uk/downloads/ecotec-plus-user-manual-261421.pdf

 

[Bunnyman]

I think they mean the comfort(warmstart) steel, they sound a bit confused. If they switch the ch off on the stsytem boiler with standard controls, nothing will work. The hw setting does nothing

 

[Bunnyman]

Ahhhh please listen buddy were going round in circles,,,, UNLESS YOU HAVE VAILLANT CONTROLS THE HW STAT DOES NOTHING!!! Your whole system is controlled through the ch stat... whether its hot water or heating... just turn it up an let ur external controls do their stuff

 

[Crofton Gas]

Ahhhh please listen buddy were going round in circles,,,, UNLESS YOU HAVE VAILLANT CONTROLS THE HW STAT DOES NOTHING!!! Your whole system is controlled through the ch stat... whether its hot water or heating... just turn it up an let ur external controls do their stuff

That was my original suggestion