Valliant boiler in summer mode - no hot water

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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).
 
Steelmasons said:
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).
Click to expand...

Thanks.

Are any of these likely to have been caused by service engineer? Was all working fine prior to service.
 
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Steelmasons said:
So the boiler utilises a VRT controller?
Click to expand...

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...
 
Photos would be a great help to avoid any confusion
 
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
 
Hey Bunny , I've not come across 'summer mode' on a 6 series boiler or 8 series boiler unless a VRT controller is fitted.
 
Bunnyman said:
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
Click to expand...

The problem is that there is no HW symbol. Only heating.
 
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
 
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
 
Bunnyman said:
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
Click to expand...

That was my original suggestion :)
 
D

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