boiler trouble

[pilts15]

hi there thought id try see if any1 could help with my prob, i hav a valliant 613/2e condensing boiler thats got issues with the hot water, i can get hot water if i turn the heating control up then however if i turn the heatin down the hot water temp lowers and i get no hot water.
would be great if i could get some pointers
regards dan

 

[aggis]

Is this a system boiler? Not a combi.
If it has a cylinder, fault more than likely isn't with the boiler

 

[pilts15]

i do have a cylinder in upstairs cupboard

 

[tamz]

The heating thermostat on the boiler needs to be kept above 60 deg or your water will not be hot enough. The HW cylinder can only get as hot as the water from the boiler supplying it.
The HW thermostat (if fitted) on this boiler doesn't work.

 

[diesel_ltd]

do you have motorised valves, room stat cylinder stat??

 

[Danny100uk]

This boiler is a System boiler and without the correct vaillant controls using the Ebus system the only knob that works on the boiler will be the heating knob. This is because non vaillant controls just fire up the heating and the heating only. The heating engineer will have used two zone valves or a single 3 way valve to direct the heat to either the heating or hot water. So turning the heating knob down will only allow it heat up the water to the temprature you set.

Dan