VAILLANT 831 not reaching temp

[Coldone]

If I removed the Vaillant control…
As in just pulled it out would it need some sort of blank putting over it

 

[CBW]

If I removed the Vaillant control…
As in just pulled it out would it need some sort of blank putting over it

Yes, blanking plates are available or a time clock 150. Try factory reset for parameters

 

[Coldone]

Do I just go to d.96
Then 1

 

[CBW]

Do I just go to d.96
Then 1

Yes, iirc.

 

[Johntheo5]

Unlikely to be set to return temperature control but check it out anyhow.

 

[Coldone]

It was set to flow

 

[Coldone]

Hang on…. Just done the factory reset and it’s still running at 66 degree

 

[Coldone]

I’ll see how it is tomorrow but it’s looking promising
Thankyou for all your help
Much appreciated

 

[Coldone]

Ok….. heating is working perfectly….
Although the boiler seems to be going hot to Luke warm when it’s been on a couple of minutes
Do you think this is a faulty part or something I may have messed with in the settings
Thanks in advance

 

[CBW]

Are we talking heating or hot water?

 

[Coldone]

Hot water sorry

 

[CBW]

Could be a few things. Do you have preheat turned on?

 

[Coldone]

Iv tried it with it on and off
No difference

 

[DP]

Preheat heats the water ready for use at the tap and give boiler time to ramp up.
You will see letter ‘c’ displaying for preheat.

 

[Johntheo5]

If you just open a hot tap juust sufficient to give a moderate flow does it stay hot?, if you then open the HW tap fully does it then run hot and cold?