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seems baffling although Iv just had a shower and the hot water stayed constant now the dual Is turned down a little 50 degrees

D.40 = 58 D.41 = 50

True…. Although I’m close to changing the full boiler with everything that’s gone on with it recently

That’s interesting The plate heat exchanger has been off and cleaned May be worth replacing

Yes

If I turn the gauge down to 50 it does seem to hold its temperature better

Ok so canoe filter seems fine when the hot water is run the display goes up to about 60 then comes back down with the flame still on It goes all the way down to 41 Then it flicks between 70 and the water temp eg 39 If I press I s.53 is shown

Thanks I’ll give it a try tomorrow

It seems to stay hot with the tap half open But Iv not run it for long

Iv tried it with it on and off No difference

Hot water sorry

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

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

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

It was set to flow

Do I just go to d.96 Then 1

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

Yes there must have been a Vaillant control at control at some point as the receiver was plugged into the front I have tried with it in and with it not in and no difference

D71 is 70

So there is no d.71