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Also just to add it fired up again and while fired up the values are D40 = 70 D41 = 61 D71= 75 degrees

Hi Johntheo5 so i fired up the boiler again last night but was not in time to capture the values at the start however i let the boiler run and it then stopped again 10 mins later, the values I captured where after 5 mins of it being off were D40 = 54 D41 = 51 Does that sound right? Thank you.

Thanks I will do that this evening and come back to this thread. Thank you kindly so far for your support.

Thanks Johntheo5 for the reply, so after research ive found how to get into the D menu, a boiler was set to 24KW i changed it to AUTO but didnt see a difference, you think if i lower the value as you said to 18 or 20 it may behave differently?

Hello all, Im wondering if you can help? Ive got a Vaillant Ecotech Pro 28 which was installed 9 years back and has worked like a dream all its life, however this Autumn I've unfortunately started to face issues with it. I've noticed that its taking 10-15 mins for the CH to kick in when...