2 months with CH issues

[Johntheo5]

You might be able to balance the rads to give more heat to the colder ones.
Even though a 5.0M head should be more than adequate for any CH system you could change the pump to speed3 which gives a 6.4M head, then adjust the ABV to say setting 0.55ish, if the system is noisy (or no improvement) then revert to speed2 and ABV to 0.45.

 

[fohnot]

You might be able to balance the rads to give more heat to the colder ones.
Even though a 5.0M head should be more than adequate for any CH system you could change the pump to speed3 which gives a 6.4M head, then adjust the ABV to say setting 0.55ish, if the system is noisy (or no improvement) then revert to speed2 and ABV to 0.45.

Thanks so much. I did this and it's been over a week now and the system is working perfectly. Even the last radiator which has never been a good behaver is toasty.

Altogether the advice on this forum has been exemplary and I'm so thankful to everyone