Hi, my Betacom boiler stopped working a few days ago and showed the error message F.28, I tried defrosting the condensate pipe then resetting the boiler and got the same error after about two hours. Then I took the condensate pipe out and let the boiler drip into a bucket, then reset the boiler again and got the same error. I reset it again last night and woke up this morning to a different message on the display (see attached). Any ideas would be a great help.