Recent content by asea

  1. A

    CH Return Temp high, but Return pipe cold?

    Sorted. Turns out the filter in the Return Pipe was completely clogged, restricting the flow back to the boiler. Quick clean and 5 minutes later, full-on heat in all radiators! Burner modulating like it should and staying on continuously!
  2. A

    CH Return Temp high, but Return pipe cold?

    Does anyone think that the symptoms I've described above, be caused by some grit or debris stuck in the Automatic Bypass? I'm trying to understand why the boiler thinks the Return Temp is higher than the Return Pipe feels??
  3. A

    CH Return Temp high, but Return pipe cold?

    Thanks all for your responses. ISO values are both open, all rads have trvs and are open on 5, lock shields are open and set for a balanced system. Only thing I'm not sure of is the comment above about the internal bypass. How do I 'throttle it back' ?? Cheers.
  4. A

    CH Return Temp high, but Return pipe cold?

    Thanks LeakyDave! Pressure is at 1.5, all radiators are bled (water is clear), and I don't believe there is a Zone v/v. Not sure about the air lock at the pump, but would I be right in saying that I wouldn't get any hot water to the radiators if that was the case? I have previously run the...
  5. A

    CH Return Temp high, but Return pipe cold?

    Hi all, I have a Vaillant EcoTec 837 that is about 4 years old. HW operation is fine. CH operation isn't. I have the CH temp set to 75º. When there is a demand for CH, the pump starts, then seconds later the burner ignites and the Flow Temp starts to rise quickly. After approx. 20-30...
See more
Back
Top