We just noticed that the house is getting really chilly.
The boiler seems to be working.
Hot water is still hot.
The circulation pump is making noises.
The flow and return pipes are really hot. We have two circuits, upstairs and
downstairs, with one pump. The downstairs flow and return are both really
hot but the radiators are stone cold. The flow and return to upstairs are a
bit less hot, and the return is a bit cooler than the flow. The upstairs
radiators are slightly warm at the top of the radiators, cold at the bottom.
My thought is that we need a new pump, and the upstairs radiators are just
warmish because the hot water is rising. But I don't see why the pump is
making working noises and vibrating?
Any alternative explanations, please or tests I should carry out?
Thanks in advance.
- posted 9 years ago