- 7 Nov 2018
- Reaction score
Pump runs, hot water going into central heating pipe, first 3 rads getting hot water but last 3 rads warm at the inlet but rads cold. Hot water is working ok. when the heating is on pump is running but only about an eighth of a bar increase in pressure. I'm thinking that there is not enough pressure to push the water around all the rads.If there was a blockage wouldn't the pressure rise? It seems to me that the pump impeller is damaged in some way. Do these wear out? or could there be air in the pump reducing efficiency? Can i just change the pump head or impeller without taking any pipes off as it looks quite difficult to get to the pipes? Its an Alpha pump. Its already set at 3 so i can't increase it anymore to check it. I don't know if this is a common problem with these or not. Any help would be appreciated.