I previously posted a couple of years ago - Thread 'Help please! Issues with Central heating & Hot water' Help please! Issues with Central heating & Hot water | Central Heating Forum | Plumbers Forums - https://www.plumberstalk.net/threads/help-please-issues-with-central-heating-hot-water.128693/
2 years later and I am back. To cut a very long story short, it all sorted itself after the above thread. However, back in November it started to play up again. The heating would come on and the pump would be silent (on PP1) but a few hours in it then started to make a noise like a whirring sound in the pump. If I hear that noise I know the boiler stops. The heating cools. Just before Xmas I managed to sort it. Valve 1 fully closed and valve 2 just open (see photo). Heating worked fine for 4 weeks on PP1 but when the Hot Water came on the timer there would be a banging in the pipe every 90 seconds which was a pain in the middle of the night. A week ago I changed to CP1 and it was fine with both hot water silent and heating great but in the last 2 days that whirring noise starts after a few hours of the heating being on and the boiler stops. One of the videos I have attached shows you the noise while the other video shows it when it is almost silent and everything works. Sometime I can press the button and put the pump on CC1 and then repress so it goes to CP1 and the noise stops but not anymore. Any ideas? When the pump is quiet the heating works perfectly. All rads across the house nice and hot. All rads are balanced and have been bled. It seems that the whirring noise starts more often than not when the boiler restarts when the temp is below thermostat temp. It restarts and the noise begins. It can also happend the second the heating comes on. At that point, I switch it off, put the hot water on and if the pump is silent I can then switch the heating back on and it will be fine. Until the whirring starts and the boiler stops. It is doing my head in.
2 years later and I am back. To cut a very long story short, it all sorted itself after the above thread. However, back in November it started to play up again. The heating would come on and the pump would be silent (on PP1) but a few hours in it then started to make a noise like a whirring sound in the pump. If I hear that noise I know the boiler stops. The heating cools. Just before Xmas I managed to sort it. Valve 1 fully closed and valve 2 just open (see photo). Heating worked fine for 4 weeks on PP1 but when the Hot Water came on the timer there would be a banging in the pipe every 90 seconds which was a pain in the middle of the night. A week ago I changed to CP1 and it was fine with both hot water silent and heating great but in the last 2 days that whirring noise starts after a few hours of the heating being on and the boiler stops. One of the videos I have attached shows you the noise while the other video shows it when it is almost silent and everything works. Sometime I can press the button and put the pump on CC1 and then repress so it goes to CP1 and the noise stops but not anymore. Any ideas? When the pump is quiet the heating works perfectly. All rads across the house nice and hot. All rads are balanced and have been bled. It seems that the whirring noise starts more often than not when the boiler restarts when the temp is below thermostat temp. It restarts and the noise begins. It can also happend the second the heating comes on. At that point, I switch it off, put the hot water on and if the pump is silent I can then switch the heating back on and it will be fine. Until the whirring starts and the boiler stops. It is doing my head in.
