I have a sealed central heating system with 1 pump. When the heating comes on the pump starts but the pump continues even when the heating is off.
I expect a little overrun, I understand this is to keep circulating the water until it cools down?… but on my system the pump goes on and on… all through the night. It is driving me crazy to the point I switch the heating off at the mains every night just so I can sleep!!!
This never used to be the case… in the past the pump would run for a short while after the heating goes off then stop running. What is happening, why does the pump keep running?
Well it’s suppose to keep running even when your boiler is off. All night ? well if you need heat, then yes. Try turning the thermostat down low and see if it still runs.
However these pumps don’t make much noise at all. Even if you’re standing right next to it they can be hard to tell if they are even working. You could have lots of air and thats what you’re hearing.
Do you hear water running through your heaters / pipes ?
also know what type of pump you have would be helpful. Can you take a picture and email to me. firstname.lastname@example.org