I have a Worcester Bosch Greenstar 30 CDi boiler, about four years old.
I've noticed that it is giving out an almost constant hum. I think it's the circulating pump. This is even the case when, as now, the central heating has been turned off for the summer (I did this on the boiler console, not just at the room stat).
Is this normal? If not, any ideas what might be going on?
I've noticed that it is giving out an almost constant hum. I think it's the circulating pump. This is even the case when, as now, the central heating has been turned off for the summer (I did this on the boiler console, not just at the room stat).
Is this normal? If not, any ideas what might be going on?