I have started getting strange noises from my hot water tank cupboard, which I think are coming from the pump.
The system is a standard "open vented" (correct name?) type - gas boiler in the kitchen, hot water tank upstairs, cold tank and feed/expansion tank in the loft.
Only had the house a couple of weeks, heating seems to be working fine. Everything is on an old mechanical timer. I have turned the central heating "off" by setting a wall-mounted thermostat to zero, doesn't seem to be another control. Hot water is working bar the noise.
What I have done which I think has caused the problem: Removed a radiator for decorating, by closing both valves.
Everything sounds normal then occasionally there is a sudden "whoosh" sound followed by gurgling. Sounds a bit like flushing a toilet. This is pretty loud, enough to wake me up anyway...
I looked in the loft - cold tank has plenty of water, ball cock is a little "lazy" (dribbling) but does shut off. Feed/expansion tank has water, and ball cock seems fine.
Googling my guess is air in the pump? Does this sound likely? It's a Grundfos 15-50. Should I try to vent it? I understand I do this by turning the big screw on the end - do I do this with the system on or off? (sorry if stupid question, complete newbie) Does anyone know whether I turn clockwise/anti-clockwise? (I had a go but it seems very stiff both ways, and is not very accessible...)
The system is a standard "open vented" (correct name?) type - gas boiler in the kitchen, hot water tank upstairs, cold tank and feed/expansion tank in the loft.
Only had the house a couple of weeks, heating seems to be working fine. Everything is on an old mechanical timer. I have turned the central heating "off" by setting a wall-mounted thermostat to zero, doesn't seem to be another control. Hot water is working bar the noise.
What I have done which I think has caused the problem: Removed a radiator for decorating, by closing both valves.
Everything sounds normal then occasionally there is a sudden "whoosh" sound followed by gurgling. Sounds a bit like flushing a toilet. This is pretty loud, enough to wake me up anyway...
I looked in the loft - cold tank has plenty of water, ball cock is a little "lazy" (dribbling) but does shut off. Feed/expansion tank has water, and ball cock seems fine.
Googling my guess is air in the pump? Does this sound likely? It's a Grundfos 15-50. Should I try to vent it? I understand I do this by turning the big screw on the end - do I do this with the system on or off? (sorry if stupid question, complete newbie) Does anyone know whether I turn clockwise/anti-clockwise? (I had a go but it seems very stiff both ways, and is not very accessible...)