Hi there,
I've been reading various posts but cannot find the answer to what is driving me nuts.
When the hot water comes on, you can hear what sounds like air working it's way round the hot water cylinder and round the system and when it reaches the pump, the pump makes a god aweful grinding loud noise for a few seconds and then goes away, usually coming back after a while. I've got hot water, all taps work fine with no air splutter, all the radiators are nice and toasty, timers for heating and water work well and come on and go off as expected. I've tried bleeding the radiators, the taps, the radiator connected to the hot water, but cannot get this noise to disappear.
I can't pinpoint when this started to occur, think it's been for a couple of years probably, biut seems to be worse since I've been messing about with it. I've had radiators off for painting and recently replaced the mid position valve as the washer in it had perished causing the heating to be on when the water was being heated.. I'm guessing I've got some air still trapped but cannot find a way to extract it. I''ve bled the radiators, opened the big screw on the pump (get a trickle of water and not sure if it should pour out?) Oh, the noise only happens on the hot water, not if the central heating is the only thing on. Changing the speed of the pump didn't help really. Set to 3, it is loud, 2 it's a bit quieter, 1 makes it far more frequent.
The house was built in 1990, the boiler is a Potterton Neater heat 35e, the pump is a grundfos one, the mid position valve and the stat in the hall is Drayton and the stat round the cylinder is a honeywell.Looks like the honeywell stat was changed at some point, I've been here 4.5 years but there are fitting instructions in the airing cupboard, I replaced the mid position valve like for like. In the loft there is the water tank with the smaller header tank, each has what I beleive to be a vent pipe, the main tank has it coming from the water cylinder, the smaller tank from next to the grundfos pump. If I'm correct from what I've read, this would make the system an indirect open vented type.
Any experience on how to fix this would be welcomed. I can provide any other info if I've missed anything out.
Pete
I've been reading various posts but cannot find the answer to what is driving me nuts.
When the hot water comes on, you can hear what sounds like air working it's way round the hot water cylinder and round the system and when it reaches the pump, the pump makes a god aweful grinding loud noise for a few seconds and then goes away, usually coming back after a while. I've got hot water, all taps work fine with no air splutter, all the radiators are nice and toasty, timers for heating and water work well and come on and go off as expected. I've tried bleeding the radiators, the taps, the radiator connected to the hot water, but cannot get this noise to disappear.
I can't pinpoint when this started to occur, think it's been for a couple of years probably, biut seems to be worse since I've been messing about with it. I've had radiators off for painting and recently replaced the mid position valve as the washer in it had perished causing the heating to be on when the water was being heated.. I'm guessing I've got some air still trapped but cannot find a way to extract it. I''ve bled the radiators, opened the big screw on the pump (get a trickle of water and not sure if it should pour out?) Oh, the noise only happens on the hot water, not if the central heating is the only thing on. Changing the speed of the pump didn't help really. Set to 3, it is loud, 2 it's a bit quieter, 1 makes it far more frequent.
The house was built in 1990, the boiler is a Potterton Neater heat 35e, the pump is a grundfos one, the mid position valve and the stat in the hall is Drayton and the stat round the cylinder is a honeywell.Looks like the honeywell stat was changed at some point, I've been here 4.5 years but there are fitting instructions in the airing cupboard, I replaced the mid position valve like for like. In the loft there is the water tank with the smaller header tank, each has what I beleive to be a vent pipe, the main tank has it coming from the water cylinder, the smaller tank from next to the grundfos pump. If I'm correct from what I've read, this would make the system an indirect open vented type.
Any experience on how to fix this would be welcomed. I can provide any other info if I've missed anything out.
Pete
