Hi,
Just to introduce myself, i'm a new member, but have been hovering the forum for tips and hints for years....but now I need some specific help. I have searched numerous times to find an answer to this, but no joy. I hope one of you clever chaps can assist.
Anyway, I have a loud banging coming from my heating system. It is quite a loud 'bang', which happens intermittantly whilst the boiler is running. It seems to be eminating from the cold fill pipe in the airing cupboard, and is usually accompanied with a whooshing sound. There is also a 'bubbling/gurgling' noise which can be heard from the pump around the same time. (almost as if aerated water is passing through).
The heating system is a traditional open vented Y plan system, with a Baxi Solo 15HE boiler in the kitchen. In the airing cupboard on the first floor I have a Grundfos 15-50 pump, Drayton mid position valve and hot water cylinder. The F&E tank is located in the loft.
The boiler, pump, valve and cylinder were all installed in March 2010 and all appear to be working fine. By this I mean the boiler has no fault lights and ignites, runs fine and the flow pipe gets very hot. The pump is spinning freely (setting 2), and the valve moves across and does what it should. (i.e. heating, dhw or both). I have been up in the loft watching the F&E tank during this scenario, and there is no bubbles from the fill pipe, or anything come out of the expansion pipe. Its all quite still up there, although I did notice there is quite a bit of crud in the bottom of the tank. Following advice on the forum I have also isolated the cold water supply to the tank and let water out of the system, and the level has dropped. The tank then refils satisfactorily, which I assume indicates the pipe is not blocked.
The house is a 1980's build 2 bed detatched, and I feel as though the boiler is a little undersized. Therefore during recent colder weather I have had to turn the boiler right up to nearly maximum on the temp adjustment screw to keep the house warm. (This is giving me 60deg C surface temp on the rads, which is fine for us).
However, having the temperature turned up seems to have caused the banging to get quite a bit worse. So much so it wakes us up in the morning and distubs us when watching TV on an evening.
I have bled every rad, at least 10 or 15 times, and there is no air. I have bled the pump around 10 times and again, there is no air. The thumb screw valve in the airing cupboard does seem to collect air which I release every few days, but bleeding this doesn't stop the banging.
Any ideas of what else to check....? My gut feeling based on the noises i hear is gas escaping up the fill or expansion pipe but I dont know how to test for this...?
Thanks in advance!
Matt
Just to introduce myself, i'm a new member, but have been hovering the forum for tips and hints for years....but now I need some specific help. I have searched numerous times to find an answer to this, but no joy. I hope one of you clever chaps can assist.
Anyway, I have a loud banging coming from my heating system. It is quite a loud 'bang', which happens intermittantly whilst the boiler is running. It seems to be eminating from the cold fill pipe in the airing cupboard, and is usually accompanied with a whooshing sound. There is also a 'bubbling/gurgling' noise which can be heard from the pump around the same time. (almost as if aerated water is passing through).
The heating system is a traditional open vented Y plan system, with a Baxi Solo 15HE boiler in the kitchen. In the airing cupboard on the first floor I have a Grundfos 15-50 pump, Drayton mid position valve and hot water cylinder. The F&E tank is located in the loft.
The boiler, pump, valve and cylinder were all installed in March 2010 and all appear to be working fine. By this I mean the boiler has no fault lights and ignites, runs fine and the flow pipe gets very hot. The pump is spinning freely (setting 2), and the valve moves across and does what it should. (i.e. heating, dhw or both). I have been up in the loft watching the F&E tank during this scenario, and there is no bubbles from the fill pipe, or anything come out of the expansion pipe. Its all quite still up there, although I did notice there is quite a bit of crud in the bottom of the tank. Following advice on the forum I have also isolated the cold water supply to the tank and let water out of the system, and the level has dropped. The tank then refils satisfactorily, which I assume indicates the pipe is not blocked.
The house is a 1980's build 2 bed detatched, and I feel as though the boiler is a little undersized. Therefore during recent colder weather I have had to turn the boiler right up to nearly maximum on the temp adjustment screw to keep the house warm. (This is giving me 60deg C surface temp on the rads, which is fine for us).
However, having the temperature turned up seems to have caused the banging to get quite a bit worse. So much so it wakes us up in the morning and distubs us when watching TV on an evening.
I have bled every rad, at least 10 or 15 times, and there is no air. I have bled the pump around 10 times and again, there is no air. The thumb screw valve in the airing cupboard does seem to collect air which I release every few days, but bleeding this doesn't stop the banging.
Any ideas of what else to check....? My gut feeling based on the noises i hear is gas escaping up the fill or expansion pipe but I dont know how to test for this...?
Thanks in advance!
Matt
