Help!
Any comments would be greatly appreciated.
My central heating has the following problem:-
-When only the heating is calling for heat, the mid position valve directs the water to the heating, all works well, no noise, warm rads, great.
-When heating and water are calling for heat, mid position valve sits in the middle, all works well, slight amount of noise in the pump area, like tiny bubbles of air, but seems to cause no problem.
-When only the water is calling for heat, the mid position valve directs the water into the coil in the cylinder, all sorts of horrendous air noises, like huge bubbles going through, occasionally the pump sounds dry momentarily. After this happens 2 or 3 times there is a terrific noise as the air rushes back up the pipes and up the vent!!!
I have descaled and flushed the system recently (problem was occurring before this) and added Inhibitor. The header tank has about 4 to 5 " head of water. The vent pipe curves over about 12" above the header tank.
Any ideas, please!!!
Any comments would be greatly appreciated.
My central heating has the following problem:-
-When only the heating is calling for heat, the mid position valve directs the water to the heating, all works well, no noise, warm rads, great.
-When heating and water are calling for heat, mid position valve sits in the middle, all works well, slight amount of noise in the pump area, like tiny bubbles of air, but seems to cause no problem.
-When only the water is calling for heat, the mid position valve directs the water into the coil in the cylinder, all sorts of horrendous air noises, like huge bubbles going through, occasionally the pump sounds dry momentarily. After this happens 2 or 3 times there is a terrific noise as the air rushes back up the pipes and up the vent!!!
I have descaled and flushed the system recently (problem was occurring before this) and added Inhibitor. The header tank has about 4 to 5 " head of water. The vent pipe curves over about 12" above the header tank.
Any ideas, please!!!