Update:
Had a plumber out this morning and he is convinced that it is an airlock
He tried to force it out. However he didn't have any luck
He wants to fit an automatic air vent to the system, but he isn't sure where the ideal place to fit it will be.
He admitted that he thought that this would be a small/quick job. However he now feels that the flooring and floor boards needs to come up.
Had a plumber out this morning and he is convinced that it is an airlock
He tried to force it out. However he didn't have any luck
He wants to fit an automatic air vent to the system, but he isn't sure where the ideal place to fit it will be.
He admitted that he thought that this would be a small/quick job. However he now feels that the flooring and floor boards needs to come up.