Air in CH System & Hot Water

[MTG]

I recently (6 weeks ago) had a new Worcester Bosch boiler installed along with new Grunfos pump and Honeywell 2-way valve. Ever since I've had terrible problems with air in one particular radiator and the towel rail that runs off the hot water system. I have to bleed these two every day and get very loud gurgling when the CH has been on for about 40 mins or more. Sometimes when the pump comes on I get a noise like trying to suck the last drops of a drink through a straw.

Any ideas on what the problem could be?
Is the pump running too high (setting 3) and drawing in air?

Any help appreciated.

 

[75pete]

I would start by checking the system Inhibiter is correct. You could fit auto vents.

 

[HootingOwl]

Feed and vent pipes not in the right place and system is pulling in air. Installation error so get installer back. Try turning pump speed down.