Anyone had any problems with classic heat exchangers blocking up inside? It's about 10 years old, model before the one with the red/blue sensors that fail. It's cycling on and off and the rads don't really get up to temperature and there's a gargling noise from the boiler when the pump is on. It's got 28mm circs with 22mm hot water and 10mm manifolds for the rads. I don't suspect the manifolds are blocked because the boiler still cycles and makes the noise when on hot water. I've had fernox F3 in for 2 weeks then did a mains flush (made no difference) removed the heat ex completely and checked there wasn't a blockage at the flow/return connections. None of the pipework that's visible is magnetic so i'm a bit stuck now! I've not tried a sensor yet as the heat exchanger get's really hot at the flow connection before the burner cuts out. Other than take up the floors to check the pipes or replacing the heat exchanger completely i'm not sure.
I've applied to join the CC but not got a response yet so though't i'd give it a go one here. Any suggestions would be muchly appreciated!
I've applied to join the CC but not got a response yet so though't i'd give it a go one here. Any suggestions would be muchly appreciated!