Advice please. Our heating system is about 14 years old and is a traditional gas heating system with radiators. For some time now we have had an overheating problem where the water sounds like it is boiling in the cylinder though when the pump switches off the boiling sound virtually stops at the same time. With regards to the noise the pump, which is in the airing cupboard, appears to get noisier the longer the heating is on but acts normally when switched to water only. When the system overheats the Baxi Solo 3PF boiler cutsout and the overheat light comes on but the pump keeps running. The system ran all through the year on water only and didn't overheat once yet as soon as we switch the heating on after 1-2 hours the boiler overheats. We have tried running the heating on it's own and with the water but either way it overheats. We had this problem a couple of years ago and our local Gas Service company who we have a contract (and actually installed the system) were called out several times but even though they replaced several parts they never completely resolved the problem and as the weather warmed up it became less of an issue. Last winter we were away a lot so it didn't really bother us but this year it's all started again.
The gas service company have recently changed their contract where they now only cover the labour so I'm obviously more concerned with what parts they change. Any advice please on what the fault could be and what they should be looking at. It's very difficult to know what they have replaced in the past as when they kept coming out a couple of years ago I was in hospital so wasn't personally involved in what they actually replaced. The only thing I know for cetain is they did, at our expense, powerflush the system.
The gas service company have recently changed their contract where they now only cover the labour so I'm obviously more concerned with what parts they change. Any advice please on what the fault could be and what they should be looking at. It's very difficult to know what they have replaced in the past as when they kept coming out a couple of years ago I was in hospital so wasn't personally involved in what they actually replaced. The only thing I know for cetain is they did, at our expense, powerflush the system.