Hi guys,
I have an ISAR HE24 Boiler in my flat that was installed 18 months ago. Since installation I have had numerous problems with the hot water (DHW) running luke warm at best, often cold. To cut a long story short the plumber has been out twice trying to fix this. Now... I'm not entirely convinced this guy knows what he's doing and can't be certain what he did to fix it as I wasn't there but the problem has returned on both occasions after a few weeks and I can't get another guy in as he is the chap sent out by the builders for the warranty, despite asking for someone else. So... I decided to try and learn the boiler and system for myself to help him.
When a hot water tap is turned on, hot water comes out for 5 seconds then it runs and remains cold/luke warm. The boiler displays (d) and the burner light illuminates as normal. After around 1 min and a few knocking noises including fluctuations in the Pressure guage on the C.H flow pipe ocour and a fault code of L9 appears (heat exchanger overheat). My best guess is the noises I hear are the diverter valve getting stuck resulting in no water passing through the heat exchanger and the subsequent overheat. Does that sound plausible? The central heating works fine although I am confused as to why the pressure guage fluctuates if it's the DHW that has a problem. What should that guage read when not in use and when in use?
Any help appreciated Thanks.....
I have an ISAR HE24 Boiler in my flat that was installed 18 months ago. Since installation I have had numerous problems with the hot water (DHW) running luke warm at best, often cold. To cut a long story short the plumber has been out twice trying to fix this. Now... I'm not entirely convinced this guy knows what he's doing and can't be certain what he did to fix it as I wasn't there but the problem has returned on both occasions after a few weeks and I can't get another guy in as he is the chap sent out by the builders for the warranty, despite asking for someone else. So... I decided to try and learn the boiler and system for myself to help him.
When a hot water tap is turned on, hot water comes out for 5 seconds then it runs and remains cold/luke warm. The boiler displays (d) and the burner light illuminates as normal. After around 1 min and a few knocking noises including fluctuations in the Pressure guage on the C.H flow pipe ocour and a fault code of L9 appears (heat exchanger overheat). My best guess is the noises I hear are the diverter valve getting stuck resulting in no water passing through the heat exchanger and the subsequent overheat. Does that sound plausible? The central heating works fine although I am confused as to why the pressure guage fluctuates if it's the DHW that has a problem. What should that guage read when not in use and when in use?
Any help appreciated Thanks.....