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Just noticed that the green light flashes when the hot water is on prior to the F4, is this normal?

Thanks Chris. Shouldn't be too hard, happens every time we have a shower now. Problem getting worse. Going to ring Glow Worm today as still under warranty.

Hi again, After your spot on advice re my F14 error code.... Boiler has now taken to switching off with a code of F4. Manual says boiler went off while lit. Reboot the boiler and it works well for a while, them same again. Could this be another gunk in the system issue or is this an issue...

Hi again, Boiler has now taken to switching off with a code of F4. Manual says boiler went off while lit. Reboot the boiler and it works well for a while, them same again. Could this be another gunk in the system issue or is this an issue for Glowworm? Making me think about our new...

Amusingly, the installer called today saying he had spoken to Glow-Worm and it was likely to be a blockage which they could charge to fix! So now he has decided to come and do it himself. Looks like there are people who know about boilers and those who know just how to install boilers.

Thanks just worked it out from the schematic. Switch on HW, diverter valve sends radiator water through Plate to Plate HX and this heats up the HW. Turning down HW temperature lessens the problem which makes sense. Installer is convinced that it is a fault and has called Glow-Worm wouldn't...

Sorry for being thick but why would a heat exchanger issue just effect the HW and not effect the CH as well?

Don't worry, just discovered pressure drop off was due to a leaky radiator. Looks like it may just be a blocked hx.

Thanks. When you say that the heat exchanger is blocked, I assume this is not related to the 3 bar issue but to do with a lack of proper flushing in the first place. Does this mean that the drop off in pressure in the boiler is a different issue, perhaps related to the 3 bar problem and a...

Hi, I have just had a Glow-worm 38CXi installed in my flat. Nice bit of kit apart from alot of pluming. All was well for a week or so until I noticed the pressure was up to 3 bar. I checked and I noticed the fill tap was open. I closed this and the guy installing my kitchen released some...