im having a strange problem with my hot water which i feel has never been very hot. It now has developed a fault where it pulses between hot and tepid. I can see the flames rising and falling a bit. I have hoovered out all burners and jets used emry cloth on the flame sensor, checked the temp sensor which looks ok(still has elecrical contact gell on it) reduced incoming flow rate and had the gas sup checked and purged.The plate heat exchanger is a bit dirty, going to find a way of cleaning it. Hot Water seems to be more consistant if heating has been on. I am a electrian so if any one knows if components can be tested that would be better than just replacing things. But hoping some one has had simular problem and fixed it.
Thanks in advance.
Thanks in advance.