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Hi there A friend has asked me what could be wong with his boiler over the telephone. He has a Glowworm Micron 50, apparently he had a leak on a lockshield valve, a housing association plumber arrived and drained the system and then declared that he needed a part and left. 10 days later...

Can anyone tell me if I am legally allowed to install a Main Multiflow Water Heater, I am not yet Corgi registered but I am competent and I know that it will take me only a few hours to replace the existing Main Mersey Super. ????????????

Having just replaced 3 rads/rad valves and trv\\\'s, I then set about firing up the boiler which was working fine before. The correct led\\\'s came on, the boiler fired for 5 seconds and then shut down followed by a flickering power led. What have I done wrong...? Any advice would be very much...