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Thanks guys, It was a the CH return valve not being fully open causing the overheat cut out (silly mistake). Apparently holding down the reset button for 60 seconds then over rides this cut out. Many thanks for your input, much appreciated! :D

Hi, I am a plumber (but not a boiler engineer) and have installed a Greenstar Heatslave 25/32 oil fired boiler in a property in France. After a couple of lockouts due to air in the oil (dual pipe) feed, the boiler worked fine for about 15 mins and had just started to heat the pipes when it...