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Many thanks for your prompt reply, I will give that a try!

Hi, I hope someone can help with a question on my BG Glow Worm 330 please. I have drained CH system to fit TRVs and lockshields, fired the boiler up after refilling and bleeding system and got Fault code F5. From this I then reset the switch on the Overheat Thermostat (as per a previous post)...