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Thanks for your reply, I have only pressed the reset button about 3 or 4 times and each time it pops out almost immediately to stop the burner so it seems to still be doing its job! What I need to know is why it is protecting the system from over heat when the system temp is cold (20 degrees on...

Hi, first post on here so many thanks in advance for any replies. I have recently replaced several radiators and drained the CH system to do so each time. The last time however after refilling and bleeding the air from the system the boiler will not fire up. The pump seems to run and when...