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Hi hoping someone can help. A radiator got knocked off its hanger around christmas time so had to drain down the system to repair pipework. At the time i put some system cleaner in and decided to drain it down today. On fillilng had a lot of problem with an airlock however system is now full again. Problem I have now is that as soon as the power is switched on the boiler and pump are running even with the prorammer switched off. System is a Grant oil fired burner with a midport valve for CH and HW. Any advice would be really welcome so thanks in advance...