Quizzes & Puzzles3 mins ago
Noisy central heating boiler
3 Answers
I have an old Servowarm central heating boiler that makes a very loud rumbling noise for at least 30 seconds every time it is switched ON. After the 30 seconds the noise dissapears and the system runs O.K. I have bled all the radiators but the problem still persits. Can anyone help?
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