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I have a Powermax 155 boiler in my house. From new, and 10 years old this year. Of late, it had started whistling extremely loudly just after firing up from cold, first thing in the morning. It wouldn't do it after that first initial start up. Thing is, at 5am it got to the point where I...

Hi, I hope someone out there can give me some help...! I have a 7 year old Powermax 155 which is the original from when the house was built. We are the only occupants. It has so far, touch wood, behaved itself, although it has never been serviced since installation. It has always started the day...