Evening chaps,

I wonder if anyone can help me out.

I`ve recently been servicing and repairing boilers installed through the warmfront scheme. As you are probably aware, I am coming across a lot of ideal iasrs!!!!

Any way, I attended a breakdown call stating the boiler was making lots of noise in the middle of the night! All I could go off was the customers description of the problem as the boiler was fine when I was on site. (short spells of what sounds like overheating )
As the heating was off in the night, the noise must have been present whilst operating its DHW pre heat cycle.

I couldn`t re create this noise, and couldn`t diagnose the fault.

The day after, a warm sure engineer attended and informed the customer that he has seen loads of this problem and that its down to a spreader in the main heat exchanger!

Has anyone seen or heard of this? I cant find any info any where?

Any help would be lovely