S
SADRA
While doing an annual service on my 6 year old boiler the engineer advised me that 2 of the 3 screws at the rear of the cover of the burner had snapped due to corrosion, he then shut the boiler down leaving us with no hot water or heating. He also advised me that the whole heat exchanger unit would need to be replaced at a cost of around £700.00 as he cannot seal it, and as this may be uneconomic for the company they may decide not to replace it and just cancel my home care contract. My question is: are these screws prone to corrosion? As the top is ceramic and I would think that such screws would be either galvanised or coated to prevent corrosion. Any advise would be helpful.