Just had a new secondary heat exchanger fitted. On its first big burn, the boiler hisses after about 10 mins of not hissing. It lasts a couple of mintes only and sounds a bit like a kettle when it hisses during heating process. It is nt very loud but noticeable! It does not recur. Any ideas why it is doing this?
Hissing inside Potterton 28
- Thread starter Brit45
- Start date
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