I have a halstead finest gold boiler,then i switch the C.H on it pressurises right up .
Could it be the exspansion vessel ,if so would it be possible to put a new one in line
It would be best to check if the old one has lost it's charge, whether the diaphragm has ruptured or the connecting pipe is blocked before doing this though.
You never know, you might just need a foot pump to fix it.
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