Grant boiler constantly rusty overflow, what to do?

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Hi guys

Anyone familiar with Grant oil boiler?

The boiler is consistently overflowing and the water from overflowing is rusty

I have been told that the expansion vessel is dead

I have decided to open it today and the water is completely rusty as you can see

How do l know if it’s actually the expansion vessel?

Any other advice appreciated

No heating and no hot water :(

Many thanks


Edit: I have also noticed that after turning on the boiler for 15-20 minutes, the central heating come on as well without switches the thermostat on.
is the related issue?
 

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