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over pressure?

I have a greenstar 24i boiler, pressure is normal, when I turn heating on pressure increases and eventually operates pressure relief valve, pump is running and radiators get warm

K Hepher
May 2019
GreenstarHeating, Home Heating SystemsPressure 24i Boiler
Sounds like the expansion vessel needs attention. This would be a job for a qualified engineer, but shouldn’t be too hard or expensive to sort.

Rupert
May 2019

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