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Mend Boiler Lockout Pressure

why is my boiler going into lockout?

the pressure keeps going up very fast on my boiler and it then goes into lockout what could b causing this???

colm
February 2012
Heating, Home Heating SystemsBoiler Lockout Pressure
Could be that the pressure in the expansion vessel has dropped and needs re charging

bill
February 2012

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Boiler Lockout: High Pressure - Causes & Fixes