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HOW TO FIX GLOW-WORM 75E!!!!!!!!!!?

my Glow-worm swiftflow 75e,
when i put the heating on the pressure keeps going up and i have to turn it off after about 15mins,does anyone know what the problem could be and would it be costly to fix,thankyou
j helliwell, September 2008
Wot is the pressure of the C/H exspantion tank on the 75e

NEED HELP, September 2008
the boiler is fitted with an expansion vessel and if it looses its charge the pressure will rise with the temperature, this can sometimes be repaired by using a foot pump to re charge the vessel, failing that a new expansion vessel should be fitted

corgi eng., September 2008
expansion vessel

iain, September 2008
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