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when we put radiators on pressure falls to zero yet all rads work ok ?

we have checked for leaks but cannot find any what could it be
its a vaillant turbomax combi boiler 5 yr old
sue, October 2008
Boiler would lock out if at zero
Could be blockage in supply tube to pressure gauge giving incorrect reading

a, October 2008
link Click here to see other fixes for Vaillant.