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vaillant VUW 242e locked out?

as soon as boiler is switched on it goes to lock out immediately, pump runs, green light on, orange heating demand light on - checked everything, there is continuity across overheat stat, gas is present, water pressure ok, changed PCB - worked for about a day and gone back to same fault

G.S.
January 2013
VaillantHeating, Home Heating SystemsVaillant Vuw 242e Out
What about fan if it's not nothing will work

ltd
January 2013

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