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Mend Vaillant VUW 242e Boiler Pcb Lockout

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
VaillantVaillant VUW 242eHeating, Home Heating SystemsBoiler Pcb Lockout
What about fan if it's not nothing will work

ltd
January 2013

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Vaillant VUW 242e Lockout Fault - Help & Advice