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glow worm micron 50ff runs cont?

my micron 50ff will not switch off unless you turn the control knob to off or switch the power off could this be a pcb fault?
jamie, March 2008
found problem was zone valve stuck in on position and sending 230 volts supply to boiler

jamie, March 2008
link Click here to see other fixes for Glow-worm Micron 50FF.