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    Potterton Suprima 100 yellow flashing light but no ignition

    I have a Potterton Suprima 100 boiler which had a new PCB a few years back (the new style PCB with the black exposed reset button). It is a pressurised system with Megaflow cylinder. UPDATE The boiler has the 'calling for heat' yellow flashing light but nothing happens - maybe for 2 hours -...
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