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when mounting a three way mid position valve does the stepper motor have to be uppermost position or can the three way valve be in any conveniant orientation. ATB Len

I have a (Gas) Potterton Prima50 B boiler which behaves 98 precent of it time, how ever very occasionally on ignition the main burner lights with a very loud whooph, the flame then appears to burn out of control (Burning in a ball of flame above the gas jets) and the boiler vibrates the whole...