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Chris R Frequncey of the charge as defined by the voltage of the power source. e.g current will flow at first, then stop, and flow in the opposite direction, then stop, etc. The higher the frequency, the less likely it is that the capacitor has time to charge fully, and current can flow...

I do about 6-8 of these a week now. Why other engineers have a problem with these boilers I do not know, A simple mod to the pcb and a slight adjustment elsewhere is all that is needed. Why replace the pcb? frequancey of the resistors???? I would go more in depth but that would be telling...

Fully open both valves on the rad thats giveing you trouble (if trv take head off & make sure pin moves up & down freely). Close all other rads down on the lockshield side only - run boiler. Provided the rads bleed and both valves are fully open rad should warm up immediatly, If not you have...