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yes the new harness was installed, its only started doing this since the new pcb/harness was installed. So now when the hw cuts in on the timer its almost running constantly until the timer switches it off again.....surely not right!!!

Have a Potterton Suprima 30, just replaced the pcb as it kept locking out, now working fine but when the hw is on the pump will run until up to temp, then flashing green light on boiler to indicate up to temp, pump cuts out then 2 seconds later pump cuts back in and boiler fires up again. Just...