potterton suprima 50 amber light flashing

OK Tony, I will do a test by connecting pump to a socket.

do I need to swicth the HW or CH on to test if it can turns ? it does not make bussing noise when the amber light flashes.
 
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just an update:

Before trying to test the pump, I tried the reset button, the boiler fired up and was working for a few hours. however it now locks up again. the reset does not seem to work properly.

it seems to me the pump is working. could it be boiler or PCB is faulty?

still appreciate for further advice.

many thanks
 

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