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The 3 port valve on my heating/hot water system has burnt out, the main boiler CB trips out. If i disconnect all the electrical connections to the valve will the system be useable by manually switching the valve? TIA Bob

Hi, looking for some help with the above problem. I have replaced the motor brushes, which were worn right down, I was careful to put the new ones in the same way round as the old ones came out, but I still have the same problem. All help gratefully received. Thanks Bob