F73 FAULT CODE ON ECOTEC 624?

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f75 code was the first issue.....changed pressure sensor it was the old orange type.so changed that with the new one. filled up and testd now all i get is f73? checked sensor/cable. no break in the wires and the sensor is fine itself..... prior to changing the sensor i unblocked the rubber hoses on the flow & return 2 the heat exchanger.......system is pretty dirty. but still not to sure why im getting a f73 fault. and am going 2 change the rubber hoses 2moz but dont think this will help. im thinkin possibly there is a lot of sludge jsut before the water pressure sensor? any thouights
 
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f75 fault is displayed as when pump gets power pcb expects water pressure to change (like a pump proving device). do basics like make sure pump running correctly water clean exp vessel charged correctly pipe to expansion vessel not blocked. have you put the modified part on which involves leaving old pressure sensor in place & replacing new on just under heat exchanger with a new wiring harness or have you possibly put on an incorrect sensor (just a thought)
 
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