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Just one point to those coming here, buy the genuine 500ma transducer only. The china 650ma ones draw more than they say and the PCB sees that as a fault (trips at 780ma). Mine was 750ma but after an hour had crawled up and tripped

So i learnt a hard lesson, new china transducer ni fix, replaced everything no fix.... then investigated transducer. My issue was 5 beeps i found was overcurrent, cheap chinese copy transducer stamped at 650ma was drawing 750 and crawled with heat to 780 at which point the PCB trips it as...

5 beeps i found was overcurrent, cheap chinese copy transducer stamped at 650ma was drawing 750 and crawled with heat to 780 at which point the PCB trips it as faulty. BUY GENUINE.