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Sundance 850 series blank display (watchdog fault) — driving me bonkers


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Second owner on this year 2000 Sundance Altamar, first real problem excluding circ pump, removing air pump and ozonator that failed and some hair on the flow sensor.

Got the blank screen, sometimes has a few dashes but now blank. Operating the tub manually via the circuit breaker with the heater and circ pump fed directly and always on.

At 104 degrees my sensors are :

     16,900 ohms on temp sensor (New)

      19,200 ohms on hi/limit sensor after manually running the circ pump 

     flow sensor operation confirmed good

 

See attachment re: transformer test, 5 tests passed but the last test (blue 2 to yellow 2 at 17.9 volts is fail).

 

I ran the old temp sensor into the hi/limit circuit but still faulted.

 

Is this a simple bad transformer diagnosis or do I need to reevaluate my methods? Also, where can I get some box end wire terminals for these sensor lines?

 

Any insights will be greatly appreciated

Ken

 

 

 

 

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