I am having issues with my Sundance Tango 750 (1998). The panel is reading "OH"(overheat) with a water temperature of 80F with the pump running. The display also reads 100, which is wrong. Sometimes I see a display of "----", and other times "ICE".

I can select the 'time' button, but cannot change the time. I can select the 'filter' button, but cannot change the filter times. All other button presses result in an immediate 'LOC' message.

These all imply to me that by board is misreading the sensors and/or is locked. The controls and sensors were all working perfectly last week.

I have checked my voltage, and it's a perfect 240v, with no blown fuses on the panel. All connections are confirmed solid. I have removed and replaced the sensor connector three times with the power off.

Can anyone suggest a testing procedure for my sensors or reset procedure for my board on this issue? Does it sound like something else?

Many thanks.