Pool and Spa
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Have you tried holding the "icon" button down for 5 seconds? This resets any watchdog error which is what the 4 dashes are.
This error is usually either a bad boot up by the spa (power interrupt etc). You have already tried to turn off and wait 2 minutes then back on I am sure. Next it could be a dirty filter (is filter over 2 years old?) or obstruction causing an over heat situation. However this usually takes a minute or two to throw the watchdog error up. Next is the temp sensor.... what you need to do is stand at the tub while someone puts the power on. There may be an error code (SN etc.) that shows briefly before the temp numbers show and then it goes to watchdog error. This will give you a clue to what sensor may be bad. And last is a bad capacitor on a circuit board. The capacitors on the board look like batteries and should be flat on the end. If they are not flat on end and look bulged, they are bad. I know your board is new but a mistake I have had before is D1 to send me the wrong board. You HAVE to order a circuit board by the white label number that is on it. If it is the wrong circuit board you would also have the watchdog go off. Compare the numbers on the old board and the new from the white label that is ON the circuit board. I hope this gives some insight on this problem and helps.